| 초록 |
As a facile and scalable approach to the surface modification of high-voltage cathode materials for lithium-ion batteries, direct UV-assisted conformal coating of poly(ethylene glycol diacrylate) (PEGDA) gel polymer electrolyte on as-formed LiCoO2 (LCO) cathode is presented. The PEGDA coating layer with nanometer-thickness (∼20 nm) is successfully introduced on the NCM surface. The PEGDA-coated LCO cathode improves the high-voltage (4.4 V) cycling performance and Thermal Stability. This demonstrates that the PEGDA layer proposed herein, which is completely different from conventional inorganic material-based coating layers, acts as a new ion-conductive protective film that effectively suppresses unwanted interfacial side reactions between the high-voltage cathode materials and liquid electrolyte. |
