Journal
ENERGY STORAGE MATERIALS
Volume 14, Issue -, Pages 361-366Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2018.06.003
Keywords
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Funding
- National Key Basic Research Program of China [2014CB932400]
- National Natural Science Foundation of China [51232005, 51372131, U1401243, 51672156]
- Shenzhen Technical Plan Project [JCYJ 20150529164918735, KQJSCX20160226191136, JCYJ20170412170911187]
- Guangdong Technical Plan Project [2015TX01N011]
- Production-study research cooperation project of Guangdong province [2014B090901021]
- International Collaboration Project of Tsinghua University Initiative Scientific Research Program [20173080001]
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Here we report a high-capacity cathode, Na2Mn0.33+Mn2.74+O6.85, based on simultaneous cationic (Mn4+/Mn3+) and anionic (O2-/(O-2)(n-)) redox process in Na-Mn-O system for Na-ion batteries (NIBs). An obvious voltage plateau at similar to 4.2 V vs. Na+/Na is reversibly presented during Na+ deinsertion/insertion demonstrated by XPS analysis of the participation of oxygen redox. This cathode delivers similar to 213 mA h g(-1) in the voltage range of 1.5-4.5 V composed of two voltage plateaus from both cationic and anionic redox reaction. The two voltage plateaus exhibit the reversible phase transition upon Na+ insertion/deinsertion corresponding to a solid-solution region (high plateau) and a two-phase region (low plateau), respectively. The results indicate that anionic redox activity is available to develop high-capacity cathodes for NIBs.
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