High Performance of Na_2/3Ni_1/4Mn_3/4O₂ Thin-Film Cathode for Sodium-Ion Micro-Batteries

Abstract:

Thin films of Na_2/3Ni_1/4Mn_3/4O₂ were prepared on stainless steel substrates by pulsed laser deposition technique. X-ray diffraction and Field-emission Scanning Electron Microscope results show that the thin film deposited at 750°C is highly preferred orientation with homogeneous nanoscale particles. Galvanostatic charge/discharge measurement results reveal that the reversible capacity retention is 91% after 30 cycles with a high initial discharge capacity of 175.3 mAhg^-1 at a current density of 13 mAg^-1. It also exhibits excellent rate capability, as the current density increases to 260 mAg^-1, about 80% of its initial capacity can be retained. After the high rate measurement, the NNMO electrode can deliver a discharge capacity of 110.4 mAhg^-1 when the current density was reduced back to 13 mAg^-1.

• Periodical: Applied Mechanics and Materials (Volume 864)
• Pages: 84-88
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.864.84
• Online since: April 2017
• Authors: Qian Peng, Guang Yang*
• Keywords: Cycling Performance, Na_2/3Ni_1/4Mn_3/4O₂, Rate Capability, Sodium-Ion Micro-Batteries

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