Achieving high-energy and high-safety lithium metal batteries with high-voltage-stable solid electrolytes

In the pursuit of next-generation energy storage systems, solid-state lithium metal batteries (SSLMBs) that can match both high-voltage cathodes and lithium metal anodes have attracted considerable attention in both industry and academia due to their high-energy density, enhanced safety, and cycle-life benefits. However, SSLMBs suffer from severe degradation of solid electrolytes (SEs) along with the continuously increasing cutoff voltage. Consequently, designing a compatible SE is crucial for high-voltage SSLMBs. In this review, the recent developments of high-voltage SSLMBs in the field of SEs are summarized, including their fundamental understand-ing, interfacial degradation mechanisms, and application prospects. Moreover, we specifically highlight the design principles needed to achieve intrinsic and extrinsic stability for SEs under high voltage. Finally, a summary of the existing challenges and perspectives on the high-voltage-stable SEs and SSLMBs are also discussed with the aim of guiding the development of state-of-the-art SEs for future high-energy and high-safety SSLMBs.

Automated summary

In the pursuit of next-generation energy storage systems, solid-state lithium metal batteries (SSLMBs) have attracted considerable attention for their high-energy density, enhanced safety, and cycle-life benefits. However, the degradation of solid electrolytes (SEs) is a major concern in SSLMBs, especially at high voltages. This review summarizes recent developments in SEs for high-voltage SSLMBs, including their understanding, degradation mechanisms, and application prospects. Design principles for achieving stability in SEs under high voltage are highlighted, and challenges and perspectives on high-voltage-stable SEs and SSLMBs are discussed.