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P2-Type Transition Metal Oxides for High Performance Na-Ion Battery Cathodes

Abstract

The particle pulverization induced by volume change and disproportional reaction of Mn3+ to Mn4+ and electrolyte-soluble Mn2+ are two major challenges for Na0.67MnO2 cathodes for Na-ion batteries. Herein, Ni and/or Fe doped Na0.67MnO2 was synthesized to suppress the particle pulverization and disproportional reaction. Replacement of 33% Mn ions by Ni in Na0.67MnO2 can effectively reduce the particle pulverization and disproportionation of Mn3+, resulting in improved cycling stability at a price of reduced capacity. To maintain both a high capacity and a long cycle life cathode material, Ni in Na0.67Ni0.33Mn0.67O2 is further partially substituted by Fe to generate Na0.67Fe0.20Ni0.15Mn0.65O2, which retains ~70% of its initial capacity after 900 cycles, corresponding to a very low capacity decay rate of 0.033% per cycle. To the best of our knowledge, the Na0.67Fe0.20Ni0.15Mn0.65O2 synthesized by ultrasonic spray pyrolysis (USP) represents one of the best cathode materials for Na-ion batteries to date. In addition, a thin layer (5 nm) of Al2O3 is deposited on Na0.67MnO2 electrode by atomic layer deposition (ALD) to further reduce the dissolution of Mn-ion and accommodate the volume change, which further extend cycling stability of Na0.67MnO2 electrodes.

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Publication details

The article was received on 24 May 2017, accepted on 31 Jul 2017 and first published on 01 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04515H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    P2-Type Transition Metal Oxides for High Performance Na-Ion Battery Cathodes

    C. Luo, A. Langrock, X. Fan, Y. Liang and C. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04515H

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