CTAB辅助水热合成球状纳米花MoS2/C复合材料及其电化学性能研究

以钼酸钠(Na₂MoO₄·2H₂O)、硫脲(NH₂CSNH₂)、CTAB为原料, 利用水热法合成了MoS₂/C球状纳米花复合材料。通过XRD、SEM、TEM、TG等分析测试方法, 研究了不同CTAB添加量对MoS₂/C复合材料的微观结构、表面形貌的影响规律, 结果显示, 有部分无定形碳嵌入了MoS₂层间, 并抑制了MoS₂(002)面的堆积。电化学测试表明: 与纯MoS₂相比, MoS₂/C复合材料具有更好的电化学性能, 当加入0.025 g CTAB时首次放电比容量达到730 mAh/g, 在100 mA/g的电流密度下经过100次循环比容量稳定在415 mAh/g。在此基础上讨论了MoS₂/C球状纳米花复合材料的可能生长机理以及对材料电化学性能的影响规律。

CTAB-assisted Synthesis of MoS2/C Nano-flowers with Improved Electrochemical Performances for Lithium Ion Batteries

MoS₂/C composites were prepared by a simple CTAB assistant thermal reduction method using sodium molybdate, thiourea and CTAB as starting materials. The samples were characterized by XRD, SEM, TEM, and TG. It is confirmed that the amorphous carbon is partially inserted into the interlayer spaces of molybdenum disulfide and inhibits the accumulation of (002) plane. Meanwhile, the electrochemical properties were studied in detail. As a consequence, the MoS₂/C composites have better electrochemical performance than pure MoS₂. The composite synthesized by adding 0.025 g CTAB shows the best electrochemical performance. The initial discharge capacity was 730 mAh/g and a stable capacity above 415 mAh/g was retained for 100 cycles tested at 100 mA/g. At last, the possible growth mechanism of the MoS₂/a-C composites and the influence of different micro-morphology are also calculated.