富锂锰基正极材料动力锂离子电池的倍率性能

Rate performance of Li-rich manganese based cathode material power Li-ion battery

以富锂锰基材料为正极材料,人造石墨为负极材料,用叠片工艺制备额定容量为5 Ah的5580135型软包装动力锂离子电池,研究正极面密度、导电剂含量、负极/正极容量比及电解液对倍率放电性能的影响。当正极面密度为240 g/m2、正极导电剂含量为4%、负极/正极容量比为1.1并以1 mol/L Li PF6/EC+PC+EMC+DMC为电解液时,电池的倍率性能最好。25℃时以1.00 C充电、5.00 C放电循环1 000次,容量保持率为99.5%。

5580135 type soft package power Li-ion battery with the nominal capacity of 5 Ah was prepared by lamination technique with Li-rich manganese based cathode material and artificial graphite anode material. The effects of bulk density,content of conductive agent in cathode,capacity ratio of cathode and anode and electrolyte on rate discharge performance were studied. The optimized process conditions to improve the rate performance were： the bulk density was 240 g / m^2,the content of conductive agent was 4%,the ratio of anode and cathode capacity was 1. 1,the electrolyte was 1 mol / L LiPF6/ EC ＋ PC ＋ EMC ＋ DMC. After optimization,the capacity retention ratio was 99. 5% when battery charged at 1. 00 C and discharged at 5. 00 C after 1 000 cycles.