随着科学技术的进步，各种智能电子设备和电动车、电网体系迅速成长，人们对高能量密度和可充电电池系统的需求越来越大，锂离子电池也得到了长足的发展。目前市场上常用的锂离子电池由正负极、电解液和隔膜组成。由于电解液易挥发、泄露，因此电池容易发生短路甚至着火、爆炸等安全事故。固态电解质的出现很大程度上消除了这一安全隐患。固态电解质在电池中既能分隔正负极、防止内部短路，又能充当离子导体实现正负极活性物质之间的锂离子传递，已成为新能源领域的研究热点之一。目前固态电解质膜的制备方法主要包括有机溶剂浇铸、涂布和热模压等，这些方法普遍存在有机溶剂污染环境、制造周期长、成本高等问题。有鉴于此，文中提出了一种聚环氧乙烷（PEO）基复合固态电解质膜的拉伸应力诱导免溶剂熔融制备新方法，并采用SEM、XRD表征电解质膜的结晶形态和微观形貌，采用DSC表征膜的热性能，通过线性扫描伏安法、电导率测试来表征膜的电化学性能。结果表明，与简单的机械混合相比，采用文中提出的新方法制备的聚环氧乙烷/聚偏氟乙烯-六氟丙烯/双三氟甲磺酰亚胺锂（PEO/PVDF-HFP/LiTFSI）复合固态聚合物电解质膜的锂盐分散性更好。离子电导率测试结果表明：即便不使用有机溶剂，采用文中方法制备的复合固态聚合物电解质膜仍与采用溶液浇铸法制备的电解质膜的离子电导率相当；所加入的PVDF-HFP含量为30%时，PEO基固态聚合物电解质膜在60 ℃下的离子电导率达2.07×10^-4 S/cm，电化学稳定窗口超过5.0 V。

With the advancement of science and technology, various intelligent electronic devices, electric vehicles and grid systems have grown rapidly, and people have a growing demand for high energy density and rechargeable battery systems. In the past few decades, the development of lithium-ion batteries has made great progress. Lithium-ion batteries consisting of positive and negative electrodes, electrolytes and separators has the danger of volatile and leakage, leading to short circuit, fire, explosion and other safety accidents. The emergence of solid electrolytes has largely eliminated this safety hazard. The solid-state electrolyte can not only separate the positive and negative electrodes in the battery to prevent internal short circuits, but also act as an ion conductor to achieve the dual role of lithium ion transfer between positive and negative active substances. The solid-state electrolyte has become one of the research hotspots in the field of new energy. At present, the preparation methods of solid electrolyte membranes mainly include organic solvent casting/coating or hot molding. Organic solvents used by these methods are not friendly to the environment and these methods have disadvantages like high manufacturing cost and low production efficiency. To solve this problem, this paper proposed a new method for preparing PEO-based composite solid electrolyte membrane based on tensile stress and solvent-free melting, characterized the crystalline morpho-logy and microscopic morphology of the electrolyte membrane by SEM and XRD, and characterized the thermal properties of the membrane by DSC and FT-IR. The electrochemical performance of the membrane was characte-rized by linear sweep voltammetry and conductivity test. The results show that, as compared with simple mechanical mixing, the PEO/LiTFSI/PVDF composite solid electrolyte membrane prepared based on tensile stress and solvent-free melting has better lithium salt dispersibility. Ionic conductivity test shows that, even the proposed method does not use organic solvents, it is still comparable to the ionic conductivity of electrolyte membranes prepared by the solution method. When the content of PVDF-HFP is 30%, the ionic conductivity of the PEO-based solid polymer electrolyte membrane at 60 ℃ reaches 2.07×10^-4 S/cm, and the electrochemical stability window is 5.0 V.