Effect of temperature on formation and evolution of solid electrolyte in terphase on Si@Graphite@C anodes

作     者：Hong Dong Jie Wang Peng Wang Hao Ding Ru Song Ning-Shuang Zhang Dong-Ni Zhao Li-Juan Zhang Shi-You Li Hong Dong;Jie Wang;Peng Wang;Hao Ding;Ru Song;Ning-Shuang Zhang;Dong-Ni Zhao;Li-Juan Zhang;Shi-You Li

作者机构：College of Petrochemical TechnologyLanzhou University of TechnologyLanzhou 730050GansuChina Gansu Key Laboratory of Low-Carbon Energy and Chemical EngineeringLanzhou 730050GansuChina College of Chemistry and Chemical EngineeringQinghai University for NationalitiesXining 810007QinghaiChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第1期

页      面：190-200,I0006页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(51962019) the Major Science and Technology Projects of Gansu Province(18ZD2FA012) the Natural Science Foundation of Qinghai Province of China for Youth Project(2019-ZJ-938Q) the Qinghai Science and Technology Plan(2019-ZJ-7038) the Hongliu First-class Discipline Construction Program of Lanzhou University of Technology. 

主　　题：In-situ EIS Solid electrolyte in terphase Formation Evolution Si@Graphite@C anodes 

摘      要：Studies on the formati on and evolutio n of the solid electrolyte in terface(SEI)film under different ambient temperatures are important to understand the failure behavior of lithium-ion batteries(LIBs).Herein,in-situ electrochemical impedance spectroscopy(EIS)test is performed on the whole discharge process of Si@Graphite@C/Li cell at 0,25 and 55℃,respectively.Combining with scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy characterizations,it is found that the SEI film undergoes a complicated evolution process of pre-formation,self-improvement and gradual decay in succession at 25℃.Besides,due to the dissolution of organo-alkyl lithium at high temperature,the formed film is mainly composed of LiF,Li_(2)CO_(3) and other in organic salts,which helps to decrease the impedance.However,the electrolyte is consumed continuously on the new exposed in terface,leading to the degraded performance of the cell.Moreover,the dyn amic properties of Li^(+) ions are poor at low temperature,though the migration ability of Li^(+) ions in the solid phase can be improved as the cycle goes on.Therefore,the development and application of in-situ EIS tech no logy are expected to become an important means to explain the electrochemical performance of batteries.