Li metal is the most attractive and promising anode material for next-generation high-energy batteries.However,uncontrolled Li dendrite growth during cycling remains a highly challenging drawback.To solve this problem...Li metal is the most attractive and promising anode material for next-generation high-energy batteries.However,uncontrolled Li dendrite growth during cycling remains a highly challenging drawback.To solve this problem,silver-coated graphene(Ag/GH)was prepared via a simple liquid-phase reduction method.The effect of Ag/GH on Li deposition behavior was investigated by adjusting the dispersion of Ag nanoparticles(Ag NPs).Subsequently,a composite electrode was fabricated via uniform deposition of metallic Li on Ag/GH.Ag was used as a lithiophilic nucleating agent to ensure uniform deposition of Li and inhibit the growth of Li dendrites on the anode.The prepared composite anode showed a significantly improved performance compared to the unmodified electrode.The symmetric cell comprising this composite electrode exhibited a stable cycling performance with a low hysteresis of~40 mV and a lifetime of>2000 h at a current density of 0.5 mA·cm^(-2).Meanwhile,the discharge capacity reached 0.5 mAh·cm^(-2).In addition,Ag/GH was found to be amenable to large-scale synthesis.Thus,the composite Ag/GH anode exhibited improved performance and the preparation method showed significant potential for application in the manufacture of Li metal batteries.展开更多
采用改进的Hummer法制备氧化石墨(GO),以干燥浸泡法制备三维氧化石墨烯(r GO)-Ag/泡沫镍(NF)复合材料,对其物相、形貌和组成进行分析,研究了其电化学性能.结果表明,复合材料呈疏松多孔结构,Ag颗粒直径为200 nm,电流密度为5 m A/cm^2时...采用改进的Hummer法制备氧化石墨(GO),以干燥浸泡法制备三维氧化石墨烯(r GO)-Ag/泡沫镍(NF)复合材料,对其物相、形貌和组成进行分析,研究了其电化学性能.结果表明,复合材料呈疏松多孔结构,Ag颗粒直径为200 nm,电流密度为5 m A/cm^2时初次比容量为1.59 F/cm^2,循环1000次后为初始容量的70%,循环稳定性良好.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51972224)China Postdoctoral Science Foundation(No.2019M661014)。
文摘Li metal is the most attractive and promising anode material for next-generation high-energy batteries.However,uncontrolled Li dendrite growth during cycling remains a highly challenging drawback.To solve this problem,silver-coated graphene(Ag/GH)was prepared via a simple liquid-phase reduction method.The effect of Ag/GH on Li deposition behavior was investigated by adjusting the dispersion of Ag nanoparticles(Ag NPs).Subsequently,a composite electrode was fabricated via uniform deposition of metallic Li on Ag/GH.Ag was used as a lithiophilic nucleating agent to ensure uniform deposition of Li and inhibit the growth of Li dendrites on the anode.The prepared composite anode showed a significantly improved performance compared to the unmodified electrode.The symmetric cell comprising this composite electrode exhibited a stable cycling performance with a low hysteresis of~40 mV and a lifetime of>2000 h at a current density of 0.5 mA·cm^(-2).Meanwhile,the discharge capacity reached 0.5 mAh·cm^(-2).In addition,Ag/GH was found to be amenable to large-scale synthesis.Thus,the composite Ag/GH anode exhibited improved performance and the preparation method showed significant potential for application in the manufacture of Li metal batteries.
