Effect of End Groups on Ion Transport and Heat Transfer Properties of Solid Polymer Electrolytes
In this paper,the ion diffusion coefficients and thermal conductivity of solid polymer elec-trolytes(SPE)containing poly(ethylene oxide)(PEO)and lithium bis(trifluoromethanesulfonylimine)salt(LiTFSI)with different end group of PEO are investigated and the structural properties are an-alyzed to study the ion transport and heat conduction mechanisms.The results showed that the poly(ethylene glycol)dimethyl ether(PEGDM)based SPE has better ion transport performance because more free lithium ions can be transported.However,the thermal conductivity of PEGDM is worse because the phonon spectrum is shifted to higher frequencies,which suggests that enhanced high-frequency phonon scattering leads to lower thermal conductivity.These findings provide valu-able guide for PEO-LiTFSI electrolyte design.
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