A novel ion-conductive protection skin based on polyimide gel polymer electrolyte: Application to nanoscale coating layer of high voltage LiNi 1/3Co 1/3Mn 1/3O 2 cathode materials for lithium-ion batteries

Sang Young Lee, Jang Hoon Park, Ju Hyun Cho, Sung Bae Kim, Woo Sung Kim, Sun Young Lee

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61 Citations (Scopus)

Abstract

A new and facile approach for the surface modification of high-voltage LiNi 1/3Co 1/3Mn 1/3O 2 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 LiNi 1/3Co 1/3Mn 1/3O 2 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 LiNi 1/3Co 1/3Mn 1/3O 2 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 LiNi 1/3Co 1/3Mn 1/3O 2 and liquid electrolyte. These results demonstrate that the PI wrapping layer effectively prevents the direct exposure of the LiNi 1/3Co 1/3Mn 1/3O 2 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.

Original languageEnglish
Pages (from-to)12574-12581
Number of pages8
JournalJournal of Materials Chemistry
Volume22
Issue number25
DOIs
Publication statusPublished - 2012 Jul 7

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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