导电剂对锂离子电池性能的影响

Effect of conductive agent on performance of lithium ion battery

将相同质量的两种导电炭黑LITX和SP分别与导电石墨KS-6混合,组成锂离子电池用双组分导电剂。两种双组分导电剂制成的电池分别进行电性能测试,经过分容和高温搁置后,以LITX+KS-6为导电剂的电池具有较高的容量,以SP+KS-6为导电剂的电池具有较小的内阻。在不高于2.0 C充电的情况下,以LITX+KS-6为导电剂的电池具有较高的充电电压和容量。HPPC和低温1.0 C放电性能测试结果表明,以SP+KS-6为导电剂的电池具有较小的内阻和较大的功率密度,较高的低温容量保持率、放电电压和放电容量。

Two kinds of conductive carbon black, LITX and SP were mixed with the conductive graphite KS-6 to compose two-component conductive agent for lithium ion battery, respectively. The electrical performance of two battery using two-component conductive agent were tested. After grading and laying in the high temperature, the battery using LITX ＋ KS-6 conductive agent had the higher capacity, the battery using SP ＋ KS-6 conductive agent had the smaller internal resistance. In case that charging was not higher than 2.0 C ratio, the battery using LITX ＋KS-6 conductive agent had the higher charge batteries voltage and capacity. Test results of HPPC and low temperature 1.0 C discharge performance show that the battery using SP ＋ KS-6 conductive agent has the smaller internal resistance and the larger power density, the higher low temperature retention capacity ratio, discharge voltage and discharge capacity.