正极材料高温热处理后锂硫电池电气性能变化

采用多壁碳纳米管(MWCNT)、气相生长碳纤维(VGCF)、活性炭(AC)为单质硫的载体,通过高温热处理的方法制备锂硫电池用S/C正极材料。通过对所得材料进行X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)、热重分析、恒流充放电及循环伏安测试等对材料的结构及电气性能进行分析。研究发现,锂硫电池的放电比容量及循环性能受碳材料的影响较大,其中S/VGCF复合材料的电化学性能较好,当以0.1 C的电流在1.5~3.0 V进行充放电时,其首次和第100次循环的放电比容量分别为1 205.62、613.18 m Ah/g。

Change of electrical properties of lithium sulfur batteries after high temperature heat treatment

Multi walled carbon nanotubes (MWCNT) and vapor grown carbon fibers (VGCF),activated carbon (AC) were used as the carrier of sulfur.S/C cathode material for lithium sulfur battery prepared by high temperature heat treatment.The structure and electrochemical properties of the materials were analyzed by XRD,SEM,thermogravimetric analysis,galvanostatic charge discharge and cyclic voltammetry.The study found that the discharge of lithium sulfur battery capacity and cycling performance is greatly affected by the carbon material,the electrochemical performance of SNGCF composites is better.When the charge discharge current in 1.5-3.0 V to 0.1 C,the specific capacity of first and 100th discharge cycles was 1 205.62 mAh/g,613.18 mAh/g.