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A high energy-density P2-Na2/3[Ni0.3Co0.1Mn0.6]O2 cathode with mitigated P2−O2 transition for sodium-ion batteries

Abstract

High voltage P2-Na2/3[Ni1/3Mn2/3]O2 is regarded as a promising cathode for high-energy sodium-ion batteries (SIBs). However, the undesired P2−O2 phase transition at high voltages above 4.0 V leads to the large volume change and further causes the rapid decay of capacity. Herein, an electrochemical-active Co3+ substitution is introduced to suppress the P2−O2 phase transformation but not at a cost of capacity. The spherical, Co3+ substituted P2-Na2/3[Ni0.3Co0.1Mn0.6]O2 with a high tap-density of 1.86 g cm−3 are successfully synthesized by co-precipitation and solid-state reactions. As anticipated, it delivers a large specific capacity of 161.6 mA h g−1 with a high median-voltage of 3.64 V (vs Na/Na+), translated into a high energy-density of ~590 Wh kg−1, which is comparable to that of the commercialized LiCoO2 cathode in lithium-ion batteries. Apart from improved cycling stability ascribed to the mitigated P2−O2 transition, this cathode also shows a better rate property compared with these modified by Li+, Mg2+, Zn2+, Cu2+, Ti4+ doping and Al2O3 coating. Besides, the P2-Na2/3[Ni0.3Co0.1Mn0.6]O2│hard carbon full-cells deliver a reversible capacity of 150.6 mAh g−1, enhanced cycle-life and high-rate capability. These gratifying achievements indicate that this P2-Na2/3[Ni0.3Co0.1Mn0.6]O2 is a very promising candidate as high energy-density cathodes for SIBs.

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Publication details

The article was received on 28 Nov 2018, accepted on 07 Jan 2019 and first published on 08 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR09601E
Citation: Nanoscale, 2019, Accepted Manuscript
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    A high energy-density P2-Na2/3[Ni0.3Co0.1Mn0.6]O2 cathode with mitigated P2−O2 transition for sodium-ion batteries

    P. Hou, Y. Sun, F. Li, Y. Sun, X. Deng, H. Zhang, X. Xu and L. Zhang, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR09601E

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