Sathiya, M. and Hemalatha, K. and Ramesha, K. and Tarascon, J.M. and Prakash, A.S. (2012) Synthesis, Structure, and Electrochemical Properties of the Layered Sodium Insertion Cathode Material: NaNi1/3Mn1/3Co1/3O2. Chemistry of Materials, 24. pp. 1846-1853. ISSN 0897-4756

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A layered phase, NaNi1/3Mn1/3Co1/3O2 (NaNMC), isostructural to NaCoO2 has been synthesized. Stoichiometric NaNMC crystallizes in a rhombohedral R3̅m space group where Na is in an octahedral environment (O3-Type). Galvanostatic cycling on NaNMC vs Na cell indicated a reversible intercalation of 0.5 Na, leading to a capacity of 120 mAh·g−1 in the voltage range of 2−3.75 V and indicating its possible application in Naion batteries. The electrochemically driven Na insertion/deinsertion in NaNMC is associated with several phase transitions and solid solution regimes which are studied by in situ X-ray diffraction. Sodium deinsertion in NaxNMC resulted in sequential phase transitions composed of biphasic and monophasic domains. The composition driven structural evolution in NaxNMC follows the sequence O3 ⇒ O1 ⇒ P3 ⇒ P1 phases with an increased ‘c’ parameter, while the ‘a’ parameter remains almost unchanged.

Item Type: Article
Uncontrolled Keywords: sodium-ion batteries, layered compounds, NaNMC, in situ XRD
Subjects: Electrochemical Power Sources
Depositing User: Dr. N Meyyappan
Date Deposited: 31 Dec 2014 08:42
Last Modified: 31 Dec 2014 08:42

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