长寿命高倍率锂离子电池的开发及工艺优化

Development and technology optimization of long-life high rate Li-ion battery

研究石墨的比表面积、粒径,以及压实密度、化成工艺等因素对无人机用C/LiCoO_(2)锂离子电池性能的影响。采用小粒径G2石墨为负极材料的电池性能最优;当负极压实密度由1.31 g/cm^(3)提升至1.57 g/cm^(3)时,电池的保液量降低9.5%,直流内阻降低11.3%。控制负极压实密度为1.31 g/cm^(3)、正极涂覆面密度为15.75 mg/cm^(2),化成温度为45℃、压力为275510Pa,制备的电池最大放电倍率可达18.00C。以1.00C充电至4.2V、5.00C放电至3.0V循环1000次,容量保持率为91.3%。

The effects of the specific surface area,particle size of graphite,compacted density and forming process on the performance of C/LiCoO_(2) Li-ion battery for the unmanned aerial vehicle(UAV)were studied.The battery using small particle size G2 graphite as anode material had the best performance.When the compacted density of negative plate increased from 1.31 g/cm^(3) to 1.57 g/cm^(3),the preserving water capability of the battery was decreased by 9.5%,the direct current internal resistance was decreased by 11.3%.The highest discharge rate reached 18.00C when battery was prepared under conditions of negative plate compacted density of 1.31 g/cm^(3),positive plate coating density of 15.75 mg/cm^(2),formation temperature of 45℃and formation pressure of 275510 Pa.The capacity retention rate was 91.3%after cycle 1000 times with 1.00C charging to 4.2V and 5.00C discharging to 3.0V.