Weakly Coordinating Fluorine-Free Polysalt for Single Lithium-Ion Conductive Solid Polymer Electrolytes

Maria Martinez-Ibañez, Eduardo Sanchez-Diez, Lixin Qiao, Leire Meabe, Alexander Santiago, Haijin Zhu, Luke A. O'Dell, Javier Carrasco, Maria Forsyth, Michel Armand, Heng Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


A novel single lithium-ion conducting (SLIC) polymer electrolyte containing a weakly coordinating fluorine-free polysalt is presented. The polysalt, lithium poly(4-styrenesulfonyl)(dicyano)methide (LiPSDM), is conceived on the basis of a fluorine-free green chemistry, and motivated by the highly performing non-fluorinated lithium tricyanomethanide (LiTCM) salt. The electrolyte comprising LiPSDM and poly(ethylene oxide) (PEO) shows good thermal stability, decent ionic conductivity, and high lithium transference number. In stark contrast to other fluorine-free polysalts, such as, poly(4-styrenesulfonate) (LiPSS), the replacement of −SO3 moiety by −SO2C(−)(CN)2 improves the flexibility of the anion and the charge delocalization, leading to an improved amorphization of PEO and an overall better performance. Moreover, solid-state nuclear magnetic resonance (NMR) measurements are performed to unravel the role of anion chemistry on the fundamental transport properties of SLICs. The present work is believed to facilitate the design of high-performance fluorine-free polymer electrolytes which are important building blocks for safe, green, and sustainable battery technologies.

Original languageEnglish
Pages (from-to)738-746
Number of pages9
JournalBatteries and Supercaps
Issue number8
StatePublished - 1 Aug 2020
Externally publishedYes


  • lithium batteries
  • lithium poly(4-styrenesulfonyl)(dicyano)methide
  • single lithium-ion conductor
  • solid polymer electrolytes


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