A Tip-Inhibitor Interphase Embedded with Soluble Polysulfides for High-Voltage Li Metal Batteries

作     者：Xueyang Cui Jiancong Cheng Chen Li Zongqiang Sun Kaixuan Li Yajing Wang Xiaoxiang Fan Shuai Tang Xiaodong Lin Ruming Yuan Bingwei Mao Mingsen Zheng Quanfeng Dong Xueyang Cui;Jiancong Cheng;Chen Li;Zongqiang Sun;Kaixuan Li;Yajing Wang;Xiaoxiang Fan;Shuai Tang;Xiaodong Lin;Ruming Yuan;Bingwei Mao;Mingsen Zheng;Quanfeng Dong

作者机构：State Key Laboratory of Physical Chemistry of Solid SurfacesDepartment of ChemistryCollaborative Innovation Center of Chemistry for Energy Materials(i-Ch EM)Engineering Research Centre of Electrochemical Technologies of Ministry of EducationCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of ChemistryZhengzhou UniversityZhengzhou 450001China 

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

年 卷 期：2023年第6卷第4期

页      面：157-165页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0703[理学-化学] 

基　　金：financial support from the NSFC projects(U1805254 21773192 22072117 and 22179112) 

主　　题：carbonate-based electrolyte free-dendrite high reversibility high-voltage battery lithium metal anode 

摘      要：The high-voltage battery has now become a goal in order to meet the demands for high energy density.However,the severe side reactions between Li metal and carbonate-based electrolytes in this system result in unstable interphase,leading to non-uniform Li-ion flux and thus aggravating the dendrite growth of Li.The protect interphase,traditional solid electrolyte interface(SEI),is a loose solid layer consisted of many components,which generally does not possess the function of preventing the lithium budding.Herein,based on polysulfide solubility in ester,we proposed a strategy to eliminate the dendrite by constructing a unique SEI in which the dynamic polysulfides were in situ formed and encapsuled.For this purpose,a 2-fluorophenylsulfur pentafluoride(2-FSPF)was employed as an additive in carbonate-based electrolyte that can be decomposed electrochemically during battery operation to form such a polysulfide-rich interphase.These polysulfides with certain fluidity can adhere to dynamically the budding tip of Li metal,as a so-called tip-inhibitor,when the local current density of the tip rising,thus to hinder Li^(+)diffusion toward the tip,resulting in inhibiting the further growth of Li dendrites and leveling the Li deposition.At the current density of 1 mA cm^(-2),the average Coulombic efficiency of Li//Cu cells is as high as 98.39%during 600 cycles,and the stable cycling of Li//Li symmetric cell reaches 3500 h.Furthermore,due to the high anodic stability,the Li//high-voltage LiCoO_(2)(LCO)full cells and Li–O_(2)battery achieve excellent cycle performance with lean electrolyte.