石墨烯包覆硫-镍复合材料用于锂硫电池

Graphene coated S-Ni composite used in lithium-sulfur battery

通过化学还原法制备硫(S)-镍(Ni)复合材料,在常温下,用抗坏血酸还原氧化石墨烯对S-Ni复合材料进行包覆,形成一种可抑制穿梭效应的石墨烯包覆结构。XRD、SEM分析结果表明:该方法制备了还原氧化石墨烯包覆S-Ni复合材料(RGO@S-Ni)。复合材料以0.2 mA/cm^2的电流密度在1.5~3.0 V充放电,首次放电比容量为885.051 m Ah/g,第200次循环的比容量保持在672.991 m Ah/g,容量保持率为76.04%。

Sulfur（ S）-nickel（ Ni） composite was synthesized by chemical reduction. At room temperature,ascorbic acid reduction of graphene oxide was employed to encapsulate S-Ni composite,then graphene coated S-Ni structure was formed. The shuttle effect was restrained by the graphene coating structure. Results of XRD,SEM analyses showed that this method was developed to prepare reduced graphene oxide（ RGO） coated S-Ni composite（ RGO@ S-Ni）. The specific discharge capacity of the composite was 885. 051 m Ah / g in the initial cycle and 672. 991 m Ah / g in the 200 th cycle,when charged-discharged in 1. 5 ~ 3. 0 V with the current density of 0. 2 m A / cm^2,the capacity retention ratio was 76. 04%.