以膨润土作为单质硫的载体,热处理得到含硫50％(质量分数)的膨润土/硫复合材料,采用 X 射线衍射、扫描电镜、透射电镜和比表面分析仪对复合材料进行结构、形貌和孔径分析,通过充放电性能测试和交流阻抗对锂硫电池进行电化学性能分析.电化学测试结果表明,在1．0~3．0 V 电压范围内,以0．2、0．5 C 大小的电流密度对电池进行充放电性能测试,首次放电比容量分别为795．6和586．0 mAh/g,100次循环后对应的放电比容量分别为488．5和421．5 mAh/g,容量保持率分别为61．3％和71．8％.
Bentonite/S composite with 50% sulfur for lithium-sulfur batteries is obtained by heat treatment with bentonite as carrier of element sulfur.The structure,morphology and pore size of the composite are character-ized by X-ray diffraction (XRD),scanning electron microscope (SEM),transmission electron microscope (TEM)and Brunauer Emme-Teller (BET)techniques.The electrochemical properties of lithium-sulfur batter-ies are analyzed by charge-discharge and electrochemical impedance spectroscopy tests.It is shown that the first specific discharge capacity of bentonite-sulfur cathode is about 795.6 mAh/g at 0.2 C current rate in the voltage range of 1.0-3.0 V,and it remains 488.5 mAh/g after 100 cycles,which is 61.3% of the initial cycle.Under 0.5 C current density,the first discharge capacity is 586.0 mAh/g,and maintains 421.5 mAh/g after 100 cy-cles,corresponding to 7 1 .8% of the initial cycle.
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