锂硫电池硫基碳正极材料及其改性研究进展

Research progress of sulfur-based cathode carbon materials and modification for lithium-sulfur batteries

综述了锂硫电池存在的问题和碳纤维、碳纳米管、氧化石墨烯、多孔碳四种碳材料的性能以及其在锂硫电池正极中的应用,并探讨了碳材料原位掺杂非金属(C、N、O、B等)和复合各种金属化合物对材料的导电性和对多硫化物吸附性能的影响,以及对锂硫电池循环性能的影响。提出非金属掺杂多孔碳材料复合金属化物作为锂硫电池正极碳材料来降低多硫化物的穿梭效应以及反应过程中的体积膨胀,提高活性物质利用率,进而提高锂硫电池性能。

The problems existing in lithium sulfur batteries,the properties of carbon fiber,carbon nanotubes,graphene oxide and porous carbon,and their applications in the positive electrode of lithium sulfur batteries were reviewed.The effects of in-situ doping of carbon materials with nonmetals(C,N,O,B,etc.)and composite metal compounds on the electrical conductivity of materials and the adsorption properties of polysulfide,as well as the cycling properties of lithium sulfur batteries are discussed.It is proposed that non-metallic doped porous carbon with metal compound as cathode carbon material to reduce the shuttle effect of polysulfide and the volume expansion in the reaction process,improve the utilization rate of active substances,and thus improve the performance of lithium sulfur batteries.