Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 28, Pages 11483-11490Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202002560
Keywords
anions; magnesium-ion batteries; multi-electron reactions; rechargeable calcium batteries; VS4
Categories
Funding
- Bundesministerium fr Bildung und Forschung (BMBF) of Germany [03XP0208]
- European Unions Horizon 2020 research and innovation programme via the E-MAGIC project [824066]
- German Research Foundation (DFG) [390874152]
- Karlsruhe Nano Micro Facility (KNMF), a Helmholtz Research Infrastructure at Karlsruhe Institute of Technology (KIT)
Ask authors/readers for more resources
The development of multivalent metal (such as Mg and Ca) based battery systems is hindered by lack of suitable cathode chemistry that shows reversible multi-electron redox reactions. Cationic redox centres in the classical cathodes can only afford stepwise single-electron transfer, which are not ideal for multivalent-ion storage. The charge imbalance during multivalent ion insertion might lead to an additional kinetic barrier for ion mobility. Therefore, multivalent battery cathodes only exhibit slope-like voltage profiles with insertion/extraction redox of less than one electron. Taking VS4 as a model material, reversible two-electron redox with cationic-anionic contributions is verified in both rechargeable Mg batteries (RMBs) and rechargeable Ca batteries (RCBs). The corresponding cells exhibit high capacities of >300 mAh g(-1) at a current density of 100 mA g(-1) in both RMBs and RCBs, resulting in a high energy density of >300 Wh kg(-1) for RMBs and >500 Wh kg(-1) for RCBs. Mechanistic studies reveal a unique redox activity mainly at anionic sulfides moieties and fast Mg2+ ion diffusion kinetics enabled by the soft structure and flexible electron configuration of VS4.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available