Promote the conductivity of solid polymer electrolyte at room temperature by constructing a dual range ionic conduction path  

作　　者：Ruiyang Li Haiming Hua Yuejing Zeng Jin Yang Zhiqiang Chen Peng Zhang Jinbao Zhao 

机构地区：[1]College of Chemistry and Chemical Engineering,State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle,State Key Laboratory of Physical Chemistry of Solid Surfaces,Engineering Research Center of Electrochemical Technology,Ministry of Education,Collaborative Innovation Center of Chemistry for Energy Materials,Xiamen University,Xiamen 361005,Fujian,China [2]College of Energy,Xiamen University,Xiamen 361102,Fujian,China

出　　处：《Journal of Energy Chemistry》2022年第1期395-403,I0011,共10页能源化学（英文版）

基　　金：support from the National Natural Science Foundation of China[22021001,21875195];the Fundamental Research Funds for the Central Universities[20720190040];the Key Project of Science and Technology of Xiamen[3502Z20201013]。

摘　　要：Poly(ethylene oxide)(PEO)is a classic matrix model for solid polymer electrolyte which can not only dissociate lithium-ions(Li^(+)),but also can conduct Li^(+) through segmental motion in long-range.However,the crystal aggregation state of PEO restricts the conduction of Li^(+) especially at room temperature.In this work,an amorphous polymer electrolyte with ethylene oxide(EO)and propylene oxide(PO)block structure(B-PEG@DMC)synthesized by the transesterification is firstly obtained,showing an ionic conductivity value of 1.1×10^(5) S/cm at room temperature(25℃).According to the molecular dynamics(MD)simulation,the PO segments would lead to an inconsecutive and hampered conduction of Li^(+),which is not beneficial to the short range conduction of Li^(+).Thus the effect of transformation of aggregation state on the improveme nt of ionic conductivity is not eno ugh,it is n ecessary to further consider the differe nt coupled behaviours of EO and PO segments with Li^(+).In this way,we blend this amorphous polymer(B-PEG@DMC)with PEO to obtain a dual range ionic conductive solid polymer electrolyte(D-SPE)with further improved ionic conductivity promoted by constructing a dual range fast ionic conduction,which eventually shows a further improved ionic conductivity value of 2.3×10^(5) S/cm at room temperature.

关 键 词：Solid polymer electrolyte Amorphous polymer Ionic conductivity Room temperature Arrhenius equation 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]