Synthesis and Electrochemical Study of New P3 Type Layered Na0.6Ni0.25Mn0.5Co0.25O2 for Sodium-Ion Batteries

Abstract : The room temperature stable P3 type Na0.6Ni0.25Mn0.5Co0.25O2 phase was studied as an interaction material for Na ion batteries. The phase was synthesized by mixed hydroxide co-precipitation method followed by heating at 750 degrees C in air. The phase purity was analyzed by means of Rietveld refinement using GSAS software. X-ray photoelectron spectroscopy (XPS) analysis showed that Co, and Mn are in oxidation states of 3+ and 4+, respectively, and Ni is in 2+ and 3+ oxidation states. The electrochemical properties of this layered material as a cathode delivered the reversible discharge capacity of 105 and 130 mAh/g at C/10 rate in the voltage window of 1.5-3.6 and 1.5-4.0 V vs. Na+/Na, respectively. The good capacity retention and nearly 99% of coloumbic efficiency was observed. The Na insertion and de-insertion was occurred by reversible phase transitions as evidenced by ex-situ powder X-ray diffration. With increasing cutoff voltage to 4.4 V, the ex-situ powder X-ray diffration pattern indicated that the existence of P3 phase at high Na de-insertion.
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Soumis le : vendredi 5 juillet 2019 - 17:01:43
Dernière modification le : vendredi 30 août 2019 - 17:19:24

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Satyanarayana Maddukuri, Pralong Valerie, Varadaraju V. Upadhyayula. Synthesis and Electrochemical Study of New P3 Type Layered Na0.6Ni0.25Mn0.5Co0.25O2 for Sodium-Ion Batteries. ChemistrySelect, Wiley, 2017, 2 (20), pp.5660-5666. ⟨10.1002/slct.201700376⟩. ⟨hal-02175431⟩

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