摘要
本文以1,4，5，8-萘四甲酸酐和对苯二胺为原料，使用水热法在200 ℃下反应5 小时，制备了聚酰亚胺（PI）。采用了红外光谱法（FTIR）和X射线衍射法（XRD）对其结构进行了表征，同时，组装了以PI为负极、硫酸镁水溶液为电解液、活性炭为正极的电池体系，测定PI的储镁性能。充电时，镁离子与负极PI发生还原反应，硫酸根离子嵌入到正极活性炭颗粒中，恒电流充放电测试的首次循环PI储镁的充电比容量为107.6 mAh·g-1，放电比容量为97.6 mAh·g-1，效率为87.91 %；100次循环后，放电比容量降为 66.2 mAh/g，库伦效率升高到97.65 %。最后，采用循环伏安法CV、EIS对PI电化学性能进行测试，证明PI具有一定的储镁性能。
关键词：聚酰亚胺；硫酸镁电解液；负极；镁离子电池
Preparation and electrochemical properties of Polyimide
Abstract
Polyimide (PI) was prepared from 1,4, 5, 8 naphthalene tetramethylanhydride and p-phenylenediamine as raw materials by hydrothermal reaction at 200 ℃ for many hours. The structure of PI was characterized by infrared spectroscopy (FTIR) and X-ray diffraction (XRD). At the same time, a battery system with PI as the negative electrode, magnesium sulfate solution as the electrolyte and activated carbon as the positive electrode was assembled to determine the magnesium storage performance of PI. During charging, magnesium ion and negative PI are reduced, and sulfate ion is embedded in positive activated carbon particles. In the first cycle of constant current charge and discharge test, the charge specific capacity of PI magnesium storage is 107.6 mAh·g-1, the discharge specific capacity is 97.6 mAh·g-1, and the efficiency is 87.91%. After 100 cycles, the discharge specific capacity decreased to mAh/g and the Coulomb efficiency increased to %. Finally, the electrochemical performance of PI was tested by cyclic voltammetry CV and EIS, which proved that PI had certain magnesium storage performance.
Key words: polyimide; Magnesium sulfate electrolyte; The cathode; Magnesium ion cell
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