Aqueous ammonium ion storage materials: A structure perspective.

This reviews the latest progress in the host structure, storage mechanism, electrolytes, and devices of aqueous ammonium ion storage devices from a structural perspective, and proposes research prospects and promising improvement strategies. [Display omitted] • Summarized the host materials of aqueous ammonium ions from a structural perspective, including storage mechanisms and improvement strategies. • The electrolytes used for NH 4 + storage was classified based on storage type and concentration, and the problems and solutions faced were summarized. • Summarized the advanced progress of various NH 4 + storage devices using NH 4 + as carriers. Aqueous ammonium ion energy storage devices have received widespread attention recently due to their high safety, fast diffusion kinetics, and unique tetrahedral structure with abundant charge carriers (NH 4 +) resources. Although many NH 4 + storage electrode materials have been frequently proposed, there are still face explorations and challenges in terms of performance improvement and storage mechanisms. Therefore, there is an urgent need to develop high-performance NH 4 + storage electrode materials and explore deeper mechanisms. This review comprehensively classifies and compares NH 4 + storage electrode materials from a structural perspective, and reviews the influence of electrolyte composition and concentration on NH 4 + storage systems. In addition, this review also elaborates on the current limitations and possible solutions. Finally, common NH 4 + storage devices are summarized, and their future development prospects and challenges are discussed. [ABSTRACT FROM AUTHOR]