Effect of downsizing the maricite α-phase sodium cobalt phosphate (α-NaCoPO4) in sodium-ion battery
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Maricite α-phase sodium cobalt phosphate (α-NaCoPO4) (so called NCP) was fabricated by easily scalable and energy efficient method such as solution combustion synthesis. The obtained material was further ball-milled with carbon (NCP/C) to get nano-sized resultant particles. The orthorhombic crystal structure was confirmed by powder X-ray diffraction and purity of the material evidenced by X-ray photoelectron spectroscopy (XPS). The surface morphology and particle size of the materials were studied by scanning electron and transmission electron microscopic analyses. In cyclic voltammetric analysis, the cathode made up of NCP/C material showed a significant redox activity at 2.33 and 4.3 V. The NCP/C material exhibited a reversible intercalation with a discharge capacity of 36 mAh g−1 at 0.1 C and 50% capacity retention after 100 cycles in Na half-cell. To the best of our knowledge, the maricite α-NaCoPO4 cathode has been taken part in the charge/discharge process with the active sodium ions.
KeywordsCombustion Ball-milled α-NaCoPO4 Orthorhombic Discharge capacity Maricite Energy storage
All the authors from Alagappa University were financially supported by DST-SERB, New Delhi, under the Physical Sciences, grant sanctioned vide EMR/2016/006302. All the authors gratefully acknowledge for extending the analytical facilities in the Department of Physics, Alagappa University under the PURSE and FIST programmes, sponsored by Department of Science and Technology (DST) New Delhi, Govt. of India, Alagappa University Research Fund (AURF), Karaikudi, and Ministry of Human Resource Development RUSA- Phase 2.0 grant sanctioned vide Lt.No.F-24-51/2014 U Policy (TNMulti Gen), Dept. of Education, Govt. of India.
All the authors equally contributed in terms of framing, planning and executing this research work, including analytical and writing parts.
All the authors from Alagappa University were financially supported by DST-SERB, New Delhi, under the Physical Sciences, grant sanctioned vide EMR/2016/006302.
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Conflict of interest
The authors declare that they have no conflict of interest.