# Toward safer solid-state lithium metal batteries: a review

## TL;DR

This review highlights overlooked safety issues in solid-state lithium batteries and suggests ways to improve their safety.

## Contribution

The paper identifies and addresses potential safety concerns in SSLMBs that are often ignored.

## Key findings

- SSLMBs have potential safety issues despite the common belief that they are inherently safe.
- Several aspects of SSLMBs can raise safety concerns, with corresponding solutions proposed.
- The review offers perspectives for developing SSLMBs with ultra-high safety.

## Abstract

The solid-state lithium metal battery (SSLMB) is one of the most optimal solutions to pursue next-generation energy storage devices with superior energy density, in which solid-state electrolytes (SSEs) are expected to completely solve the safety problems caused by direct use of a lithium metal anode. Most previous work has mainly focused on improving the electrochemical performance of SSLMBs, but the safety issues have been largely ignored due to the influence of the stereotype that batteries with SSEs are always safe. In the actual research process, however, some potential dangers of SSLMBs have been gradually revealed, so extra attention should be paid to this issue. This minireview summarizes several aspects that could raise safety concerns and provides a brief overview of the corresponding solutions to each aspect. Finally, general conclusions and perspectives on the research of SSLMBs with ultra-high safety are presented.

This minireview summarizes several potential safety issues for solid-state lithium batteries, and the general conclusion and perspective on the research of solid-state lithium batteries with ultra-high safety are presented.