Understanding and unveiling the electro-chemo-mechanical behavior in solid-state batteries

Abstract

Solid-state batteries (SSBs) are attracting growing interest as long-lasting, thermally resilient, and high-safe energy storage systems. As an emerging area of battery chemistry, there are many issues with SSBs, including strongly reductive lithium anodes, oxidized cathodes (state of charge), the thermodynamic stability limits of solid-state electrolytes (SSEs), and the ubiquitous and critical interfaces. In this Review, we provided an overview of the main obstacles in the development of SSBs, such as the lithium anode|SSEs interface, the cathode|SSEs interface, lithium-ion transport in the SSEs, and the root origin of lithium intrusions, as well as the safety issues caused by the dendrites. Understanding and overcoming these obstacles are crucial but also extremely challenging as the localized and buried nature of the intimate contact between electrode and SSEs makes direct detection difficult. We reviewed advanced characterization techniques and discussed the complex ion/electron-transport mechanism that have been plaguing electrochemists. Finally, we focused on studying and revealing the coupled electro-chemo-mechanical behavior occurring in the lithium anode, cathode, SSEs, and beyond.

Keywords

advanced characterization techniques / chemo-mechanical effects / interface

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