Hydrides for solid-state batteries: A review

Solid-state batteries (SSBs) are one of the most promising candidates for the next generation energy storage devices due to their huge potential for higher safety and energy density. Polymers, oxides and sulfides have been extensively investigated as electrolytes and electrodes for SSBs. Recently, hydrides have attracted much attention as both electrolytes and electrodes for SSBs owing to the existence of unique H δ− in hydrides. In this review, we provide an overview of the borohydride-based solid electrolytes (SEs) as well as binary hydride- and alanate-based anode materials. Finally, perspectives on the design concept, processing technology and ion insertion/extraction mechanism are provided for the development of hydride-based key components towards practical high-performance SSBs.