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

作者机构：State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Hubei Longzhong LaboratoryWuhan University of Technology(Xiangyang Demonstration Zone)Xiangyang 441000China Hainan InstituteWuhan University of TechnologySanya 572000China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术(英文版))

年 卷 期：2024年第191卷第24期

页      面：17-22页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

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) 

主　　题：Lithium-ion batteries Silicon anode Vanadium(Ⅲ)oxide Spray drying SEI layer 

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 ***,it is very important to construct functional coatings on nano-structured Si to buffer the volume change and improve the interface ***,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 *** 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 *** 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 *** 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.