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Electrochemical properties of P2-type Na2/3Ni1/3Mn2/3O2 plates synthesized by spray pyrolysis process for sodium-ion batteries
- Authors
- Lee, Seung Yeon; Kim, Jong Hwa; Kang, Yun Chan
- Issue Date
- 20-Jan-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Energy storage materials; Sodium-ion batteries; Cathode material; Spray pyrolysis
- Citation
- ELECTROCHIMICA ACTA, v.225, pp.86 - 92
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 225
- Start Page
- 86
- End Page
- 92
- ISSN
- 0013-4686
- Abstract
- P2-type Na2/3Ni1/3Mn2/3O2 plates with homogeneous composition and regular morphology are prepared by spray pyrolysis. The rhombohedral P3-Na2/3Ni1/3Mn2/3O2 microspheres formed by one-pot spray pyrolysis transform into hexagonal P-2-Na2/3Ni1/3Mn2/3O2 plates after post-treatment at temperatures between 800 and 1000 degrees C. The mean size and thickness of P-2-Na2/3Ni1/3Mn2/3O2 plates obtained after post-treatment at 900 degrees C are 2.2 mm and 550 nm, respectively. The initial discharge capacities of 'P-2-Na(2/3)Ni(1/3)Mn(2/3)O(2)plates formed at 800, 900, and 1000 degrees C at a current rate of 0.1C are 69, 86, and 80 mA h g(1), respectively, while the discharge capacities after 200 cycles are 68, 80, and 76 mA h g(1), respectively. However, the discharge capacities of P3-Na2/3Ni1/3Mn2/3O2 powders decrease from 62 to 50 mA h g(1) after 200 cycles. P-2-Na2/3Ni1/3Mn2/3O2 plates show low charge-transfer resistance and also exhibit better rate performance than P3-Na2/3Ni1/3Mn2/3O2 powders. (C) 2016 Elsevier Ltd. All rights reserved.
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