Layered Na2Mn3O7 as a 3.1 v Insertion Material for Li-Ion Batteries

Sada, K and Senthilkumar, B and Barpanda, P (2018) Layered Na2Mn3O7 as a 3.1 v Insertion Material for Li-Ion Batteries. In: ACS Applied Energy Materials, 1 (12). pp. 6719-6724.

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Abstract

Exploring Mn-based battery insertion materials, layered Na2Mn3O7 was synthesized via single pot solid-state method. Rietveld analysis confirmed the formation of triclinic structured Na2Mn3O7 with P-1 symmetry. With no further optimization, the as-synthesized Na2Mn3O7 was found to be an efficient host for Li+ (de)intercalation. Na2Mn3O7 delivered a discharge capacity of ∼160 mA h g-1 by altering the redox couple Mn(IV)/Mn(III) with a nominal voltage of 3.12 V (vs Li/Li+). Interestingly, the first discharge of pristine Na2Mn3O7 led to the formation of LixNa2Mn3O7 (2 < x < 3) having completely different phase similar to the LiCoO2 structure. Lithiation triggered phase transformation from triclinic (P-1) to trigonal (R-3m) structure. This electrochemically reformed structure imparts stability to [Mn3O7]-2∞ building layers, preventing irreversible capacity loss. Underlying a single-phase (solid-solution) redox mechanism, Na2Mn3O7 acts as a robust cathode material for Li-ion batteries.

Item Type:	Journal Article
Publication:	ACS Applied Energy Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Cathodes; Cobalt compounds; Ions; Lithium compounds; Lithium-ion batteries; Manganese compounds; Rietveld analysis; Sodium compounds; Solid-State Batteries, capacity; Discharge capacities; Insertion materials; Insertion mechanism; Irreversible capacity loss; Layered cathode; Na2Mn3O7; Solid state method, Phosphorus compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	29 Jul 2022 11:22
Last Modified:	29 Jul 2022 11:22
URI:	https://eprints.iisc.ac.in/id/eprint/75050

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