Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 5, Pages 1412-1416Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811882
Keywords
hydrostable cathodes; layered structures; sodium-ion batteries; zinc
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Funding
- Australian Renewable Energy Agency (ARENA) Project [G00849]
- Innovative Group of Guangdong Province [2014ZT05N013]
- National Natural Science Foundation of China [51632001]
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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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