Activation of Passive Nanofillers in Composite Polymer Electrolyte for Higher Performance Lithium-Ion Batteries

Roya Naderi, Ashim Gurung, Zhengping Zhou, Geetha Varnekar, Ke Chen, Jiantao Zai, Xuefeng Qian, Qiquan Qiao

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Poor ionic conductivity in gel or solid electrolytes hinders the electrochemical performance and hence applications of solid-state lithium-ion batteries. In this work, a simple and efficient approach to increase the ionic conductivity of gel electrolytes is reported. Composite gel polymer electrolyte (CGPE) films, consisting of poly(vinylidene fluoride-hexafluoropropylene) as the host polymer and the trilayer polypropylene membrane as the mechanical support, are prepared using charge-modified acidic TiO2 and basic SiO2 nanoparticles as ionic conductors. Ionic conductivities of 1.56, 1, and 1 × 10−2 mS cm−1 for acidic CGPE, basic CGPE, and CGPE without nanofillers are achieved, respectively. The Li-graphite cells employing the modified nanofillers incorporated CGPE show an enhanced electrochemical performance with the first cycle specific capacity of 412/408.5 mAh g−1 for the cell with acidic CGPE and 349/347.18 mAh g−1 with basic CGPE at the C/20 rate. After five cycles, each of C/8, C/4, C/2, and 1C, the acidic CGPE demonstrates a capacity retention of 78% compared to that of the basic one with 70%. This modification method has been demonstrated as a simple, facile, and scalable technique to improve electrolyte performance for solid-state lithium-ion batteries.

Original languageEnglish (US)
Article number1700043
JournalAdvanced Sustainable Systems
Volume1
Issue number8
DOIs
StatePublished - Aug 1 2017
Externally publishedYes

Keywords

  • gel polymers
  • ionic conductivity
  • lithium-ion batteries
  • nanofillers
  • PVDF-HFP
  • solid-state electrolytes

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)

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