Polyimide gel polymer electrolyte-nanoencapsulated LiCoO2 cathode materials for high-voltage Li-ion batteries

Jang Hoon Park, Jong Su Kim, Eun Gi Shim, Kyung Won Park, Young Taik Hong, Yun Sung Lee, Sang Young Lee

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75 Citations (Scopus)


We demonstrate a novel and facile approach to surface modification of high-voltage charged LiCoO2, which is based on encapsulating LiCoO2 by a polyimide (PI) gel polymer electrolyte layer. The PI is introduced onto the LiCoO2 by thermally curing 4-component (pyromellitic dianhydride/biphenyl dianhydride/phenylenediamine/oxydianiline) polyamic acid. The PI nanoencapsulating layer features the high surface coverage, nanometer thickness, and facile ion transport. These unique characteristics are expected to enable the PI coating layer to effectively suppress the undesirable interfacial reaction of the LiCoO2 with liquid electrolyte, which plays a key role in noticeably improving the 4.4 V cycle performance and mitigating the vigorous exothermic reaction between the charged LiCoO2 and liquid electrolyte.

Original languageEnglish
Pages (from-to)1099-1102
Number of pages4
JournalElectrochemistry Communications
Issue number8
Publication statusPublished - 2010 Aug

Bibliographical note

Funding Information:
This work was supported by the IT R&D program of MKE/KEIT [ KI002176-2010-02 , Development of 3.6Ah Class Cylindrical Type Lithium Secondary Battery].

All Science Journal Classification (ASJC) codes

  • Electrochemistry


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