Journal
CHEMICAL ENGINEERING JOURNAL
Volume 448, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137740
Keywords
Solid-state lithium batteries; Ceramic solid electrolytes; Interfacial engineering; In-situ polymerization; Gel-polymer electrolytes
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Funding
- Teli Young Scholars of Beijing Institute of Technology [51972029]
- Experimental Center of Advanced Materials in Beijing Institute of Technology
- National Natural Science Foun-dation of China
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Developed a high ionic conductivity and low activation energy LAGP ceramic solid electrolyte, modified its interface properties to stabilize the cycling life of lithium symmetric cells, and achieved superior electrochemical performance for solid-state lithium batteries with a LiFePO4 cathode.
A ceramic solid electrolyte of Li1.5Al0.5Ge1.5(PO4)(3) (LAGP) with high ionic conductivity (4.28 x 10(-4 )S cm(-1) at 30 degrees C) and low activation energy (0.25 eV) is prepared by a three-step method, and the interfacial properties of the ceramic solid electrolyte are further modified by an in-situ polymerization strategy with the formation of a gel-polymer electrolyte with the thickness of 8.85 mu m on the surface of LAGP. The presence of the gel-polymer electrolyte on the surface of LAGP inhibits the side reactions and the growth of lithium dendrites, as evidenced by the stable cycling of the lithium symmetric cells with the modified LAGP solid electrolyte for 1000 h at 25 degrees C. In addition, the high ionic conductivity and the stable interface of the modified LAGP solid electrolyte enable the solid-state lithium battery with a LiFePO4 cathode, exhibiting superior electrochemical performances which can run stably at 25 degrees C with initial discharge specific capacity of 159.8 mAh g(-1) at 0.1C.
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