The pursuit of high-energy-density lithium-ion batteries has driven the development of high-voltage cathodes such as LiCoO2(LCO)[1].However,cycling beyond 4.5 V(vs.Li/Li+),especially at elevated temperatures,introduce...The pursuit of high-energy-density lithium-ion batteries has driven the development of high-voltage cathodes such as LiCoO2(LCO)[1].However,cycling beyond 4.5 V(vs.Li/Li+),especially at elevated temperatures,introduces severe challenges of accelerated interfacial side reactions,e.g.,dissolution of the cathode electrolyte interphase(CEI)and transition metal ions[2,3].Conventional carbonate-based electrolytes form CEI layers rich in organic components with poor thermal and electrochemical stability,which leads to rapid capacity fade,gas evolution,and safety hazards,thereby putting rigorous requirements on deliberate electrolyte design[4,5].展开更多
文摘The pursuit of high-energy-density lithium-ion batteries has driven the development of high-voltage cathodes such as LiCoO2(LCO)[1].However,cycling beyond 4.5 V(vs.Li/Li+),especially at elevated temperatures,introduces severe challenges of accelerated interfacial side reactions,e.g.,dissolution of the cathode electrolyte interphase(CEI)and transition metal ions[2,3].Conventional carbonate-based electrolytes form CEI layers rich in organic components with poor thermal and electrochemical stability,which leads to rapid capacity fade,gas evolution,and safety hazards,thereby putting rigorous requirements on deliberate electrolyte design[4,5].
