Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 33, Pages 12378-12387Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c02362
Keywords
ionic conductivity; lithium ion transfer number; memory effect; electrochemical stability; interface resistance
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Funding
- ZiQoo Chemical Co., Ltd.
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Solid-state lithium batteries are highly promising for energy storage applications because of their high energy density and good safety. Herein, a novel solid electrolyte based on ionic-liquid- impregnated Li-Al layered double hydroxides (Li-IL@Li-Al LDH) is reported. Since the Li+ ions can be inserted into the vacant octahedral sites of the Li-Al LDH and the related anions intercalated into the interlayer for the charge balance, which can facilitate the transport of Li+ ions and avoid the interference of anions, the Li-IL@Li-Al LDH solid electrolyte with the optimized Li-IL/Li-Al LDH wight ratio of 2:1 exhibits a high ionic conductivity of 1.04 X 10(-3) S. cm(-1) with a Li+ transfer number of 0.35 at 40 degrees C. Moreover, this solid electrolyte demonstrates excellent nonflammability, good lithium stability, high electrochemical stability, and low interface resistance with electrodes. The fabricated LiFePO4/Li-IL@Li-Al LDH (2.0:1)/Li battery displays outstanding cyclability and rate capability at 40 degrees C, indicating that the Li-IL@Li-Al LDH SE should have great potential for applications in the solid-state lithium batteries.
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