Preparation and lithium storage performances of g-C_(3)N_(4)/Si nanocomposites as anode materials for lithium-ion battery  

作　　者：Zhengxu BIAN Zehua TANG Jinfeng XIE Junhao ZHANG Xingmei GUO Yuanjun LIU Aihua YUAN Feng ZHANG Qinghong KONG 

机构地区：[1]School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China [2]Marine Equipment and Technology Institute,Jiangsu University of Science and Technology,Zhenjiang 212003,China [3]Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province,Yancheng Institute of Technology,Yancheng 224051,China [4]School of the Environment and Safety Engineering,Jiangsu University,Zhenjiang 212013,China

出　　处：《Frontiers in Energy》2020年第4期759-766,共8页能源前沿（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.51672114 and 51603091);the Natural Science Foundation of Jiangsu Province(BK20181469);the Joint Open Fund of Jiangsu Collaborative Innovation Center for Ecological Building Material and Environmental Protection Equipment and Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province,the Open Project of Key Laboratory for Ecological-Environment Materials of Jiangsu Province(JH201815);the Foundation from Marine Equipment and Technology Institute for Jiangsu University of Science and Technology,China(HZ20190004).

摘　　要：As the anode material of lithium-ion battery,silicon-based materials have a high theoretical capacity,but their volume changes greatly in the charging and discharging process.To ameliorate the volume expansion issue of silicobased anode materials,g-C_(3)N_(4)/Si nanocomposites are prepared by using the magnesium thermal reduction technique.It is well known that g-C_(3)N_(4)/Si nanocomposites can not only improve the electronic transmission ability,but also ameliorate the physical properties of the material for adapting the stress and strain caused by the volume expansion of silicon in the lithiation and delithiation process.When g-C_(3)N_(4)/Si electrode is evaluated,the initial discharge capacity of g-C_(3)N_(4)/Si nanocomposites is as high as 1033.3 mAh/g at 0.1 A/g,and its reversible capacity is maintained at 548 mAh/g after 400 cycles.Meanwhile,the improved rate capability is achieved with a relatively high reversible specific capacity of 218 mAh/g at 2.0 A/g.The superior lithium storage performances benefit from the unique g-C_(3)N_(4)/Si nanostructure,which improves electroconductivity,reduces volume expansion,and accelerates lithiumion transmission compared to pure silicon.

关 键 词：magnesium thermal reduction g-C_(3)N_(4)/Si nanocomposites volume expansion ELECTROCONDUCTIVITY lithium-ion battery 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]