Effect of zwitterionic salt on the electrochemical properties of a solid polymer electrolyte with high temperature stability for lithium ion batteries
✍ Scribed by Z.H. Li; Q.L. Xia; L.L. Liu; G.T. Lei; Q.Z. Xiao; D.S. Gao; X.D. Zhou
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 441 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
In this study, we prepare a kind of solid polymer electrolyte (SPE) based on N-ethyl-N -methyl imidazolium tetrafluoroborate (EMIBF 4 ), LiBF 4 and poly(vinylidene difluoride-co-hexafluoropropylene) [P(VdF-HFP)] copolymer. The resultant SPE displays high thermal stability above 300 • C and high room temperature ionic conductivity near to 10 -3 S cm -1 . Its electrochemical properties are improved with incorporation of a zwitterionic salt 1-(1-methyl-3-imidazolium)propane-3-sulfonate (MIm3S). When the SPE contains 1.0 wt% of the MIm3S, it has a high ionic conductivity of 1.57 × 10 -3 S cm -1 at room temperature, the maximum lithium ions transference number of 0.36 and the minimum apparent activation energy for ions transportation of 30.9 kJ mol -1 . The charge-discharge performance of a Li 4 Ti 5 O 12 /SPE/LiCoO 2 cell indicates the potential application of the as-prepared SPE in lithium ion batteries.