锂硫电池用S/KB复合材料的制备及性能

Synthesis and performance of S / KB composite for Li / S battery

以科琴碳黑（KB）作为单质硫的载体，分别用球磨法和热处理法制备S／KB复合正极材料。用XRD、循环伏安、电化学阻抗谱（EIS）和恒流充放电测试，对材料进行分析。球磨法制备的材料首次放电比容量较高，1．0C放电至1．5V，最高达1670mAh／g；热处理法制备的材料循环性能更稳定，以0．5C在1．5～2．5V循环30次，放电容量保持率约为82％。

S/KB composites were synthesized by ball-milling and heat-treatment, respectively, using super conductive Ketjen black （KB） as carrier of element sulfur. The materials were analyzed by XRD, cyclic vohammetry, electrochemical impedance spectroscopy （EIS）and galvanostatic charge-discharge tests. The material prepared by ball-milling owned higher initial discharge capacity up to 1 670 mAh/g when discharged to 1.5 V with 1.0 C;the material prepared by heat-treatment had better cycle performance,when cycled in 1.5 ~ 2. 5V with 0. 5 C, the discharge capacity retention was about 82% after 30 cycles.