Nanosized Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> with high surface area as polysulfide capturer combined with graphene for Li–S battery cathode
Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has be...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Zhang, Hang [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2019transfer abstract |
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| Umfang: |
9 |
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| Übergeordnetes Werk: |
Enthalten in: Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch - Zhang, Lei ELSEVIER, 2018, the journal of the International Society of Electrochemistry (ISE), New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:319 ; year:2019 ; day:1 ; month:10 ; pages:472-480 ; extent:9 |
| Links: |
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| DOI / URN: |
10.1016/j.electacta.2019.07.023 |
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ELV047578947 |
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| 520 | |a Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. | ||
| 520 | |a Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. | ||
| 650 | 7 | |a Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> |2 Elsevier | |
| 650 | 7 | |a Graphene |2 Elsevier | |
| 650 | 7 | |a Cathode |2 Elsevier | |
| 650 | 7 | |a Lithium-sulfur batteries |2 Elsevier | |
| 650 | 7 | |a Polysulfides |2 Elsevier | |
| 700 | 1 | |a Gao, Qiuming |4 oth | |
| 700 | 1 | |a Tian, Xuehui |4 oth | |
| 700 | 1 | |a Li, Zeyu |4 oth | |
| 700 | 1 | |a Xu, Peng |4 oth | |
| 700 | 1 | |a Xiao, Hong |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Zhang, Lei ELSEVIER |t Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch |d 2018 |d the journal of the International Society of Electrochemistry (ISE) |g New York, NY [u.a.] |w (DE-627)ELV001212419 |
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10.1016/j.electacta.2019.07.023 doi GBV00000000000718.pica (DE-627)ELV047578947 (ELSEVIER)S0013-4686(19)31348-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Zhang, Hang verfasserin aut Nanosized Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> with high surface area as polysulfide capturer combined with graphene for Li–S battery cathode 2019transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> Elsevier Graphene Elsevier Cathode Elsevier Lithium-sulfur batteries Elsevier Polysulfides Elsevier Gao, Qiuming oth Tian, Xuehui oth Li, Zeyu oth Xu, Peng oth Xiao, Hong oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:319 year:2019 day:1 month:10 pages:472-480 extent:9 https://doi.org/10.1016/j.electacta.2019.07.023 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 319 2019 1 1001 472-480 9 |
| spelling |
10.1016/j.electacta.2019.07.023 doi GBV00000000000718.pica (DE-627)ELV047578947 (ELSEVIER)S0013-4686(19)31348-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Zhang, Hang verfasserin aut Nanosized Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> with high surface area as polysulfide capturer combined with graphene for Li–S battery cathode 2019transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> Elsevier Graphene Elsevier Cathode Elsevier Lithium-sulfur batteries Elsevier Polysulfides Elsevier Gao, Qiuming oth Tian, Xuehui oth Li, Zeyu oth Xu, Peng oth Xiao, Hong oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:319 year:2019 day:1 month:10 pages:472-480 extent:9 https://doi.org/10.1016/j.electacta.2019.07.023 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 319 2019 1 1001 472-480 9 |
| allfields_unstemmed |
10.1016/j.electacta.2019.07.023 doi GBV00000000000718.pica (DE-627)ELV047578947 (ELSEVIER)S0013-4686(19)31348-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Zhang, Hang verfasserin aut Nanosized Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> with high surface area as polysulfide capturer combined with graphene for Li–S battery cathode 2019transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> Elsevier Graphene Elsevier Cathode Elsevier Lithium-sulfur batteries Elsevier Polysulfides Elsevier Gao, Qiuming oth Tian, Xuehui oth Li, Zeyu oth Xu, Peng oth Xiao, Hong oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:319 year:2019 day:1 month:10 pages:472-480 extent:9 https://doi.org/10.1016/j.electacta.2019.07.023 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 319 2019 1 1001 472-480 9 |
| allfieldsGer |
10.1016/j.electacta.2019.07.023 doi GBV00000000000718.pica (DE-627)ELV047578947 (ELSEVIER)S0013-4686(19)31348-9 DE-627 ger DE-627 rakwb eng 610 VZ 44.00 bkl Zhang, Hang verfasserin aut Nanosized Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> with high surface area as polysulfide capturer combined with graphene for Li–S battery cathode 2019transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> Elsevier Graphene Elsevier Cathode Elsevier Lithium-sulfur batteries Elsevier Polysulfides Elsevier Gao, Qiuming oth Tian, Xuehui oth Li, Zeyu oth Xu, Peng oth Xiao, Hong oth Enthalten in Elsevier Zhang, Lei ELSEVIER Computed tomographic morphometric analysis of lateral inclination C1 pedicle screw for atlantoaxial instability patients with a narrow C1 posterior arch 2018 the journal of the International Society of Electrochemistry (ISE) New York, NY [u.a.] (DE-627)ELV001212419 volume:319 year:2019 day:1 month:10 pages:472-480 extent:9 https://doi.org/10.1016/j.electacta.2019.07.023 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.00 Medizin: Allgemeines VZ AR 319 2019 1 1001 472-480 9 |
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Nanosized Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> with high surface area as polysulfide capturer combined with graphene for Li–S battery cathode |
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Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. |
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Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. |
| abstract_unstemmed |
Lithium-sulfur (Li–S) battery system shows immense potential as energy storage devices with high energy density. However, the soluble property of polysulfides into the electrolyte during charge/discharge process leads to low sulfur utilization, severe polarization and short cyclic life, which has been a serious obstacle for practical application. How to anchor the polysulfides onto the cathode materials and moreover, enhance its further conversion to the final products, have been important challenges for the utilization of Li–S batteries. Herein, a novel well crystallized nanosized Fe7S8 possessing of a high specific surface area of 55.6 m2 g−1 fabricated by a simple microwave-assisted method combined with high temperature pyrolysis technique, is introduced into the S/C composite cathode for the first time. Strong interaction between polysulfides and the Fe7S8 can be realized to relieve the shuttle effect. The redox reaction of polysulfides can also be promoted to reduce electrode polarization. As a result of the enhanced utilization of sulfur, the optimized SGFS-15 electrode may deliver a high initial discharge capacity of 1307.2 mA h g−1 at 0.1 C (1 C = 1675 mA h g−1) and low decay rates of 0.047% and 0.037% per cycle after 1000 cycles at 1 and 2 C respectively when the sulfur loading is ordinary 1.1 mg cm−2. Even the sulfur loading rises up to 2.6 mg cm−2, a large initial discharge specific capacity of 1134.5 mA h g−1 can be achieved at 0.1 C. After 600 cycles, the specific capacity of 457.3 mA h g−1 with a relatively small average decay rate of 0.062% per cycle can be obtained. Thus, incorporation of the nanosized Fe7S8 with graphene can help to achieve effective performance improvement route for Li–S batteries. |
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Nanosized Fe<ce:inf loc="post">7</ce:inf>S<ce:inf loc="post">8</ce:inf> with high surface area as polysulfide capturer combined with graphene for Li–S battery cathode |
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Gao, Qiuming Tian, Xuehui Li, Zeyu Xu, Peng Xiao, Hong |
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Gao, Qiuming Tian, Xuehui Li, Zeyu Xu, Peng Xiao, Hong |
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10.1016/j.electacta.2019.07.023 |
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