期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 5, 页码 1412-1416出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811882
关键词
hydrostable cathodes; layered structures; sodium-ion batteries; zinc
资金
- Australian Renewable Energy Agency (ARENA) Project [G00849]
- Innovative Group of Guangdong Province [2014ZT05N013]
- National Natural Science Foundation of China [51632001]
Low-cost layered oxides free of Ni and Co are considered to be the most promising cathode materials for future sodium-ion batteries. Biphasic Na0.78Cu0.27Zn0.06Mn0.67O2 obtained via superficial atomic-scale P3 intergrowth with P2 phase induced by Zn doping, consisting of inexpensive transition metals, is a promising cathode for sodium-ion batteries. The P3 phase as a covering layer in this composite shows not only in excellent electrochemical performance but also its tolerance to moisture. The results indicate that partial Zn substitutes can effectively control biphase formation for improving the structural/electrochemical stability as well as the ionic diffusion coefficient. Based on in situ synchrotron X-ray diffraction coupled with electron-energy-loss spectroscopy, a possible Cu2+/3+ redox reaction mechanism has now been revealed.
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