Thermal studies on Li($ CH_{3} $CN)4$ PF_{6} $ and Li($ C_{4} %$ H_{10} %$ O_{2} $)2$ PF_{6} $ complexes by the TG–DTA–MS and DSC

Abstract Li($ CH_{3} $CN)4$ PF_{6} $ and Li($ C_{4} %$ H_{10} %$ O_{2} $)2$ PF_{6} $ complexes are important intermediates created in the synthetic process of high-purity $ LiPF_{6} $ electrolyte via transformation method. The thermal decomposition behavior of as-prepared Li($ CH_{3} $CN)4$ PF_{6} $...
Ausführliche Beschreibung

Abstract Li($ CH_{3} $CN)4$ PF_{6} $ and Li($ C_{4} %$ H_{10} %$ O_{2} $)2$ PF_{6} $ complexes are important intermediates created in the synthetic process of high-purity $ LiPF_{6} $ electrolyte via transformation method. The thermal decomposition behavior of as-prepared Li($ CH_{3} $CN)4$ PF_{6} $ and Li($ C_{4} %$ H_{10} %$ O_{2} $)2$ PF_{6} $ crystals in pure nitrogen atmosphere has been studied by means of thermogravimetric–differential thermal analysis coupled with mass spectrometry (TG–DTA–MS). Results suggest that the decomposition of Li($ CH_{3} $CN)4$ PF_{6} $ complex can be roughly divided into a three-stage process, and $ CH_{3} $CN is the primary gas product of decomposition process for Li($ CH_{3} $CN)4$ PF_{6} $ in open $ Al_{2} %$ O_{3} $ pans. Further insight into Li($ C_{4} %$ H_{10} %$ O_{2} $)2$ PF_{6} $ crystal indicates that it undergoes a similar decomposition process to Li($ CH_{3} $CN)4$ PF_{6} $. Accordingly, the detailed deduction of the thermal decomposition mechanism formulas for them was presented in this paper. Besides, the thermal behaviors of Li($ CH_{3} $CN)4$ PF_{6} $ and Li($ C_{4} %$ H_{10} %$ O_{2} $)2$ PF_{6} $ complexes in hermetic aluminum pan were also investigated by differential scanning calorimetry (DSC). Ausführliche Beschreibung