氮掺杂碳包覆的蛋黄壳结构硅负极材料  

Yolk-shell silicon anode material coated with nitrogen-doped carbon

作　　者：鲍恺婧 张召凯 朴贤卿[1] 孙卓[1] BAO Kaijing;ZHANG Zhaokai;PIAO Xianqing;SUN Zhuo(Engineering Research Center for Nanophotonics and Advanced Instrument(Ministry of Education),School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学物理与电子科学学院纳光电集成与先进装备教育部工程研究中心,上海200241

出　　处：《华东师范大学学报（自然科学版）》2022年第1期22-30,共9页Journal of East China Normal University(Natural Science)

摘　　要：采用间苯二酚-甲醛为碳源,三聚氰胺为氮源,以NaOH为蚀刻剂,成功合成氮掺杂碳包覆的蛋黄壳结构硅(Si@void@N-C)锂离子电池复合负极材料.对样品进行XRD、SEM和X射线电子能谱,透射电子显微镜(TEM)和电化学测试等表征及测试.结果表明,成功合成了蛋黄壳结构的Si@void@N-C复合负极材料.同时,该复合材料具有优异的电化学性能,以0.1 A/g的电流密度进行充放电,首次容量可达1282.3 mAh/g,经过100次循环后,其比容量仍高达994.2 mAh/g,其容量保持率为77.5%,表现出了良好的循环性能.Si@void@N-C材料中,氮掺杂的碳壳可以增加复合材料的导电性,同时,蛋黄壳结构可有效缓解硅的体积效应,有利于形成稳定的SEI膜,从而提高电池的循环稳定性.Using resorcinol-formaldehyde resin as the carbon source,melamine as the nitrogen source,and NaOH as the etchant,a nitrogen-doped carbon-coated silicon(Si@void@N-C)anode material with a yolk-shell structure was synthesized.The samples were characterized and tested by XRD,SEM and X-ray photoelectron spectroscopy,TEM,and electrochemical tests;the results confirmed that a Si@void@NC composite anode material with a yolk-shell structure was successfully synthesized.The material was found to have excellent electrochemical performance.The initial capacity reached 1282.3 mA/g after charging and discharging at a current density of 0.1 A/g.After 100 cycles,its specific capacity was as high as 994.2 mAh/g with a capacity retention of 77.5%,demonstrating good cycle performance.The nitrogen-doped carbon shell of the Si@void@N-C material helps with the electrical conductivity of the composite material.Meanwhile,the yolk-shell structure effectively alleviates the volume effect of silicon;this feature is beneficial to the formation of a stable SEI film and improves the cycle stability of the battery.

关 键 词：锂离子电池 氮掺杂碳 硅负极 蛋黄壳结构 

分 类 号：TM912.9[电气工程—电力电子与电力传动]