A customized strategy to design intercalation-type Li-free cathodes for all-solid-state batteries
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Date
2023-01-10
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
Pairing Li-free transition-metal-based cathodes (MX) with Li-metal anodes is an emerging trend to overcome the energy-density limitation of current rechargeable Li-ion technology. However, the development of practical Li-free MX cathodes is plagued by the existing notion of low voltage due to the long-term overlooked voltage-tuning/phase-stability competition. Here, we propose a p-type alloying strategy involving three voltage/phase-evolution stages, of which each of the varying trends are quantitated by two improved ligand-field descriptors to balance the above contradiction. Following this, an intercalation-type 2H-V1.75Cr0.25S4 cathode tuned from layered MX2 family is successfully designed, which possesses an energy density of 554.3 Wh kg−1 at the electrode level accompanied by interfacial compatibility with sulfide solid-state electrolyte. The proposal of this class of materials is expected to break free from scarce or high-cost transition-metal (e.g. Co and Ni) reliance in current commercial cathodes. Our experiments further confirm the voltage and energy-density gains of 2H-V1.75Cr0.25S4. This strategy is not limited to specific Li-free cathodes and offers a solution to achieve high voltage and phase stability simultaneously. TheAuthor(s) 2023. Published byOxfordUniversity Press on behalf of China Science Publishing&Media Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License
Description
Keywords
Cathodes, Electric batteries, Ligands, Electrodes, Energy density, Physical properties, Energy storage
Citation
Wang, D., Yu, J., Yin, X., Shao, S., Li, Q., Wang, Y., Avdeev, M., Chen, L., & Shi, S. (2023). A customized strategy to design intercalation-type Li-free cathodes for all-solid-state batteries. National Science Review, 10(3). doi:10.1093/nsr/nwad010