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Ionics

, Volume 24, Issue 8, pp 2287–2294 | Cite as

Thermal and electrochemical properties of poly(butylene sulfite)-based polymer electrolyte

  • Takahito Itoh
  • Satoshi Niihara
  • Takahiro Uno
  • Masataka Kubo
Original Paper

Abstract

Poly(butylene sulfite) (poly-1) was synthesized by cationic ring-opening polymerization of butylene sulfite (1), which was prepared by the reaction of 1,4-butanediol and thionyl chloride, with trifluoromethanesulfonic acid (TfOH) in bulk. The polymer electrolytes composed of poly-1 with lithium salts such as bis(trifluoromethanesulfonyl)imide (LiN(SO2CF3)2, LiTFSI) and bis(fluorosulfonyl)imide (LiN(SO2F)2, LiFSI) were prepared, and their ionic conductivities, thermal, and electrochemical properties were investigated. Ionic conductivities of the polymer electrolytes for the poly-1/LiTFSI system increased with lithium salt concentrations, reached maximum values at the [LiTFSI]/[repeating unit] ratio of 1/10, and then decreased in further more salt concentrations. The highest ionic conductivity values at the [LiTFSI]/[repeating unit] ratio of 1/10 were 2.36 × 10−4 S/cm at 80 °C and 1.01 × 10−5 S/cm at 20 °C. On the other hand, ionic conductivities of the polymer electrolytes for the poly-1/LiFSI system increased with an increase in lithium salt concentrations, and ionic conductivity values at the [LiFSI]/[repeating unit] ratio of 1/1 were 1.25 × 10−3 S/cm at 80 °C and 5.93 × 10−5 S/cm at 20 °C. Glass transition temperature (T g) increased with lithium salt concentrations for the poly-1/LiTFSI system, but T g for the poly-1/LiFSI system was almost constant regardless of lithium salt concentrations. Both polymer electrolytes showed high transference number of lithium ion: 0.57 for the poly-1/LiTFSI system and 0.56 for the poly-1/LiFSI system, respectively. The polymer electrolytes for the poly-1/LiTFSI system were thermally more stable than those for the poly-1/LiFSI system.

Keywords

Polysulfite Polymer electrolyte Ionic conductivity Transference number Thermal property 

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Takahito Itoh
    • 1
  • Satoshi Niihara
    • 1
  • Takahiro Uno
    • 1
  • Masataka Kubo
    • 1
  1. 1.Division of Chemistry for Materials, Graduate School of EngineeringMie UniversityTsuJapan

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