LiTFSI对Li/FeS_2电池放电性能的影响

Effects of LiTFSI on electrochemical performance of Li/FeS_2 cell

为研究二(三氟甲基磺酰)亚胺锂(LiTFSI)对Li/FeS2电池电化学性能的影响,将LiTFSI作为添加剂加入到1 mol/L LiI/(DOL+DME)电解液中,以此电解液制作得到的AA型Li/FeS2实体电池,在60℃高温和-40℃低温下的放电容量和放电电压都得到了提高。当LiTFSI添加量为0.5%(质量分数)时放电性能达到最佳,60℃下1 A放电容量可达3 200 mAh,-40℃下250 mA放电容量可达3 108 mAh。同时,电池的大电流放电性能也得到了改善。

In order to study the effect of lithium bis （trifluoromethanesulfonyl） imide （LiTFSI） on the electrochemical performance of Li/FeS2 battery, LiTFSI was used as an additive in 1 mol/L Lil/DOL＋DME electrolyte solution. The results show that the addition of LiTFSI to electrolyte in AA-size Li/FeS2 cell leads to an improvement in discharge capacity and the discharge voltage platform at 60 ℃ and --40℃. Additive amount of 0.5% shows the optimum electrochemical performance, the discharge capacity can reach 3 200 mAh at a discharge current of 1 A at 60 ℃, and 3 108 mAh at 250 mA at -40℃. Meanwhile, the high-rate discharging performance of the Li/FeS2 cell was also improved.