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Journal of Shanghai University >

2019 , Vol. 25 >Issue 5: 776 - 785

DOI: https://doi.org/10.12066/j.issn.1007-2861.1959

Research Paper

Mechanism of capacity degradation of β-NaMnO2 as cathode material for sodium ion battery

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  • School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

Received date: 2017-04-27

  Online published: 2019-10-31

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Abstract

Due to its easy synthesis process and high theoretical capacity, layered $\beta $-NaMnO$_{2}$ is considered as a potential cathode material in sodium ion battery. However, studies on its capacity degradation in the first several cycles are rare. In this article, $\beta $-NaMnO$_{2}$ was prepared by a solid state method, which had a high initial discharge capacity of 184 mA$\cdot$h/g at 10 mA/g with a capacity retention of 73% after 10 cycles. The mechanism of capacity degradation was investigated based on X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscope (XPS). Phase transformation was recorded by XRD in the first three cycles, showing appearance of Na$_{0.91}$MnO$_{2}$ and Na$_{0.7}$MnO$_{2}$ in the discharge process with low crystallinity instead recrystallization of NaMnO$_{2}$. The proportion of disorder structure increased upon Na$^+$-ion extraction, associated with a loss of crystallinity as evidenced by HRTEM observation. XPS further explained the valence variation of Mn in different phases in the cycling.

Key words： sodium ion battery; cathode material; $\beta$-NaMnO$_{2}$; degradation mechanism

Cite this article

Chenzi LIU, Yemin HU, Wenxian LI, Yang LIU, Pengfei HU, Hongming JIN, Mingyuan ZHU, Ying LI . Mechanism of capacity degradation of β-NaMnO2 as cathode material for sodium ion battery[J]. Journal of Shanghai University, 2019 , 25(5) : 776 -785 . DOI: 10.12066/j.issn.1007-2861.1959

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