Highly Reversible Cuprous Mediated Cathode Chemistry for Magnesium Batteries
| 发表年度： |
2020 |
| 期： |
28 |
| 卷： |
59 |
| 页： |
11477-11482 |
| 摘要： |
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. |
| 刊物名称： |
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION |
| 影响因子： |
12.257 |
