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Highly Reversible Cuprous Mediated Cathode Chemistry for Magnesium Batteries.
- Source :
- Angewandte Chemie; 7/6/2020, Vol. 132 Issue 28, p11574-11579, 6p
- Publication Year :
- 2020
-
Abstract
- Sluggish kinetics and poor reversibility of cathode chemistry is the major challenge for magnesium batteries to achieve high volumetric capacity. Introduction of the cuprous ion (Cu+) as a charge carrier can decouple the magnesiation related energy storage from the cathode electrochemistry. Cu+ is generated from a fast equilibrium between copper selenide electrode and Mg electrolyte during standing time, rather than in the electrochemical process. A reversible chemical magnesiation/de‐magnesiation can be driven by this solid/liquid equilibrium. During a typical discharge process, Cu+ is reduced to Cu and drives the equilibrium to promote the magnesiation process. The reversible Cu to Cu+ redox promotes the recharge process. This novel Cu+ mediated cathode chemistry of Mg battery leads to a high reversible areal capacity of 12.5 mAh cm−2 with high mass loading (49.1 mg cm−2) of the electrode. 80 % capacity retention can be achieved for 200 cycles after a conditioning process. [ABSTRACT FROM AUTHOR]
- Subjects :
- CHEMISTRY
CATHODES
COPPER electrodes
ELECTRIC batteries
MAGNESIUM
Subjects
Details
- Language :
- English
- ISSN :
- 00448249
- Volume :
- 132
- Issue :
- 28
- Database :
- Complementary Index
- Journal :
- Angewandte Chemie
- Publication Type :
- Academic Journal
- Accession number :
- 144335940
- Full Text :
- https://doi.org/10.1002/ange.202002177