Room-Temperature Anode-Less All-Solid-State Batteries via the Conversion Reaction of Metal Fluorides

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Lee, Jieun; Choi, Seung Ho; Im, Gahyeon; Lee, Kyu-Joon; Lee, Taegeun; Oh, Jihoon; Lee, Nohjoon; Kim, Hyuntae; Kim, Yunsung; Lee, Sangheon; Choi, Jang Wook

Issue Date
WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Materials, Vol.34 No.40, p. 2203580
All-solid-state batteries (ASSBs) that employ anode-less electrodes have drawn attention from across the battery community because they offer competitive energy densities and a markedly improved cycle life. Nevertheless, the composite matrices of anode-less electrodes impose a substantial barrier for lithium-ion diffusion and inhibit operation at room temperature. To overcome this drawback, here, the conversion reaction of metal fluorides is exploited because metallic nanodomains formed during this reaction induce an alloying reaction with lithium ions for uniform and sustainable lithium (de)plating. Lithium fluoride (LiF), another product of the conversion reaction, prevents the agglomeration of the metallic nanodomains and also protects the electrode from fatal lithium dendrite growth. A systematic analysis identifies silver (I) fluoride (AgF) as the most suitable metal fluoride because the silver nanodomains can accommodate the solid-solution mechanism with a low nucleation overpotential. AgF-based full cells attain reliable cycling at 25 degrees C even with an exceptionally high areal capacity of 9.7 mAh cm(-2) (areal loading of LiNi0.8Co0.1Mn0.1O2 = 50 mg cm(-2)). These results offer useful insights into designing materials for anode-less electrodes for sulfide-based ASSBs.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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