Layered NaxMnO2+z in sodium ion batteries-influence of morphology on cycle performance

Bucher, Nicolas and Hartung, Steffen and Nagasubramanian, Arun and Cheah, Yan Ling and Hoster, Harry E. and Madhavi, Srinivasan (2014) Layered NaxMnO2+z in sodium ion batteries-influence of morphology on cycle performance. ACS Applied Materials and Interfaces, 6 (11). pp. 8059-8065. ISSN 1944-8244

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Abstract

Due to its potential cost advantage, sodium ion batteries could become a commercial alternative to lithium ion batteries. One promising cathode material for this type of battery is layered sodium manganese oxide. In this investigation we report on the influence of morphology on cycle performance for the layered NaxMnO2+z. Hollow spheres of NaxMnO2+z with a diameter of similar to 5 mu m were compared to flake-like NaxMnO2+z. It was found that the electrochemical behavior of both materials as measured by cyclic voltammetry is comparable. However, the cycle stability of the spheres is significantly higher, with 94 mA h g(-1) discharge capacity after 100 cycles, as opposed to 73 mA h g(-1) for the flakes (50 mA g(-1)). The better stability can potentially be attributed to better accommodation of volume changes of the material due to its spherical morphology, better contact with the added conductive carbon, and higher electrode/electrolyte interface owing to better wetting of the active material with the electrolyte.

Item Type:
Journal Article
Journal or Publication Title:
ACS Applied Materials and Interfaces
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500
Subjects:
ID Code:
72629
Deposited By:
Deposited On:
27 Jan 2015 09:59
Refereed?:
Yes
Published?:
Published
Last Modified:
04 Apr 2020 03:03