Clay nanosheets in skeletons of controlled phase inversion separators for thermally stable li-ion batteries

Min Kim, Jung Kyu Kim, Jong Hyeok Park

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Phase inversion is a powerful alternative process for preparing ultra-thin separators for various secondary batteries. Unfortunately, separators prepared from phase inversion generally suffer from uneven pore size and pore size distribution, which frequently results in poor battery performance. Here, a straightforward route is demonstrated to solve the drawbacks of phase-inversion-based separators for Li-ion batteries by means of directly incorporating 2D clay sheets in the skeleton of poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) with multiscale pore generation from a simple one-step solution coating method. Additionally generated pores by the inclusion of 2D nanosheets in PVdF-HFP skeletons, combined with the multiscale pores (several micrometers + sub-micrometers) originally generated by means of the controlled phase inversion, can generate additional ionic transport pathways, leading to Li-ion battery performances better than those of commercialized polyethylene separators. Moreover, the addition of extremely low contents of 2D clay sheets in PVdF-HFP separators allows thermally stable polymer separators to be realized. A straightforward route to solve the drawbacks of phase-inversion-based separators for Li-ion batteries is demonstrated by means of directly incorporating 2D clay sheets in the skeleton of poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) with multiscale pore generation from a simple one-step solution coating method.

Original languageEnglish
Pages (from-to)3399-3404
Number of pages6
JournalAdvanced Functional Materials
Volume25
Issue number22
DOIs
Publication statusPublished - 2015 Jun 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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