Mitigating the capacity fading of Si nanoparticles through V_(2)O_(3) and carbon dual coatings  

作　　者：Ruhan He Hao Li Aoyuan Chen Liqiang Mai Liang Zhou 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [2]International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [3]Hubei Longzhong Laboratory,Wuhan University of Technology(Xiangyang Demonstration Zone),Xiangyang 441000,China [4]Hainan Institute,Wuhan University of Technology,Sanya 572000,China

出　　处：《Journal of Materials Science & Technology》2024年第24期17-22,共6页材料科学技术(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB3803501);the Key Research and Development Program of Hubei Province(No.2021BAA176);the Hainan Provincial Natural Science Foundation of China(No.522CXTD516);the Sanya Science and Education Innovation Park of Wuhan University of Technology(No.2022KFO027).

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 improve the interface stability.Herein,we successfully construct V_(2)O_(3) 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@V_(2)O_(3)@C manifests a high specific capacity of 2230 mAh g^(-1) after 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@V_(2)O_(3)@C than pristine Si.The V_(2)O_(3) and C dual coating layers not only ensure the Si nanoparticles with high structural stability by buffering volume expansion and preventing electrolyte penetration,but also guarantee a superior electron transport rate because of the metallic V_(2)O_(3) as well as the highly conductive carbon layers.

关 键 词：Lithium-ion batteries Silicon anode Vanadium(Ⅲ)oxide Spray drying SEI layer 

分 类 号：TG1[金属学及工艺—金属学]