( Invited ) Discovery of Selectively Etched Metastable Layered Oxides for Electrochemical Energy Storage

Le résumé fourni par la source

Lithium-ion batteries have revolutionized wireless electronics and are now transforming the automotive and stationary energy storage industries. The next level of adoption demands lower cost, safer supply chains, and higher energy density. New materials can potentially tackle these challenges. However, the development of new intercalation materials has slowed, as decades of research have exhausted available material options. In this scenario, thermodynamically metastable phases have emerged as an underexplored materials space. One promising approach to exploring metastable materials is selective etching, which has enabled the discovery of over 50 MXenes. These 2D layered materials are promising for energy storage performance due to their high ionic and electronic conductivities and their redox-active transition-metal centers. Here, we show that this method can be applied to oxides, such as Aurivillius phases, to discover new materials for energy storage, including bilayer tungsten oxide monohydrate. In an aqueous acidic electrolyte, the bilayer tungsten oxide monohydrate shows a specific capacity of 70 mAh g -1 and a capacity retention of ≈80% at 1000 mV s –1 (1.5-s discharge time) as compared to 1 mV s –1 (≈16-min discharge time) with cyclability for over 100,000 cycles. These results highlight the use of selective etching to synthesize metastable transition metal oxides for energy storage.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.