Electrochemical properties of P2-type Na2/3Ni1/3Mn2/3O2 plates synthesized by spray pyrolysis process for sodium-ion batteries

Seung Yeon Lee, Jong Hwa Kim, Yun Chan Kang

Research output: Contribution to journalArticle

24 Citations (Scopus)

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 P2-Na2/3Ni1/3Mn2/3O2 plates after post-treatment at temperatures between 800 and 1000 °C. The mean size and thickness of P2-Na2/3Ni1/3Mn2/3O2 plates obtained after post-treatment at 900 °C are 2.2 μm and 550 nm, respectively. The initial discharge capacities of P2-Na2/3Ni1/3Mn2/3O2 plates formed at 800, 900, and 1000 °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. P2-Na2/3Ni1/3Mn2/3O2 plates show low charge-transfer resistance and also exhibit better rate performance than P3-Na2/3Ni1/3Mn2/3O2 powders.

Original languageEnglish
Pages (from-to)86-92
Number of pages7
JournalElectrochimica Acta
Volume225
DOIs
Publication statusPublished - 2017 Jan 20

Keywords

  • Cathode material
  • Energy storage materials
  • Sodium-ion batteries
  • Spray pyrolysis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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