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    • Three-dimensional nitrogen-doped carbon coated hierarchically porous silicon composite as lithium-ion battery anode

    三维氮掺杂碳涂层分层多孔硅复合材料作为锂离子电池负极

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    出版日期： 2021
    标签： Silicon-based anode material Sol-gel Hierarchically porous monolith N-doped carbon Li-ion batteries

    出版日期:2021


    杂志名称:Journal of Alloys and Compounds
    卷号:874
    期数:suppl_C
    刊号:0925-8388
    出版日期:2021

    简介:Three-dimensional(3D)Nitrogen-dopedcarboncoatedhierarchicallyporoussilicon(hp-Si@NC)compositewithcocontinuousskeletonsandabundantinterconnectedmacroporeswaspreparedbyasol-gelroute,followedbyamagnesiothermicreductionandapolydopaminepyrolyzation.TheBETspecificsurfaceareaandporevolumeoftheobtainedhp-Si@NCcompositearecalculatedtobearound220.4?m2·g─1and0.247?cm3·g─1,respectively.BothhierarchicallyporousSimonolithandhp-Si@NCcompositepossessgreatelectrochemicalperformances.ThehierarchicallyporousSimonolithexhibitsaninitialdischargeandchargecapacityofabout1943and1621?mAh·g─1,andmaintainsareversiblecapacityofabout125?mAh·g─1inthe100thcycle.Thehp-Si@NCcompositerevealsadischargecapacityofabout1077?mAh·g─1andachargecapacityof723?mAh·g─1inthefirstcycle,andareversiblecapacityofaround700?mAh·g─1remainsafter100cycles.Thecoulombicefficiencyincreasesfrom67.1%inthefirstcycleto97%inthesecondcycleandto99%inthe100thcycle,withagreatrateperformance.AllthesefavorableelectrochemicalcharacterizationsbenefitfromuniqueporestructureandN-dopedcarbonlayer.Thehp-Si@NCcompositeobtainedbyintegratingwithsol-gelprocess,magnesiothermicreductionandpolydopaminepyrolyzationcanbepromisinglyappliedasananodeinLi-ionbatterieswithabrightprospect.

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