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Issue 25, 2012
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A novel ion-conductive protection skin based on polyimide gel polymer electrolyte: application to nanoscale coating layer of high voltage LiNi1/3Co1/3Mn1/3O2 cathode materials for lithium-ion batteries

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Abstract

A new and facile approach for the surface modification of high-voltage LiNi1/3Co1/3Mn1/3O2 cathode active materials is demonstrated. This strategy is based on polyimide (PI) gel polymer electrolyte (GPE)-directed nanoscale wrapping. The PI coating layer successfully wraps a large area of the LiNi1/3Co1/3Mn1/3O2 surface via thermal imidization of (pyromellitic dianhydride/oxydianiline) polyamic acid. Salient features of the PI wrapping layer are the highly continuous surface coverage with nanometre thickness (∼10 nm) and the facile ion transport through the nanoscale layer. Based on a sound understanding of the nanoarchitectured PI wrapping layer, its influence on the cell performance and thermal stability of high-voltage LiNi1/3Co1/3Mn1/3O2 is investigated as a function of charge cut-off voltage (herein, 4.6 and 4.8 V). The anomalous PI wrapping layer substantially improves the high-voltage cycling performance and alleviates the interfacial exothermic reaction between delithiated LiNi1/3Co1/3Mn1/3O2 and liquid electrolyte. These results demonstrate that the PI wrapping layer effectively prevents the direct exposure of the LiNi1/3Co1/3Mn1/3O2 surface to liquid electrolytes that are highly vulnerable to electrochemical decomposition at high charge voltage conditions, thus behaving as a novel ion-conductive protection skin that mitigates the unwanted interfacial side reactions.

Graphical abstract: A novel ion-conductive protection skin based on polyimide gel polymer electrolyte: application to nanoscale coating layer of high voltage LiNi1/3Co1/3Mn1/3O2 cathode materials for lithium-ion batteries

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Publication details

The article was received on 23 Dec 2011, accepted on 18 Apr 2012 and first published on 22 May 2012


Article type: Paper
DOI: 10.1039/C2JM16799A
Citation: J. Mater. Chem., 2012,22, 12574-12581
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    A novel ion-conductive protection skin based on polyimide gel polymer electrolyte: application to nanoscale coating layer of high voltage LiNi1/3Co1/3Mn1/3O2 cathode materials for lithium-ion batteries

    J. Park, J. Cho, S. Kim, W. Kim, S. Lee and S. Lee, J. Mater. Chem., 2012, 22, 12574
    DOI: 10.1039/C2JM16799A

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