Stress-Regulation Design of Lithium Alloy Electrode toward Stable Battery Cycling

作     者：Chunhao Li Shuibin Tu Xin Ai Siwei Gui Zihe Chen Wenyu Wang Xiaoxiao Liu Yuchen Tan Hui Yang Yongming Sun Chunhao Li;Shuibin Tu;Xin Ai;Siwei Gui;Zihe Chen;Wenyu Wang;Xiaoxiao Liu;Yuchen Tan;Hui Yang;Yongming Sun

作者机构：Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mould TechnologyDepartment of MechanicsSchool of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074China 

出 版 物：《Energy & Environmental Materials》 (能源与环境材料（英文）)

年 卷 期：2023年第6卷第1期

页      面：184-191页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 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] 

基　　金：This work is financially supported by the Natural Science Foundation of China (Grant No.51802105,12172143,52002136) China Postdoctoral Science Foun-dation 

主　　题：chemo-mechanical simulation lithium alloy lithium-ion batteries mechanical lithography stress regulation 

摘      要：Metallic tin(Sn)foil is a promising candidate anode for lithium-ion batteries(LIBs)due to its metallurgical processability and high ***,it suffers low initial Coulombic efficiency and inferior cycling stability due to its uneven alloying/dealloying reactions,large volume change and stress,and fast electrode structural ***,we report an undulating LiSn electrode fabricated by a scalable two-step procedure involving mechanical lithography and chemical prelithiation of Sn *** the combination of experimental measurements and chemo-mechanical simulations,it was revealed the obtained undulating LiSn/Sn electrode could ensure better mechanical stability due to the pre-swelling state from Sn to Li x Sn and undulating structure of lithography in comparison with plane Sn,homogenize the electrochemical alloying/dealloying reactions due to the activated surface materials,and compensate Li loss during cycling due to the introduction of excess Li from Li_(x)Sn,thus enabling enhanced electrochemical *** cells consisting of undulating LiSn/Sn electrode with an active thickness of∼5 um displayed stable cycling over 1000 h at 1 mA cm^(-2) and 1 mAh cm^(-2) with a low average overpotential of15 *** paired with commercial LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)cathode with high mass loading of 15.8 mg cm^(-2),the full cell demonstrated a high capacity of 2.4 mAh cm^(-2) and outstanding cycling stability with 84.9% capacity retention at 0.5 C after 100 *** work presents an advanced LiSn electrode with stress-regulation design toward high-performance LIBs,and sheds light on the rational electrode design and processing of other high-capacity lithium alloy anodes.