Mitigating the capacity fading of Si nanoparticles through V2O3 and carbon dual coatings

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外文摘要：Nano-structured silicon(Si)has demonstrated high capacity for lithium storage;however,it suffers from unsatisfactory cycling stability caused by large volume change and poor interface stability.Thus,it is very important to construct functional coatings on nano-structured Si to buffer the volume change and im-prove the interface stability.Herein,we successfully construct V2O3 and carbon(C)dual-layer coatings on Si nanoparticles with ultrathin and uniform thickness using a facile spray drying and chemical vapour deposition method.The as-prepared Si@V2O3@C manifests a high specific capacity of 2230 mAh g-1 af-ter 100 cycles under the current density of 200 mA g-1,showing its promising application prospect in lithium storage.In situ electrochemical impedance spectroscopy(EIS)results at different lithiation states and different cycles show a more stable interface resistance of Si@V2O3@C than pristine Si.The V2O3 and C dual coating layers not only ensure the Si nanoparticles with high structural stability by buffering vol-ume expansion and preventing electrolyte penetration,but also guarantee a superior electron transport rate because of the metallic V2O3 as well as the highly conductive carbon layers.

外文关键词：

Lithium-ion batteriesSilicon anodeVanadium(Ⅲ)oxideSpray dryingSEI layer

作者：

Ruhan He、Hao Li、Aoyuan Chen、Liqiang Mai、Liang Zhou

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作者单位：

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China

State Key Laboratory of Ad-vanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

Hubei Longzhong Laboratory,Wuhan University of Technology(Xiangyang Demonstration Zone),Xiangyang 441000,China

Hainan Institute,Wuhan University of Technology,Sanya 572000,China

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基金：

National Key Research and Development Program of ChinaKey Research and Development Program of Hubei ProvinceHainan Provincial Natural Science Foundation of ChinaSanya Science and Education Innovation Park of Wuhan University of Technology

项目编号：

2022YFB38035012021BAA176522CXTD5162022KFO027

出版年：

2024

DOI：

10.1016/j.jmst.2023.12.034

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.191(24)