A CaI 2 -Based Electrolyte Enabled by Borate Ester Anion Receptors for Reversible Ca-Organic and Ca-Se Batteries.

Autor: Hou Z; Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, 999077, China.; Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China., Zhou R; Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, 999077, China., Liu K; Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China., Zhu J; Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China., Zhang B; Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, 999077, China.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Sep 20, pp. e202413416. Date of Electronic Publication: 2024 Sep 20.
DOI: 10.1002/anie.202413416
Abstrakt: Passivating solid electrolyte interphases (SEIs) in Ca metal anodes constitute a long-standing challenge, as they block Ca 2+ transport and inhibit reversible Ca deposition/stripping. Current solutions focus primarily on boron/aluminum-based electrolytes to mitigate such interfacial issues by producing Ca 2+ -conductive species, yet the complex synthetic procedure of these salts restricts the widespread application. Moreover, whether any inorganic phases possess decent Ca 2+ conductivity within SEIs remains ambiguous. Herein, we report that a commercially available CaI 2 -dimethoxyethane electrolyte supports reversible Ca/Ca 2+ redox reactions via forming CaI 2 -involved SEI, inspired by our density functional theory calculations where CaI 2 species is predicted to possess the lowest Ca 2+ diffusion barrier among a range of inorganic phases. We further materialize this finding by introducing a serial of borate ester anion receptors, resulting in the formation of CaI 2 /borides hybrid SEIs with an enhanced Ca 2+ conductivity. Consequently, the resultant electrolytes realize a 7-fold reduction in deposition/stripping overpotential compared to anion receptor-free one, allowing for the construction of reversible Ca-metal full cells with high-capacity selenium and organic cathodes.
(© 2024 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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