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Improved ion dissociation and amorphous region of PEO based solid polymer electrolyte by incorporating tetracyanoethylene
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DOI：10.1016/j.matpr.2020.10.950.png)
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Abstract
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Solid polymer electrolytes (SPEs) are key materials in safety and flexibility of rechargeable lithium-ion batteries but their ionic conductivities are very low compared with that of liquid electrolytes. One of the reasons for the low ionic conductivity was the low ion dissociation due to low dielectric constant of polymer. So, it should be required to increase the dielectric constant of polymer matrix. We prepared poly (ethylene oxide) (PEO)-based composite polymer electrolyte incorporated with tetracyanoethylene (TCNE) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). Compare with dielectric constant of pure PEO (k = 5), TCNE has high dielectric constant (k approximate to 148). The dielectric constant of polymer matrix increased to 50.83 by the incorporation TCNE into PEO. Hence, incorporating LiTFSI into PEO12-TCNE complex, the ion dissociation fraction was also increased from 42.61% to 77.88%. The DSC results showed that the melting temperature (T-m) shifted to low temperature region and glass transition temperature (T-g) also decreased. After incorporation of tetracyanoethylene, the maximum ionic conductivity was obtained as 1.11 x 10(-4) S/cm at room temperature. (C) 2020 Elsevier Ltd. All rights reserved.
Keywords:
Lithium ion battery
Polymer electrolyte
Dielectric constant
Ion dissociation
Tetracyanoethylene
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