软碳掺杂对大容量锂离子电池低温性能的影响

锂离子电池的低温性能是制约锂离子电池发展的重要因素之一。研究了负极中掺杂20%软碳的电池样品在低温条件下的倍率充电性能、低温放电性能及低温循环性能。实验结果表明,负极掺杂20%软碳的锂离子电池,-10、-20℃充电容量分别能达到25℃时充电容量的91.11%和81.74%;-20℃循环50次,剩余容量为低温初始容量的91.91%。

Effects of soft carbon doping on low temperature performance of large capacity LiFePO4 batteries

Li-ion battery was an environment friendly new power source,but the difficulty of charging at a subzero temperature was an obstacle for the development.20％ soft carbon was added into MCMB,and analyzed the charging,discharging and cycle life performance at low temperature were analyzed.As a result,with 20％ percentage of soft carbon added,charging at-10 ℃ and-20 ℃,compared with 25 ℃,the total charging capacity is 91.11％ and 81.74％;cycle at-20 ℃ for 50 times,the residual capacity is about 91.91％ of the first cycle.