Poly(ionic liquid)s/Electrospun Nanofiber Composite Polymer Electrolytes for High Energy Density and Safe Li Metal Batteries

Xiaoen Wang, Gaetan M.A. Girard, Haijin Zhu, Ruhamah Yunis, Douglas R. Macfarlane, David Mecerreyes, Aninda J. Bhattacharyya, Patrick C. Howlett, Maria Forsyth

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

Solid-state electrolytes with mechanical integrity and high ionic conductivity are important components in high performance all-solid-state lithium (Li) batteries. Relative to these electrolytes, ionic liquid-based composite polymer electrolytes exhibit high ionic conductivity and improved safety. However, the incorporation of large concentration of nonactive ions and the presence of a liquid phase lead to relatively low Li+ transference number and poor mechanical properties. In this study, poly(ionic liquid)s or polymerized ionic liquids (polyILs) are combined with an electrospun fibrous support to afford electrolytes with high ionic liquid content and greatly increased Li+ transference number. The incorporation of electrospun PVDF nanofibers effectively improves the mechanical strength of the composite polymer electrolytes, and consequently, flexible electrolytes with superior mechanical properties are described. Finally, we demonstrate the performance of high energy density Li metal batteries under high-voltage operation (up to 4.5 V) using LiNiMnCoO2 (NMC) and LiNi0.8Co0.15Al0.05O2 (NCA) cathodes with an areal capacity up to 1.1 mAh cm-2

Original languageEnglish
Pages (from-to)6237-6245
Number of pages9
JournalACS Applied Energy Materials
Volume2
Issue number9
DOIs
Publication statusPublished - 23 Sep 2019

Keywords

  • composite polymer electrolytes (CPEs)
  • energy density
  • high-voltage
  • Li metal batteries
  • poly(ionic liquid)s

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