Designable ultra-stable electrode surface engineering by the electrophoretic deposition of modified graphene oxide for rechargeable batteries

Electrode material surface protection via the two-dimensional structured graphene oxide (GO) is studied in our work for rechargeable batteries by the electrophoretic deposition (EPD). However, the large number of oxygen-containing groups on the surface and edge makes GO sheets negatively charged, wh...
Ausführliche Beschreibung

Electrode material surface protection via the two-dimensional structured graphene oxide (GO) is studied in our work for rechargeable batteries by the electrophoretic deposition (EPD). However, the large number of oxygen-containing groups on the surface and edge makes GO sheets negatively charged, which EPD can only be used for anode process. Thus, we apply p-phenylenediamine (PPD) to convert the surface of GO sheets to positive electricity and successfully achieve the cathodic EPD with modified GO. When, the cathode (eg. S, LiFePO4) and anode (eg. Li, Si) with the newfangled GO coating layers are employed in a working battery, the GO can be transformed into reduced graphene oxide (rGO) due to the in-situ electrochemical reduction. Fortunately, the rGO coating layers are acquired on the electrode surfaces, which the stability, adhesion, corrosion resistance, impact resistance have been greatly improved compared to other coating methods. Ultimately, taking advantage of this rGO coating by EDP to simultaneously realize the coating protections of the electrodes can provide alternative strategies to optimize the properties of rechargeable batteries. Ausführliche Beschreibung