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 language | English |
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Pages (from-to) | 86-92 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 225 |
DOIs | |
Publication status | Published - 2017 Jan 20 |
Keywords
- Cathode material
- Energy storage materials
- Sodium-ion batteries
- Spray pyrolysis
ASJC Scopus subject areas
- Chemical Engineering(all)
- Electrochemistry