A Hydrostable Cathode Material Based on the Layered P2@P3 Composite that Shows Redox Behavior for Copper in High-Rate and Long-Cycling Sodium-Ion Batteries

Zichao Yan; Liang Tang; Yangyang Huang; Weibo Hua; Yong Wang; Rong Liu; Qinfen Gu; Sylvio Indris; Shu-Lei Chou; Yunhui Huang; Minghong Wu; Shi-Xue Dou

doi:10.1002/anie.201811882

A Hydrostable Cathode Material Based on the Layered P2@P3 Composite that Shows Redox Behavior for Copper in High-Rate and Long-Cycling Sodium-Ion Batteries

Angew Chem Int Ed Engl. 2019 Jan 28;58(5):1412-1416. doi: 10.1002/anie.201811882. Epub 2019 Jan 9.

Authors

Zichao Yan¹, Liang Tang², Yangyang Huang³, Weibo Hua⁴, Yong Wang⁵, Rong Liu⁶, Qinfen Gu⁷, Sylvio Indris⁴, Shu-Lei Chou¹, Yunhui Huang³, Minghong Wu², Shi-Xue Dou¹

Affiliations

¹ Institute for Superconducting and Electronic Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW, 2522, Australia.
² Shanghai Institute of Applied Radiation, Shanghai University, Shanghai, 200444, China.
³ Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.
⁴ Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), 76344, Eggenstein-Leopoldshafen, Germany.
⁵ School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
⁶ SIMS Lab Manager, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia.
⁷ Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria, 3168, Australia.

PMID: 30480349
DOI: 10.1002/anie.201811882

Abstract

Low-cost layered oxides free of Ni and Co are considered to be the most promising cathode materials for future sodium-ion batteries. Biphasic Na_0.78 Cu_0.27 Zn_0.06 Mn_0.67 O₂ 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 Cu^2+/3+ redox reaction mechanism has now been revealed.

Keywords: hydrostable cathodes; layered structures; sodium-ion batteries; zinc.

Abstract

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