MoS_(2)/C纳米复合材料的合成及其电化学性能研究

Preparation and electrochemical performance of MoS_(2)/C nanocomposites

理论比能量高达2600 Wh/kg的锂硫电池已经成为锂电池研究热点,然而硫导电性不好、穿梭效应和锂化体积效应较大等问题阻碍了锂硫电池的产业化。将无定型多孔碳材料的高导电性和极性MoS_(2)的固硫作用相结合改善锂硫电池的电化学性能。所得的S@MoS_(2)/C在0.05 C和2 C电流密度下的放电比容量分别为1507和406.3 mAh/g,比S@MoS_(2)在相同电流密度下的放电比容量(1400和345.7 mAh/g)更高。在循环性能测试中,S@MoS_(2)/C容量保持率为46.9%,要高于S@MoS_(2)(39.1%)。因此,MoS_(2)/C复合材料作为硫载体可以显著改善锂硫电池性能。

The lithium sulfur batteries with the theoretical energy density of 2600 Wh/kg have become a hotspot for lithium battery.However,poor electronic conductivity of sulfur,shuttle effect and severe volume effect are the main factors hindering its industrialization.The excellent conductivity of amorphous porous carbon was combined with the sulfur-anchoring of polar MoS_(2) to improve the electrochemical performance of lithium sulfur batteries.The discharge specific capacities of S@MoS_(2)/C are 1507 and 406.3 mAh/g at 0.05 C and 2 C,respectively,higher than those of S@MoS_(2)(1400 and 345.7 mAh/g).The capacity retention of S@MoS_(2)/C(46.9%)is also higher than that of S@MoS_(2)(39.1%)after 100 cycles.As a result,MoS_(2)/C composite material can be used as an effective sulfur host to significantly improve the electrochemical performance of lithium sulfur batteries.