Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 21, Pages 6165-6171Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm502481b
Keywords
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Funding
- Global Frontier R&D Program on Center for Hybrid Interface Materials (HIM) - Ministry of Science, ICT & Future Planning [2013M3A6B1078875]
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energy [20124010203310]
- National Research Foundation of Korea [2013M3A6B1078875, 22A20130012424] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work we report Na[Li-0.05(Ni0.25Fe(0.25)Mn(0.5))(0.95)]O2 layered cathode materials that were synthesized via a coprecipitation method. The Na[Li-0.05(Ni(0.25)Fe0.25Mn(0.5))(0.95)]O-2 electrode exhibited an exceptionally high capacity (180.1 mA h g1 at 0.1 C-rate) as well as excellent capacity retentions (0.2 C-rate: 89.6%, 0.5 C-rate: 92.1%) and rate capabilities at various C-rates (0.1 C-rate: 180.1 mA h g1, 1 C-rate: 130.9 mA h g1, 5 C-rate: 96.2 mA h g1), which were achieved due to the Li supporting structural stabilization by introduction into the transition metal layer. By contrast, the electrode performance of the lithium-free Na[Ni0.25Fe0.25Mn0.5]O-2 cathode was inferior because of structural disintegration presumably resulting from Fe3+ migration from the transition metal layer to the Na layer during cycling. The long-term cycling using a full cell consisting of a Na[Li-0.05(Ni0(.25)Fe(0.25)Mn(0.5))(0.95)]O-2 cathode was coupled with a hard carbon anode which exhibited promising cycling data including a 76% capacity retention over 200 cycles.
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