Recent Advances in Stability Issues of Inorganic Solid Electrolytes and Composite Solid Electrolytes for All-Solid-State Batteries

The development of solid-state batteries has become one of the most promising directions in rechargeable secondary batteries due to their considerable energy densities and favorable safety. However, solid-state batteries with higher energy density and more durable and stable cycle life should be developed for large-scale energy storage and adaption to the rapidly increasing lithium battery production and sales market. Although inorganic solid electrolytes (ISEs) and composite solid electrolytes (CSEs) are relatively advantageous solid-state electrolytes, they also face severe challenges. This review summarizes the main stability issues related to chemical, mechanical, thermal, and electrochemical aspects faced by ISEs and CSEs. The corresponding state-of-the-art improvement strategies have been proposed, including filling of modified particles, electrolyte pore adjustment, electrolyte internal structure arrangement, and interface modification.

Automated summary

The development of solid-state batteries with considerable energy densities and favorable safety is highly promising. However, the challenge lies in developing solid-state batteries with higher energy density and more durable and stable cycle life to meet the demand for large-scale energy storage and the rapidly growing lithium battery market. Inorganic solid electrolytes (ISEs) and composite solid electrolytes (CSEs) are advantageous solid-state electrolytes but also face stability issues. Various improvement strategies, such as modified particle filling, electrolyte pore adjustment, electrolyte internal structure arrangement, and interface modification, have been proposed.