Adjusting the solvation structure with tris(trimethylsilyl)borate additive to improve the performance of LNCM half cells  

作　　者：Jie Wang Hong Dong Peng Wang Xiao-Lan Fu Ning-Shuang Zhang Dong-Ni Zhao Shi-You Li Xiao-Ling Cui 

机构地区：[1]School of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,Gansu,China [2]Gansu Key Laboratory of Low-Carbon Energy and Chemical Engineering,Lanzhou 730050,Gansu,China [3]Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery,Lanzhou 730050,Gansu,China

出　　处：《Journal of Energy Chemistry》2022年第4期55-64,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(51962019);the Natural Science Foundation of Gansu Province(20JR5RA469);the Education Department of Gansu Province:"Star of Innovation"Project for Outstanding Graduate Students(2021CXZX-455);the Lanzhou University of Technology Hongliu First-class Discipline Construction Program。

摘　　要：Tris(trimethylsilyl)borate(TMSB) has been intensively studied to improve the performances of lithiumion batteries. However, it is still an interesting issue needed to be resolved for the research on the Li^(+) solvation structure affected by TMSB additive. Herein, the electrochemical tests, quantum chemistry calculations, potential-resolved in-situ electrochemical impedance spectroscopy measurements and surface analyses were used to explore the effects of Li^(+) solvation structure with TMSB additive on the formation of the cathode electrolyte interface(CEI) film in LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)/Li half cells. The results reveal that the TMSB additive is easy to complex with Li^(+) ion, thus weaken the intermolecular force between Li^(+) ions and ethylene carbonate solvent, which is benefit for the cycle performance. Besides, the changed Li^(+) solvation structure results in a thin and dense CEI film containing compounds with Si–O and B–O bonds which is favorable to the transfer of Li^(+) ions. As a result, the performances of the LNCM811/Li half cells are effectively improved. This research provides a new idea to construct a high-performance CEI film by adjusting the Li^(+) solvation structures.

关 键 词：Lithium-ion battery Solvation structure Tris(trimethylsilyl)borate Si-containing additive LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) Cathode electrolyte interface film 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]