Polymer composite electrolytes having core-shell silica fillers with anion-trapping boron moiety in the shell layer for all-solid-state lithium-ion batteries

Jimin Shim, Dong Gyun Kim, Hee Joong Kim, Jin Hong Lee, Jong Chan Lee

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Core-shell silica particles with ion-conducting poly(ethylene glycol) and anion-trapping boron moiety in the shell layer were prepared to be used as fillers for polymer composite electrolytes based on organic/inorganic hybrid branched copolymer as polymer matrix for all-solid-state lithium-ion battery applications. The core-shell silica particles were found to improve mechanical strength and thermal stability of the polymer matrix and poly(ethylene glycol) and boron moiety in the shell layer increase compatibility between filler and polymer matrix. Furthermore, boron moiety in the shell layer increases both ionic conductivity and lithium transference number of the polymer matrix because lithium salt can be more easily dissociated by the anion-trapping boron. Interfacial compatibility with lithium metal anode is also improved because well-dispersed silica particles serve as protective layer against interfacial side reactions. As a result, all-solid-state battery performance was found to be enhanced when the copolymer having core-shell silica particles with the boron moiety was used as solid polymer electrolyte.

Original languageEnglish (US)
Pages (from-to)7690-7701
Number of pages12
JournalACS Applied Materials and Interfaces
Volume7
Issue number14
DOIs
StatePublished - Apr 15 2015

Keywords

  • boron
  • core-shell silica
  • lithium transference number
  • lithium-ion battery
  • solid polymer electrolyte

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