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Facile Preparation of CuCo 2 S 4 /Cu 7.2 S 4 Nanocomposites as High‐Performance Cathode Materials for Rechargeable Magnesium Batteries **
Author(s) -
Zhang Qin,
Hu Yaobo,
Wang Jun,
Dai Yuanxiao,
Pan Fusheng
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202100160
Subject(s) - cathode , materials science , electrochemistry , magnesium , nanocomposite , energy storage , chemical engineering , nanotechnology , electrode , metallurgy , chemistry , thermodynamics , power (physics) , physics , engineering
Rechargeable magnesium batteries (RMBs) have been considered a promising energy‐storage device due to their high energy density and high safety, but they still suffer from a lack of high‐rate performance and cycle performance of the cathode. Nanosized CuCo 2 S 4 /Cu 7.2 S 4 composites have been synthesized for the first time by a facile solvothermal method. Herein, the magnesium ion storage behavior when applied in the cathode for RMBs is discussed. Electrochemical results demonstrated that the CuCo 2 S 4 /Cu 7.2 S 4 composites exhibit a high initial discharge capacity of 256 mAh g −1 at 10 mA g −1 and 123 mAh g −1 at 300 mA g −1 at room temperature and an outstanding long‐term cyclic stability over 300 cycles at 300 mA g −1 . Furthermore, the electrochemical storage mechanism demonstrated that the storage process of magnesium ion in the CuCo 2 S 4 /Cu 7.2 S 4 cathode is mainly driven by strong pseudocapacitive effects.