新型聚乙烯醇缩甲醛基凝胶聚合物电解质的热稳定性

摘要

采用原位热聚合法制备了聚乙烯醇缩甲醛( PVFM)基凝胶聚合物电解质，通过差示扫描量热法( DSC)研究了PVFM基凝胶聚合物电解质的热稳定性，并利用热重-红外/质谱( TGA-FTIR/MS)联用技术比较研究了液态电解质和PVFM基凝胶聚合物电解质升温过程中逸出气体的成分及变化。结果表明，相比于液态电解质，凝胶聚合物电解质中PVFM热聚合产生的三维网络结构可以有效抑制有机溶剂的挥发，降低体系中HF的含量，从而改善电解质体系的热稳定性，提高其应用于锂离子电池的安全性能。%A novel polyvinyl formal(PVFM) based gel polymer electrolyte(GPE) was prepared by means of initiator free in-situ thermal polymerization technology. The thermal stability of electrolytes was studied using differential scanning calorimetry( DSC) . And the components of evolved gases from GPE and liquid electrolyte were comparatively analyzed by thermogravimetry-infrared spectrum/mass spectrometry( TGA-FTIR/MS) tech-nique during the heating process. The results show that the macroscopic physical network formed by PVFM after polymerization can prevent the organic solvents from evaporating and reduce HF content at high tempera-tures effectively. Overall, PVFM based GPE is a promising electrolyte to achieve the enhanced thermal stabili-ty and improved safety.