论文
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