Metallic Sb-stabilized porous silicon with stable SEI and high electron/ion conductivity boosting lithium-ion storage performance  

作　　者：Jia-Guo Deng Hao-Qin Feng Yu-Long Xu Si-Guang Guo Jian-Ping Li Kai-Fu Huo Ji-Jiang Fu Biao Gao Pual-K.Chu 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology,Wuhan University of Science and Technology,Wuhan 430081,China [2]Wuhan National Laboratory for Optoelectronics(WNLO),School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China [3]Department of Physics,Department of Materials Science&Engineering,and Department of Biomedical Engineering,City University of Hong Kong,Hong Kong 999077,China

出　　处：《Rare Metals》2024年第9期4234-4242,共9页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51974208,U2003130,52002297 and U2004120);the Basic Research Program of Shenzhen Municipal Science and Technology Innovation Committee(No.JCYJ20210324141613032);the Outstanding Youth Foundation of Natural Science Foundation of Natural Science Foundation of Hubei Province(No.2020CFA099);the Innovation Group of Key Research and Development Program of Hubei Province(Nos.2021BAA208 and 2022BCA061);the Knowledge Innovation Project of Wuhan City(No.2022010801010303),National Key R&D Program of China(No.2022YFB2404800);the Key R&D Projects of Hubei Province(Nos.2022BCA061,2021BAA176);City University of Hong Kong Strategic Research Grant(SRG),Hong Kong,China(No.7005505);City University of Hong Kong Donation Research Grant(DON-RMG No.9229021)。

摘　　要：Silicon(Si)has mild discharge potential and high theoretical capacity,making it a highly desirable material for lithium-ion batteries(LIBs).Nevertheless,the excessive volume expansion,poor ion/electron conductiv ity and unstable solid electrolyte interface(SEI)hinde practical application to LIBs.Herein,the metallic antimony(Sb)stabilized porous Si(SiDSb)composite was prepared by magnesiothermic reduction of Sb_(2)O_(3)and Mg_(2)Si and chemical etching to remove the by-product of MgO.The highly conductive Sb nanodots embedded in the Si liga ments promote not only the formation of conductive and stable LiF-rich SEI,but also the electron/ion transpor ability of Si.Owing to the outstanding bulk/interface stability,excellent conductivity,as well as ideal porous structure,the SiDSb electrode demonstrates a capacity of820 mAh·g^(-1)after undergoing 320 turns at 1000 mA·g^(-1).Additionally,it exhibits a stable capacity of 675 m Ah·g^(-1)when tested at a higher current density of 5000 m A·g^(-1).The results reveal a viable solution to solve three problems at the same time,namely the poor conductivity,inferior SEI and excessive volume expansion of Si,boding well for the design of Si-based materials for high-energy LIBs.

关 键 词：Silicon Anodes Lithium-ion batteries ANTIMONY Solid electrolyte interphase 

分 类 号：TM912[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]