Effect of amount and process of lithium supplementation at anode on performance of battery
In order to solve the problem that the formation of a solid electrolyte interface(SEI)on the anode of Li-ion battery consumes active Li+,resulting in low initial Coulombic efficiency(ICE)and capacity attenuation,lithium foil interval lithium supplementation is carried out on the graphite anode,the effect of lithium supplementation amount and process on the battery performance is studied.Lithium supplementation at anode can make up for the loss of active lithium in the battery.Compared with battery A without lithium supplementation,the initial charge-discharge efficiency of battery B supplemented with 12.76%lithium is increased by 7.54 percentage points during the formation process,the capacity retention rate of 1.00 C cycles at room temperature for 445 cycles in 2.50-3.65 V is increased by 2.77 percentage points.The initial charge-discharge efficiency of battery C with 22.34%lithium supplementation is increased by 9.24 percentage points,the capacity retention rate is increased by 4.06 percentage points.The high temperature static of battery C at 45℃after preformation is more conducive to the embedding of the lithium source and the battery performance.
lithium iron phosphate(LiFePO4)anode prelithiuminitial charge-discharge efficiencycapacity retention
国家科技期刊平台
NSTL
万方数据
