Blending of hard and soft organic-inorganic hybrids for use as an effective electrolyte membrane in lithium-ion batteries

Diganta Saikia, Sze Yuan Ho, Yu Ju Chang, Jason Fang, Li Duan Tsai, Hsien Ming Kao

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this study, two unique organic-inorganic hybrids are synthesized and optimized to obtain a new type of hybrid blend membrane. A soft hybrid is obtained from reaction of polyetheramine (M-2070) and (3-glycidyloxypropyl)trimethoxysilane (GLYMO), whereas a hard hybrid is prepared from reactions of polyetherdiamine (ED2003), poly(ethylene glycol) diglycidyl ether (PEGDGE) and GLYMO. Both hybrids are finally blended with poly(vinylidene fluoride-co-hexafluoropropylene) (P(VdF-HFP)) to get the hybrid blend membrane and plasticized with 1M LiPF6 in EC/DEC. The successful synthesis of the hybrid blend membrane structure is established from 13C and 29Si solid-state NMR spectroscopy. FTIR results reveal the interactions of different groups of the hybrid blend membrane. The hybrid blend electrolyte possesses maximum ionic conductivity value of 6.9mScm-1 at 30°C and is electrochemically stable up to 5V. The electrochemical performance of the hybrid blend electrolyte assemble in a battery cell with the LiFePO4 cathode exhibits a good cycle life of over 200 cycles with an initial discharge capacity of 150mAhg-1. In addition, coulombic efficiency of 97-99% is maintained for the whole cycles. Our results demonstrate that the present hybrid blend electrolyte can be a potential candidate serving as an effective electrolyte in lithium-ion batteries.

Original languageEnglish
Pages (from-to)59-68
Number of pages10
JournalJournal of Membrane Science
Volume503
DOIs
StatePublished - 1 Apr 2016

Keywords

  • Blending
  • Ionic conductivity
  • Linear sweep voltammetry
  • Lithium-ion batteries
  • Organic-inorganic hybrid electrolyte

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