High-voltage cell performance and thermal stability of nanoarchitectured polyimide gel polymer electrolyte-coated LiCoO2 cathode materials

摘要: Abstract In this study, nanoarchitectured polyimide (PI) gel polymer electrolyte (GPE)-coated lithium cobalt oxide (LiCoO 2 ) cathode materials are fabricated and their application to high-voltage lithium-ion batteries is explored. Distinctive features of the PI coating layer highly-continuous surface coverage with nanometer thickness (∼5 nm) also facile ion transport via nanoscale layer. Based on physicochemical characterization layer, its influence cell performance thermal stability charged LiCoO investigated as a function charge cut-off voltage (herein, 4.4, 4.5, 4.6 V). The anomalous which behaves an ion-conductive protection barrier mitigate undesired side reactions predominantly occurring onto surface, plays viable role in improving alleviating interfacial exothermic reaction between delithiated liquid electrolyte. Notably, these advantageous effects PI-coated become more pronounced increased, where highly vulnerable electrochemical decomposition.