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Issue 31, 2015
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Designing an advanced P2-Na0.67Mn0.65Ni0.2Co0.15O2 layered cathode material for Na-ion batteries

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Abstract

A high performance layered P2-Na0.67Mn0.65Ni0.2Co0.15O2 cathode material for sodium ion batteries with high rate capability and excellent long-life cyclic performance has been successfully designed and synthesized by a simple sol–gel method. In comparison with the reported Na0.7MnO2, the designed P2-Na0.67Mn0.65Ni0.2Co0.15O2 cathode material can be charged and discharged in an extended voltage range of 1.5–4.2 V and shows reversible capacities of 155, 144, 137, 132 and 126 mA h g−1 at different current densities of 12, 24, 48, 120 and 240 mA g−1, respectively. Even at high current densities of 480 (2C), 1200 (5C) and 1920 mA g−1 (8C) it can still deliver capacities of 117, 93 and 70 mA h g−1, respectively, which are much higher than those of the recently reported Na0.5[Ni0.23Fe0.13Mn0.63]O2. In addition, the Na0.67Mn0.65Ni0.2Co0.15O2 cathode material also displays an excellent capacity retention ca. 85% and 78% after 100 cycles at 0.05C and 0.5C, respectively. It is also proposed that Mn4+ may be “activated” in a low voltage range, especially below 2.0 V, which contributes to the additional capacity. The Na-ion diffusion coefficient, DNa+, is ca. 10−14 cm2 s−1 as calculated by the PITT and the discharge diffusion coefficient is a little larger than the charge one. The designed Na0.67Mn0.65Ni0.2Co0.15O2 shows great potential as a cathode material for sodium ion batteries.

Graphical abstract: Designing an advanced P2-Na0.67Mn0.65Ni0.2Co0.15O2 layered cathode material for Na-ion batteries

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Publication details

The article was received on 04 Apr 2015, accepted on 02 Jul 2015 and first published on 03 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA02450A
Citation: J. Mater. Chem. A, 2015,3, 16272-16278

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    Designing an advanced P2-Na0.67Mn0.65Ni0.2Co0.15O2 layered cathode material for Na-ion batteries

    Z. Li, R. Gao, L. Sun, Z. Hu and X. Liu, J. Mater. Chem. A, 2015, 3, 16272
    DOI: 10.1039/C5TA02450A

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