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Surface transformation by a “cocktail” solvent enables stable cathode materials for sodium ion batteries

Abstract

Coating the surfaces of active materials has become an effective and indispensable path towards the stable operation of practical rechargeable batteries. Improving the affordability of coating processes can bring enormous manufacturing advantages to battery applications. Herein, we report a cheap, simple and efficient method to create conformal coating layers on the primary particles of sodium layered oxide materials for improving battery performance. Mimicking the cathode–electrolyte interfacial reaction in practical cells, we create conformal coating layers via the spontaneous reaction between the oxidative cathode surfaces and a cocktail of reductive organic solvents. The conformal coating layers consist of metal–organic compounds with reduced transition metal cations, i.e., artificial cathode–electrolyte interphases (CEIs). The cells containing these coated cathode materials deliver much improved cycle life while maintaining reasonably high reversible capacity and rate capability. Furthermore, the structural stability and water resistance are enhanced, which can practically help simplify the storage protocol of cathode powders prior to battery manufacturing. The surfaces of most oxide cathode materials (e.g., lithium cathodes, sodium cathodes) are highly oxidative, thus we expect that the present method, with tailored experimental parameters, can be readily applied to most battery systems.

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Publication details

The article was received on 23 Sep 2017, accepted on 09 Jan 2018 and first published on 09 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA08410B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Surface transformation by a “cocktail” solvent enables stable cathode materials for sodium ion batteries

    L. Mu, M. M. Rahman, Y. Zhang, X. Feng, X. Du, D. Nordlund and F. Lin, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA08410B

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