高电压LiNi0.5Mn1.5O4基全电池电解液的优化及探究OA

Lithium-ion batteries are widely used in portable electronic products and new energy vehicles due to their excellent energy and power characteristics.With the increasing scarcity of fossil fuels and the intensification of environmental problems,its application scope has gradually expanded to the field of new energy vehicles.In order to meet the needs of high energy density and high power output,the con-struction of high-voltage battery systems has become a research hotspot.Among them,LiNi0.5Mn1.5O4(LNMO)cathodes have attracted much attention due to their high-voltage platform,high theoretical spe-cific capacity and energy density.However,LNMO batteries matched with graphite anodes have not yet been industrialized,mainly due to the mismatch of electrolyte systems.The performance changes of 1%,3%and 5%succinic anhydride(SA)were investigated in the electrolyte,focusing on the capacity attenua-tion and side reactions of LNMO full cells.The results show that the battery with 3%SA(cathode:3%LNMO@LSMO;Anode:5%TEOS-NG,LNMO/NG-3%SA)perform best.This is attributed to the decomposition of SA during charging and discharging to form a stable interface film,which can inhibit electrolyte decomposition,reduce side reactions,and stabilize the electrode structure,thereby signifi-cantly improving capacity retention and cycle stability.