A molybdenum doped layer-spinel composite cathode material for sodium-ion battery

Vanam, SP and Barpanda, P (2022) A molybdenum doped layer-spinel composite cathode material for sodium-ion battery. In: Electrochimica Acta, 431 .

PDF Ele_Act_431.pdf - Published Version Restricted to Registered users only Download (5MB)

Abstract

Sodium-ion batteries are pursued as pragmatic alternative to the Li-ion battery technology having operational similarity along with natural resource abundance. P2-type manganese-rich layered oxides are widely explored exhibiting high capacity along with fast rate kinetics. To improve their electrochemical performance and reduce voltage decay upon cycling and to mitigate irreversible phase transitions, cation doping or hybrid composite integrations have been proposed. Here, we report a unique Mn-rich layer-spinel composite, Na0.7(Li1/18Mn11/18Ni3/18Fe2/18χ1/18)O2–xNa2MoO4, leading to a synergistic effect of layered P2 and spinel phases. This stable layer/spinel biphasic composite was stabilized through Mo doping and its electrochemical activity was studied at different voltage windows. When cycled between 1.5–4.5 V, this composite delivered a high specific capacity of 183 mAh.g–1 involving both cationic and anionic (O2–/O2n–) redox. The structural evolution during (dis)charge was studied by ex-situ X-ray diffraction and cyclic voltammetry. It is observed that mitigating P2-P2′′ phase transition at higher voltage is crucial to improve the electrochemical performance, cycling stability and reduce the voltage hysteresis.

Item Type:	Journal Article
Publication:	Electrochimica Acta
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Cathodes; Cyclic voltammetry; Lithium-ion batteries; Metal ions; Molybdenum, Battery technology; Composite cathode material; Doped layers; Electrochemical performance; High capacity; Layered oxides; P2-layer/spinel composite; P2-p2�� phase transition; Resource abundance; Sodium ion batteries, Sodium-ion batteries
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	06 Oct 2022 06:25
Last Modified:	06 Oct 2022 06:25
URI:	https://eprints.iisc.ac.in/id/eprint/77135

Actions (login required)

View Item