State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC Shanghai Research Institute of Petrochemical Technology Company Limited, Shanghai 201208, China
Abstract：To enhance the cycling stability and rate capability of LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials under high voltage, fluoroethylene carbonate (FEC) and lithium difluorophosphate (LiPO2F2) were introduced into the electrolyte, and batteries were assembled for systematic evaluation. Through electrochemical performance tests, microscopic morphology characterization, and surface chemical analysis, the performance and mechanisms of the modified batteries were thoroughly investigated. The results indicated that in Li/NCM622 half-cells employing the dual-additive electrolyte, the capacity retention rate after 150 cycles at a 1C rate increased from 68.75% with the baseline electrolyte to 91.25%. At a high current density of 5C, the discharge specific capacity reached 138.2 mAh/g. Mechanistic analysis reveals that FEC and LiPO2F2 synergistically form a low-impedance cathode electrolyte interphase (CEI) layer rich in LiF and LixPOyFz, significantly enhancing interfacial stability and lithium-ion transport efficiency. This study not only elucidated the synergistic mechanism of multi-additive electrolytes under high voltage but also provided new insights for the formulation and development of high-performance lithium-ion battery electrolytes.
ZHANG Daoming,ZHOU Feng,WANG Xiaofei et al. High-Voltage Lithium-Ion Battery with LiNi0.6Co0.2Mn0.2O2 Enabled by Electrolyte Containing Two Additives[J]. Chemical Reaction Engineering and Technology, 2025, 41(5): 602-611.
