二次锂电池用正极材料多硫化碳炔充放电机理探讨

Charge-discharge Principle of Crabyne Polysulfide as Cathode Material for Lithium Batteries

二次锂电池用正极材料多硫化碳炔具有较高的充放电效率与良好的循环性能,200次循环容量保持率为60.21%,效率接近100%。应用循环伏安、XRD、RAMAN等方法对其充放电机理进行了研究。结果表明:充放电过程中,多硫化碳炔中无Li2S生成,有可逆的新相生成,碳基体也发生了可逆的变化,这些变化的高度可逆性是多硫化碳炔循环性能优良的根本原因。

The crabyne polysulfide as cathode material for lithium batteries had a perfect performance during charge-discharge cycles. The capacity retention was 60. 21% after 200 cycles, and the efficiency were almost 100%. Its charge-discharge principle was investigated by different current discharge, cyclic voltammetry, and X-Ray Diffraction and RAMAN spectrum methods were used at different charging-discharging stages. The results indicate that Li2 S was not created and some new materials were found in crabyne polysulfide, and this was the essential reason of the stable reversible capacity.