期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 6, 页码 3576-3583出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta11311e
关键词
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资金
- National Key R&D Program of China [2018YFB0905400]
- National Natural Science Foundation of China [21875196, 21935009, 21761132030, U1732121]
- Science and Technology Planning Projects of Fujian Province, China [2019H0003]
- Xiamen Science and Technology Plan Project [3502Z20193024]
In this study, an ultrathin insulating LiF coating was proposed to inhibit Li dendrite formation in all-solid-state lithium metal batteries, showing positive results. It was found that the homogeneous LiF interfacial layer can promote the contact between Li metal and LLZTO electrolyte, enhancing uniform lithium plating/stripping processes.
The electronic conductivity of solid electrolytes, which plays an important role in inducing Li dendrite deposition, is a key obstacle to the practical application of Li metal in all-solid-state lithium metal batteries. Herein, an ultrathin insulating LiF coating with controllable thickness is proposed as an electronic isolation layer to inhibit the formation of Li dendrites. The homogeneous LiF interfacial layer can effectively facilitate the physical contact of the Li metal and LLZTO electrolyte and promote uniform Li plating/stripping. In contrast to the inhomogeneous lithium nucleation and dendritic lithium growth in an unmodified LLZTO electrolyte induced by electron beam irradiation, dendritic Li deposition is efficiently inhibited on LiF coated LLZTO. The Li|0.5LF-LLZTO|Li symmetric cell exhibits a low interfacial impedance of 12.7 ohm cm(2) and stable Li plating/stripping without lithium penetration, over 1500 hours at 0.2 mA cm(-2) and 300 hours at 0.4 mA cm(-2). Besides, the Li|0.5LF-LLZTO|LiCoO2 full cell also shows excellent long-term cycling stability with a high capacity retention of 76.8% after 2500 cycles at 1C. Our results reveal the importance of tuning the interface modification layer properties to guide the uniform lithium plating toward suppressing Li dendrite formation in solid electrolytes.
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