Hierarchical pomegranate-structure design enables stress management for volume release of Si anode

作     者：Fang Di Zhenxing Wang Chong Ge Lixiang Li Xin Geng Chengguo Sun Haiming Yang Weimin Zhou Dongying Ju Baigang An Feng Li Fang Di;Zhenxing Wang;Chong Ge;Lixiang Li;Xin Geng;Chengguo Sun;Haiming Yang;Weimin Zhou;Dongying Ju;Baigang An;Feng Li

作者机构：Key Laboratory of Energy Materials and Electrochemistry Liaoning ProvinceSchool of Chemical EngineeringUniversity of Science and Technology LiaoningAnshan 114051China Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China Jihua LaboratoryGuangdong ProvinceFoshan 528200China 

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

年 卷 期：2023年第157卷第26期

页      面：1-10页

核心收录：

学科分类：0808[工学-电气工程] 0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：support by the NSFC Nos.51972156,51872131,51672117,51672118,22209055 CPSF No.2022M721330 Distin-guished Professor of Liaoning Province(2017)are acknowledged 

主　　题：Stress management Silicon anode Hierarchical structure Covalent bonding Volume release 

摘      要：Si is a promising anode material for lithium-ion batteries owing to its high theoretical ***-ever,large stress during(de)lithiation induces severe structural pulverization,electrical contact failure,and unstable solid-electrolyte interface,which hampers the practical application of Si ***,a Si-based anode with a hierarchical pomegranate-structure(HPS-Si)was designed to modulate the stress variation,and a sub-micronized Si-based sphere was assembled by the nano-sized Si nanospheres with sub-nanometer-sized multi-phase modification of the covalently linked SiO_(2-x),SiC,and *** sub-micronized HPS-Si stacked with Si nanospheres can avoid agglomerates during cycling due to the high surface energy of ***,the reasonable pore structure from SiO_(2) reduction owing to density difference is enough to accommodate the limited volume *** Si spheres with a size of about 50 nm can prevent ***_(2-x),and SiC as flexible and rigid layers,have been syner-gistically used to reduce the surface stress of conductive carbon layers to avoid *** covalent bonding immensely strengthens the link of the modification with Si nanospheres,thus resisting stress ***,a full cell comprising an HPS-Si anode and a LiCoO_(2) cathode achieved an energy density of 415 Wh kg^(-1) with a capacity retention ratio of 87.9%after 300 cycles based on the active *** is anticipated that the hierarchical pomegranate-structure design can provide inspiring insights for further studies of the practical application of silicon anode.