Polyimide material as well as preparation method and application thereof
A polyimide and reaction technology, applied in the field of polymer preparation, can solve the problems of low negative electrode electrochemical capacity, unstable oxygen and hydrogen-oxygen, and low battery cycle life, and achieve the effect of high specific capacity and stable cycle times.
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Embodiment 1
[0104] The preparation of embodiment 1 polyimide
[0105] Step A: Using N,N-dimethylformamide (DMF) as a solvent, add 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTCDA) and urea at a molar ratio of 1:1 to obtain 1,4, The total concentration of 5,8-naphthalene tetracarboxylic dianhydride and urea is 50g / 500ml. The reaction vessel is a glass flask. Under the protection of argon, the reactant is kept at 90°C for 2 hours, and then heated to 150°C. And react at this temperature for 6 hours.
[0106] Step B: Collect the resultant and dry it under vacuum at 200° C. to obtain a dry powder, which is designated as polyimide sample 1.
Embodiment 2
[0108] It is basically the same as Example 1, the only difference is that the reactant is directly heated to 150° C., and reacted at this temperature for 6 hours, and the obtained product is recorded as polyimide sample 2.
Embodiment 3
[0110] It is basically the same as in Example 1, except that 1,4,5,8-naphthalene tetracarboxylic dianhydride is replaced by pyromellitic dianhydride, and the obtained product is designated as polyimide sample 3.
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