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A High‐Rate Rechargeable Mg Battery Based on AgCl Conversion Cathode with Fast Solid‐State Mg 2+ Diffusion Kinetics
Author(s) -
Li Xue,
Zhang Yujie,
Shen Jingwei,
Cao Shun-an,
Li Ting,
Xu Fei
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900454
Subject(s) - cathode , anode , battery (electricity) , diffusion , materials science , energy storage , electrochemistry , kinetics , chemical engineering , electrode , transition metal , potassium ion battery , metal , nanotechnology , chemistry , metallurgy , thermodynamics , catalysis , lithium vanadium phosphate battery , organic chemistry , power (physics) , physics , quantum mechanics , engineering
Rechargeable Mg batteries are attractive candidates for large‐scale energy storage batteries with high safety due to the low‐cost and non‐dendritic metallic Mg anode. However, exploring high‐performance cathode materials is blocking their development. Herein, a high‐rate rechargeable Mg battery is established with a AgCl cathode, delivering a high reversible capacity of 70.3 mAh g −1 at 100 mA g −1 , an outstanding rate capability of 32.6 mAh g −1 at 1000 mA g −1 , and a superior long‐term cyclability over 500 cycles. Further investigation of the mechanism demonstrates that a conversion reaction takes place between AgCl and metallic Ag 0 for the cathode. The solid‐state Mg 2+ diffusion coefficient is as high as 8.1 × 10 −11 cm 2 s −1 , which would be the reason for the high rate capability. The current study reveals significant insights to select promising Mg‐storage conversion cathodes by a combination of soft anions and soft transition‐metal cations.