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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.

Inactive Publication Date: 2020-04-07
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, lithium titanium phosphate negative electrode materials have been developed at home and abroad for use in aqueous lithium-ion batteries, but this material is unstable to oxygen and hydroxide in aqueous solution (oxygen cycle problem), so the battery cycle life is low
There are also scientific research teams developing aqueous sodium-ion batteries, using sodium titanium phosphate and Prussian blue as negative electrodes, but the electrochemical capacity of the negative electrodes is too low

Method used

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  • Polyimide material as well as preparation method and application thereof
  • Polyimide material as well as preparation method and application thereof
  • Polyimide material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a polyimide material as well as a preparation method and application thereof. The polyimide material is generated by taking N, N-dimethylformamide, N-methylpyrrolidone and thelike as solvents and reacting anhydrides such as 1, 4, 5, 8-naphthalenetetracarboxylic dianhydride, pyromellitic dianhydride and 1, 2, 4, 5-cyclohexane tetracarboxylic dianhydride with urea. The polyimide material shows relatively high specific capacity and stable cycle index in an aqueous lithium ion half battery. In the future, the material can be matched with more mature positive electrode materials to construct a high-energy-density aqueous lithium ion total battery.

Description

technical field [0001] The application relates to a polyimide material and its preparation method and application, belonging to the field of polymer preparation. Background technique [0002] At present, electrochemical energy storage technology has gradually been recognized by the new energy industry because of its high energy conversion efficiency, safe use, and flexible application, which is in line with the development direction of clean energy today. Among various energy storage methods, secondary batteries are the most convenient to use and maintain, and the installed capacity is increasing year by year. Currently commercially used energy storage secondary batteries are mainly lead-acid batteries, flow batteries and lithium-ion batteries. Traditional lead-acid batteries have a short lifespan and are not environmentally friendly. The negative electrode uses metallic lead (Pb), and lead sulfate (PbSO 4 ) passivation layer, which will cause its capacity to decay, and th...

Claims

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Application Information

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IPC IPC(8): C08G73/10H01M4/60
CPCC08G73/1082C08G73/1007H01M4/602Y02E60/10
Inventor 吴志连李忆非李书顶张旭锋王敏刚王耀国
Owner NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST
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