Title

Synthesis and electrochemical properties of a new compound, Na0.8Li0.1Ni0.31Mn0.62O2

RIS ID

134948

Publication Details

Liu, G., Yu, H., Liang, J., Zhang, J. & Wen, L. (2019). Synthesis and electrochemical properties of a new compound, Na0.8Li0.1Ni0.31Mn0.62O2. Journal of Alloys and Compounds, 792 308-313.

Abstract

Layered manganese-based oxide is an important cathode material for sodium ion batteries and its performance strongly depends on the composition of the material. Here we synthesize a new compound Na 0.8 Li 0.1 Ni 0.31 Mn 0.62 O 2 by a solid-state reaction method and investigate its electrochemical performance. The resultant material displays a high capacity of 138 mAh g −1 in the voltage range of 2.0-4.4 V, with good capacity retention. It also displays an excellent rate capability, by delivering a high capacity of 94 mAh g −1 at a high current density of 788.5 mA g −1 . The sodium ion diffusion coefficient of the Na 0.8 Li 0.1 Ni 0.31 Mn 0.62 O 2 is calculated to be 5.8 x 10 −12 cm 2 s −1 by AC impedance testing, which is superior to the previously reported Al-doped P2-Na 2/3 Ni 1/3 Mn 5/9 Al 1/9 O 2 compound.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jallcom.2019.04.020