溶剂对PEO基固态电解质制备与性能的影响

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英文篇名：Influence of solvent on preparation and performance of PEO solid electrolyte 作者：徐春曦 ; 张程 ; 郑媛媛 ; 靳承铀 ; 缪永华 英文作者：XU Chun-xi;ZHANG Cheng;ZHENG Yuan-yuan;JIN Cheng-you;MIAO Yong-hua;Zhongtian Energy Storage Technology Co., Ltd.; 关键词：固态电池 ; 聚合物固态电解质 ; 微观结构 ; 结晶度 ; 力学性能 ; 电化学性能 英文关键词：solid-state battery;;polymer solid electrolyte;;micro-structure;;crystalline;;mechanical properties;;electrical properties 中文刊名：DYJS 英文刊名：Chinese Journal of Power Sources 机构：中天储能科技有限公司; 出版日期：2019-03-20 出版单位：电源技术 年：2019 期：v.43;No.342 基金：江苏省重点研发计划-产业前瞻与共性关键技术项目(BE2016008-4) 语种：中文; 页：DYJS201903013 页数：4 CN：03 ISSN：12-1126/TM 分类号：36-38+140

摘要

采用溶液浇铸法制备了PEO基聚合物固态电解质,并通过X射线衍射(XRD)、扫描电镜、交流阻抗法等方法对不同溶剂制备固态电解质的结构、形貌、电导率以及锂离子迁移数等进行分析表征。结果表明,溶剂对固态电解质的微观结构存在着较大的影响,以丙酮、乙腈为溶剂制备的固态电解质(S_A)表面致密,具有最低的结晶度,而以NMP、乙腈为溶剂制备的固态电解质(S_N)结晶度最高。固态电解质的微观结构直接决定了其机械性能和电化学性能,SA的抗拉强度为2.219 MPa,在80℃下的离子电导率可达到8.3×10~(–4)S/cm。所制备固态电解质可应用于锂离子固态电池的制备与研究中。
        In this paper,PEO based polymer solid electrolyte films were prepared using a solution casting method.X-ray diffraction(XRD), SEM and the electrochemical impedance spectra(EIS) were used to study the micro-structure, morphology, ion conductivity and lithium-ion transference number of solid polymer electrolyte(SPE)prepared by different organic solutions. The results show that the solution has a large impact on the micro-structure of SPE. SPE prepared by acetone and acetonitrile(S_A) shows a dense surface with the lowest crystallinity, while SPE prepared by NMP and acetonitrile(S_N) shows the highest crystallinity. The micro-structure of SPEs directly determine their mechanical and electrical properties. The extension strength of S A film is approximately 2.219 MPa, and its ion conductivity at 80 ℃ reaches 8.3×10~(-4) S/cm. The as-prepared SPE can be a preferable candidate for Li-ion solid battery use.

引文

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