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Interfacial instabilities in halide-based solid-state batteries
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DOI：10.1557/s43577-023-00607-3.png)
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Abstract
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All-solid-state batteries have emerged as a promising technology for energy storage, offering improved safety and potential for higher energy density. Halide-based batteries have gained popularity due to the advantageous characteristics of electrolytes, including decent ion conductivity, good formability, high-voltage stability, and moisture resistivity. Despite the impressive cycle life observed in halide-based batteries under high stack pressures or at elevated temperatures, poor cathode-electrolyte stabilities still pose a significant challenge that results in rapid capacity decay under ambient temperature and low pressure. The poor stability at the halide-anode interface further limits the choice of electrode materials for high-energy applications. This article presents a review of interfacial instability in halide-based solid-state batteries, addressing both the chemical, electrochemical, and mechanical origins of these instabilities at the cathode-electrolyte and anode-electrolyte interfaces. We also discuss state-of-the-art approaches to mitigate interfacial instabilities and highlight their limitations. Finally, we propose perspectives and future directions for resolving interfacial instabilities in halide-based solid-state batteries.
Keywords:
Solid-state battery
Halide electrolyte
Interface
(Electro)Chemical instability
Mechanical instability
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