Mn2O3/Fe2O3/少层石墨烯/硫锂硫电池正极材料的制备及其电化学性能

Synthesis and electrochemical performance of Mn2O3/Fe2O3/few layers graphene/sulfur cathode for lithium-sulfur batteries

采用熔盐法、层间催化剥离法、退火工艺及熔化扩散法制备出Mn2O3/Fe2O3/少层石墨烯/硫复合材料作为锂硫电池正极材料。高导电少层石墨烯构成三维导电网络,为电极反应过程中电子传输提供通道,有利于提升锂硫电池的比容量。金属氧化物颗粒均匀分布在少层石墨烯表面,对多硫化物具有强烈化学吸附作用,能够有效抑制多硫化物的溶解和迁移效应,有利于增强锂硫电池循环稳定性。结果表明,Mn2O3/Fe2O3/FLG30/S电极显示出高比容量和优异的循环性能。0.1 C倍率下,其初始容量高达886.3 mAh·g^-1,100圈循环后容量保持率高达88.1%。

Mn2O3/Fe2O3/few layer graphene/sulfur composites were prepared by melted salt method,interlayer catalytic exfoliation,annealing and melt diffusion method in sequence for lithium-sulfur batteries cathode.The three-dimensional conductive network formed by highly conductive few layers graphene provides electron transfer channel,thus promoting the high capacity performance of lithium-sulfur batteries.The metal oxides distributed uniformly on the surface of graphene exhibit strong interaction towards polysulfides,which can restrain the dissolution of polysulfides and shuttle effect and promote the cycling performance of lithium-sulfur batteries.As a result,the Mn2O3/Fe2O3/FLG30/S cathode shows high capacity and cycling performance.The cathode delivers an initial discharging capacity of 886.3 mAh·g^-1 with a high capacity retention of 88.1%after 100 cycles at rate of 0.1 C.