Decorating local Li plus solvation structure and optimizing solid electrolyte interphase with potassium trifluoroacetate for dendrites-free lithium metal anodes
文献类型： 外文期刊
作者： Zeng, T. 1 ; Shu, C. 1 ; Yan, Y. 1 ; Du, D. 1 ; Xu, H. 1 ; Wu, L. 2 ; Wen, X. 1 ; Liu, S. 1 ; Tian, G. 1 ; Wang, X. 1 ; Zeng, Y. 1 ;
作者机构： 1.Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, 1 Dongsanlu, Chengdu 610059, Sichuan, Peoples R China
2.Chinese Acad Fishery Sci, Beijing 100141, Peoples R China
关键词： Electrolyte additive; Potassium tri fluoroacetate; Li plus solvation environment; Electrode -electrolyte interphase; Dendrites -free Li deposition
期刊名称：MATERIALS TODAY NANO （ 影响因子：10.3； 五年影响因子：10.6 ）
ISSN： 2588-8420
年卷期： 2023 年 23 卷
页码：
收录情况： SCI
摘要： Fabricating a stable and robust solid electrolyte interphase to realize the dendrites-free lithium (Li) deposition morphology in the existing commercial electrolytes remains challenging. Here, the cost-effective potassium trifluoroacetate is proposed as an electrolyte additive, in which TFA- anions have the capability to involve in constructing solid electrolyte interphase with abundant inorganic species by modulating local Li+ solvation structure. It is found that TFSI- and NO3- anions in the electrolyte can be recruited into Li+ primary solvent sheath to replace partial solvent molecules confirmed by classical molecular dynamic simulations. This is due to the strong polar interaction between TFA- anions and Li+, which is favorable for weakening the coordination of solvent molecules proved by density functional theory calculation. Besides, with the assistance of electrostatic shielding of K+, the Li deposition morphology is greatly improved. Benefiting from the potassium trifluoroacetate additive, Li+ trans-ference number (tLi+) of 0.68, considerable ionic conductivity (sLi+) of 8.93 x 10-4 S cm-1, and stable cycling over 400 h at 1.0 mA cm-2 are obtained. Moreover, the full cells coupling with LiFePO4 cathode exhibit a low overpotential of 212.41 mV and high capacity retention of 87.67% after 283 cycles under the current density of 1.0 C.& COPY; 2023 Elsevier Ltd. All rights reserved.
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