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

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

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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)hinder practical application to LIBs.Herein,the metallic antimony(Sb)stabilized porous Si(Si-Sb)composite was prepared by magnesiothermic reduction of Sb2O3 and Mg2Si 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 transport ability of Si.Owing to the outstanding bulk/interface stability,excellent conductivity,as well as ideal porous structure,the Si-Sb electrode demonstrates a capacity of 820 mAh·g-1 after undergoing 320 turns at 1000 mA·g-1.Additionally,it exhibits a stable capacity of 675 mAh·g-1 when tested at a higher current density of 5000 mA·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.

SiliconAnodesLithium-ion batteriesAntimonySolid electrolyte interphase

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

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The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology,Wuhan University of Science and Technology,Wuhan 430081,China

Wuhan National Laboratory for Optoelectronics(WNLO),School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China

Department of Physics,Department of Materials Science &Engineering,and Department of Biomedical Engineering,City University of Hong Kong,Hong Kong 999077,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBasic Research Program of Shenzhen Municipal Science and Technology Innovation CommitteeOutstanding Youth Foundation of Natural Science Foundation of Natural Science Foundation of Hubei ProvinceInnovation Group of Key Research and Development Program of Hubei ProvinceInnovation Group of Key Research and Development Program of Hubei ProvinceKnowledge Innovation Project of Wuhan CityNational Key R&D Program of ChinaKey R&D Projects of Hubei ProvinceKey R&D Projects of Hubei ProvinceCity University of Hong Kong Strategic Research Grant(SRG)Hong Kong,ChinaCity University of Hong Kong Donation Research Grant

51974208U200313052002297U2004120JCYJ202103241416130322020CFA0992021BAA2082022BCA06120220108010103032022YFB24048002022BCA0612021 BAA 1767005505DON-RMG 9229021

2024

10.1007/s12598-024-02632-w

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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