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A polyimide lithium battery diaphragm, a preparation method thereof, and a lithium battery comprising the diaphragm

A lithium polyimide and battery separator technology, which is applied in battery pack parts, circuits, electrical components, etc., can solve the problems of inability to meet the use requirements of lithium ion batteries, low mechanical strength and puncture performance, and large pore diameter of the separator. Achieve the effect of small pore size, high production efficiency and uniform distribution

Inactive Publication Date: 2019-01-01
RUYUAN DONGYANG LIGHT FLUORINE RESIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its mechanical strength and puncture performance are relatively low, which still cannot meet the requirements of lithium-ion batteries, and the prepared separator has a large pore size, uneven distribution, and increased leakage current.

Method used

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  • A polyimide lithium battery diaphragm, a preparation method thereof, and a lithium battery comprising the diaphragm
  • A polyimide lithium battery diaphragm, a preparation method thereof, and a lithium battery comprising the diaphragm
  • A polyimide lithium battery diaphragm, a preparation method thereof, and a lithium battery comprising the diaphragm

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preparation example Construction

[0043] In order to obtain the above-mentioned polyimide lithium battery diaphragm of the present application, another aspect of the present invention provides a kind of preparation method of polyimide lithium battery diaphragm, can comprise the steps:

[0044] Preparation of ceramic powder surface-modified by amino coupling agent;

[0045] Condensing 5-20 parts of said ceramic powder, 30-50 parts of binary organic amine, 30-50 parts of binary organic acid anhydride and 2-5 parts of polyamino crosslinking agent in an organic solvent by weight Reaction, to obtain polyamic acid solution;

[0046] Adding a porogen to the polyamic acid solution, stirring evenly, and vacuum defoaming to obtain a coating solution;

[0047] Coating the coating solution on the base material to form a polyamic acid film, passing through a coagulation bath and removing the porogen to obtain a coagulated film;

[0048] imidization of the solidified membrane.

[0049] According to some embodiments of th...

Embodiment 1

[0065] Example 1: Preparation of polyimide lithium battery separator PI-1

[0066] The concrete method of this embodiment is as follows:

[0067] 1. In terms of parts by mass, add 10 parts of ceramic powder (alumina, 0.5 μm) into 2M NaOH solution (200 parts), soak for 2 hours, and dry at 70°C.

[0068] 2. Add 2 parts of KH550 coupling agent to 100 parts of 95% ethanol aqueous solution, and stir at 50°C for 2h. Then add 10 parts of alumina ceramic powder, react at room temperature for 2 hours, filter, and dry at 70° C. to obtain alumina ceramic powder of surface modification coupling agent.

[0069] 3. Add 10 parts of ceramic powder of surface modification coupling agent to 500 parts of N-methylpyrrolidone (NMP), and ultrasonically disperse at room temperature for 1 hour to prepare a ceramic solution of surface modification coupling agent.

[0070] 4. Add 40 parts of pyromellitic dianhydride (PMDA), 36 parts of 4,4'-diaminodiphenyl ether (ODA) and 2 parts of 1,3,5-triaminoben...

Embodiment 2

[0074] Example 2: Preparation of Polyimide Lithium Battery Diaphragm PI-2

[0075] The concrete method of this embodiment is as follows:

[0076] 1. In parts by mass, add 20 parts of ceramic powder (alumina, 0.5 μm) into 2M NaOH solution (200 parts), soak for 2 hours, and then dry at 70°C.

[0077] 2. Add 2 parts of KH550 coupling agent to 100 parts of 95% ethanol aqueous solution, and stir at 50°C for 2h. Then add 20 parts of alumina ceramic powder, react at room temperature for 2 hours, filter, and dry at 70° C. to obtain alumina ceramic powder of surface modification coupling agent.

[0078] 3. Add 20 parts of ceramic powder of surface modification coupling agent to 500 parts of N-methylpyrrolidone (NMP), and ultrasonically disperse at room temperature for 1 hour to prepare a ceramic solution of surface modification coupling agent.

[0079] 4. Add 40 parts of pyromellitic dianhydride, 36 parts of 4,4'-diaminodiphenyl ether and 2 parts of 1,3,5-triaminobenzene into the cer...

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Abstract

The present application relates to the field of lithium ion battery materials. Disclosed are a polyimide lithium battery diaphragm, a preparation method thereof, and a lithium battery comprising the diaphragm. The polyimide lithium battery diaphragm comprises: 30-50 parts of diorganic amine, 30-50 parts of dibasic organic anhydride, 2-5 parts of a polyamino crosslinking agent and 5-20 parts of polyimide formed by reaction of amino coupling agent surface modified ceramic powder and imidization. The polyimide diaphragm can form cross-linking between polymer molecular chains in the subsequent imidization process by adding polyamino crosslinking, which greatly enhances the mechanical strength; by ceramic powder added with the surface-modified coupling agent, the puncture strength of polyimidediaphragm can be greatly improved, and the pore size of diaphragm can be ensured to be small, the distribution is uniform, and the leakage current problem of a battery can be solved. At the same time,the polyimide lithium battery diaphragm has high production efficiency and is favorable for industrial large-scale production.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials. More specifically, it relates to a ceramic cross-linked polyimide lithium battery diaphragm, a preparation method thereof, and a lithium battery comprising the diaphragm. Background technique [0002] Due to the advantages of high power density, long cycle life, low self-discharge rate, stable discharge voltage, no memory effect and fast charge and discharge, lithium-ion batteries have become the representative of high-performance batteries at present. Cameras, MP3 and other small home appliances and power batteries have been widely used. [0003] Traditional lithium-ion battery separators are mainly polyolefin microporous separators, which are prone to thermal shrinkage when heated, resulting in a short circuit between the positive and negative electrodes, which poses a great safety hazard. Moreover, the low porosity, liquid holding rate and poor electrolyte wettability of polyolef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/423H01M50/434
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 李义涛程堂剑云晧陈志钊邓永茂张凌飞
Owner RUYUAN DONGYANG LIGHT FLUORINE RESIN CO LTD
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