Enabling Full Conversion Reaction with High Reversibility to Approach Theoretical Capacity for Sodium Storage

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...

Full description

Saved in:
Bibliographic Details
Published in:Advanced functional materials 2019-11, Vol.29 (46), p.n/a
Main Authors: Fang, Libin, Wang, Caiyun, Huangfu, Leilei, Bahlawane, Naoufal, Tian, He, Lu, Yunhao, Pan, Hongge, Yan, Mi, Jiang, Yinzhu
Format: Article
Language:English
Subjects:
Batteries
Conversion
conversion reactions
Doping
Electrode materials
Electrodes
Intercalation
intercalation reactions
Lithium
Materials science
metal sulfides
Reaction kinetics
Reaction mechanisms
Rechargeable batteries
Sodium
sodium storage
Sodium-ion batteries
theoretical capacity
Transition metals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. 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.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201906680