Enabling Full Conversion Reaction with High Reversibility to Approach Theoretical Capacity for Sodium Storage. (6th September 2019)

• Record Type: Journal Article
• Authors: Fang, Libin; Wang, Caiyun; Huangfu, Leilei; Bahlawane, Naoufal; Tian, He; Lu, Yunhao; Pan, Hongge; Yan, Mi; Jiang, Yinzhu
• Is Part Of: Advanced functional materials. Volume 29:Number 46(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-06
• Subjects: conversion reactions -- intercalation reactions -- metal sulfides -- sodium storage -- theoretical capacity; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201906680
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Conversion‐type electrode materials are emerging as promising candidates for high‐energy rechargeable batteries, owing to their substantially higher theoretical capacity relative to intercalation‐based materials. Nevertheless, the full benefit from conversion‐type electrode materials remains out of reach in sodium‐ion batteries, due to the inadequate conversion reaction toward sodium and the poor reversibility during desodiation. Here, a full conversion reaction with high reversibility is demonstrated through promoting the initial sodium intercalation and subsequent reconversion kinetics by transition metal doping. The doping‐induced lowering of the sodium intercalation energy in thermodynamics effectively drives the full conversion reaction, while the metal transition of the doped element enhances reconversion kinetics in achieving high reversibility. The obtained results open a new avenue for the development of high‐performance conversion‐type electrodes and provide a novel understanding of the conversion reaction mechanism. Abstract : Full conversion and high reversibility in metal sulfides for sodium storage are reported. As a result, the doped metal sulfides successfully approach their theoretical capacity limits that have not been previously reported for sodium storage. This work provides new insights toward the solution of the conversion reaction adequacy and reversibility issues of conversion‐type materials for rechargeable batteries.