期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 28, 页码 11477-11482出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202002177
关键词
cathodes; cuprous ions; energy storage mechanism; magnesium batteries; solution electrochemistry
资金
- National Key R&D Program of China [2018YFB0104300]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA22010600]
- National Natural Science Foundation for Distinguished Young Scholars of China [51625204, 21975274]
- Youth Innovation Promotion Association of CAS [2016193]
- Key Research and Development Plan of Shandong Province P. R. China [2018GGX104016]
- National Natural Science Foundation of China [U1706229, 21805157]
- Key Program of the Chinese Academy of Sciences - QIBEBT [KFZDSW-414, ZZBS201808]
- Shandong Provincial Natural Science Foundation [ZR2018BEM011]
- Qingdao Applied Basic Research Program (19-6-2-12-cg) [20170287]
- Max Planck-POSTECH-Hsinchu Center for Complex Phase Materials
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.
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