纳米SnS_(2)/Sb_(2)S_(3)@G异质结的构筑及其储锂性能

Construction of nano SnS_(2)/Sb_(2)S_(3)@G heterojunction and its lithium storage properties

采用水热法制备SnS_(2)/Sb_(2)S_(3)@G复合材料,并将此复合材料用作锂离子电池负极。本文向SnS_(2)体系中引入石墨烯,有效缓解SnS_(2)颗粒在循环过程中的体积膨胀效应,同时引入三硫化二锑(Sb_(2)S_(3))与SnS_(2)形成异质结构也可有效改善材料电导率。结果表明,该结构设计策略有利于促进SnS_(2)/Sb_(2)S_(3)的循环稳定性。在2 A/g电流密度下循环1200次后,SnS_(2)/Sb_(2)S_(3)@G的放电比容量可达到521.7(mA∙h)/g,且仍未出现下降的趋势。因此,所制备的SnS_(2)/Sb_(2)S_(3)@G复合材料具有良好的循环稳定性,有望成为下一代锂离子电池负极材料。

SnS_(2)/Sb_(2)S_(3)@G composites were prepared by hydrothermal method and used as anodes for lithium ion batteries.In this paper,the graphene was introduced into the SnS_(2)system to effectively alleviate the volume expansion effect of SnS_(2)particles during cycling,and the introduction of forming heterostructure structures between SnS_(2)and Sb_(2)S_(3)can also effectively improve the electrical conductivity of the material.The results show that this structural design strategy is beneficial to promote the cycling stability of SnS_(2)/Sb_(2)S_(3).After 1200 cycles at current density of 2 A/g,the discharge specific capacity of SnS_(2)/Sb_(2)S_(3)@G can still reach 521.7(mA∙h)/g,and there is no downward trend.Therefore,the as-prepared SnS_(2)/Sb_(2)S_(3)@G composite has good cycling stability and is expected to be the anode material for next-generation lithium-ion batteries.