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

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Journal of Energy Chemistry 2022年第4期31卷 55-64页

作者： Jie Wang Hong Dong Peng Wang Xiao-Lan Fu Ning-Shuang Zhang Dong-Ni Zhao Shi-You Li Xiao-Ling Cui School of Petrochemical Technology Lanzhou University of TechnologyLanzhou 730050GansuChina Gansu Key Laboratory of Low-Carbon Energy and Chemical Engineering Lanzhou 730050GansuChina Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery Lanzhou 730050GansuChina

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

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