Garnet-based solid lithium metal batteries with ultralong lifespan enabled by solvent-free trifluoroacetic acid-induced interfacial engineering

Garnet electrolyte-based solid-state lithium metal batteries (SLMBs) are attractive owing to their high energy density and high safety. However, garnet electrolytes are sensitive to humid air, forming Li 2 CO 3 -rich contaminants on the surface that trigger a high kinetic barrier and premature batte...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2024-06, Vol.12 (23), p.1383-1384
Main Authors: Hu, Xia, Wang, Yao, Guo, Weiqian, Tian, Yao, Zhang, Xiang, Kang, Feiyu, Zhou, Dong, Li, Baohua
Format: Article
Language:English
Subjects:
Batteries
Contaminants
Electrolytes
Garnets
Impurities
Life span
Lithium
Lithium batteries
Lithium carbonate
Lithium fluoride
Molten salt electrolytes
Solid electrolytes
Solid state
Solvents
Trifluoroacetic acid
Wettability
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Summary:Garnet electrolyte-based solid-state lithium metal batteries (SLMBs) are attractive owing to their high energy density and high safety. However, garnet electrolytes are sensitive to humid air, forming Li 2 CO 3 -rich contaminants on the surface that trigger a high kinetic barrier and premature battery failure. Herein, a straightforward "waste-to-treasure" strategy is proposed to transform Li 2 CO 3 on a Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) surface into LiF by solvent-free trifluoroacetic acid (TFA)-induced interfacial engineering. The as-formed LiF interfacial layer with electronically insulating nature effectively improves the interface wettability between the Li anode and LLZTO, reduces the interface resistance and produces a symmetric cell with an ultralong-lifespan of up to 10 000 h at 0.1 mA cm −2 . Furthermore, the SLMB paired with the LiFePO 4 cathode delivers a high capacity of 155.6 mA h g −1 at 0.5C and retains 78% of the initial capacity after 900 cycles. This study offers a facile strategy to overcome the limitations associated with surface impurities, addresses critical interface issues, and accelerates the practical application of garnet-type solid-state electrolytes in high-performance SLMBs. A waste-to-treasure strategy is proposed to transform contaminant Li 2 CO 3 on LLZTO surface into LiF by solvent-free TFA. The formed lithophilic LiF layer with high electron insulation contributes to the realization of ultralong life batteries.
ISSN:2050-7488
2050-7496
DOI:10.1039/d4ta01352b