为增强单质硫电极的导电性能和抑制活性硫在电解液中的溶解,选用高比表面积、强吸附能力的多壁碳纳米管作为非活性添加剂,通过密封分段加热的方式与单质硫形成复合材料.X射线衍射(XRD)、扫描电子显微镜(SEM)和比表面积(BET)测试均表明单质硫均匀分散到碳纳米管基体中.电化学测试显示添加碳纳米管的硫电极首次放电比容量高达1 487.0 mAh · g-1,硫的利用率达到了88.9%,循环50次后比容量还保持在913.7 mAh · g-1,较之普通硫电极其电化学性能得到显著改善.
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