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Lithium ion conducting gel film containing porous polymer framework and preparation method thereof

A porous polymer, conductive gel technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of low electrolyte absorption rate and retention rate, low conductivity, poor strength, etc., and achieve improved mechanical strength, Low environmental requirements and high efficiency

Inactive Publication Date: 2007-03-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problems of low electrolyte absorption and retention rate, low conductivity, high cost, and poor strength in the existing lithium-ion conductive gel electrolyte membrane, and promote the development of safe, high-performance, and low-cost lithium-ion battery technology

Method used

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  • Lithium ion conducting gel film containing porous polymer framework and preparation method thereof
  • Lithium ion conducting gel film containing porous polymer framework and preparation method thereof
  • Lithium ion conducting gel film containing porous polymer framework and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053] 1. Preparation of Porous Membrane Skeleton

[0054] The solution phase inversion method is used to prepare porous membranes, and the modification of polyvinylidene fluoride and polyethersulfone is realized by adding polypropylene glycol in the casting solution. The preparation method includes the following steps in sequence: (1) preparing the casting solution: adding dihydroxy Polypropylene glycol, polyvinylpyrrolidone, water, solvent and polyvinylidene fluoride or polyether sulfone are mixed and dissolved, and degassed to obtain a casting solution; (2) Scraping liquid film: scrape the casting solution on a stainless steel plate or steel strip to form Liquid film; (3) curing into film: immerse the stainless steel plate with liquid film in a coagulation bath to solidify into film; (4) cleaning and drying.

[0055] A porous membrane suitable for using gel membrane as a skeleton needs to have continuous microporous channels, symmetrical structure, high porosity on the memb...

Embodiment 1

[0091] Example 1: The various implementation conditions and the structure and performance of the obtained lithium ion conductive gel membrane are shown in Table 1.

[0092] Casting solution

Embodiment 2

[0093] Example 2: The various implementation conditions and the structure and performance of the obtained lithium ion conductive gel membrane are shown in Table 2.

[0094] Casting solution

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Abstract

The present invention discloses conducting lithium gel film containing porous polymer skeleton and its preparation process. The preparation process includes following steps: 1. preparing porous polypropylene glycol modified polyvinylidene fluoride or polyether sulfone film through phase conversion; 2. preparing electrolyte through mixing carbonate, lithium salt, polyglycol and diisocyanate at 10-20 deg.c; 3. soaking the porous film in the electrolyte at 10-20 deg.c for 10-30 min; and 4. treating electrolyte adsorbing porous film at 60 deg.c for 8-10 for cross-linking to form gel. The conducting lithium gel film has high strength, stable shape, high lithium salt electrolyte loading amount and conductivity of 10<-3>-10<-2> S / cm, and is suitable for use in polymer lithium cell with integrated diaphragm and electrolyte.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, in particular to a lithium ion conductive gel film containing a porous polymer skeleton and a preparation method thereof. Background technique [0002] Lithium-ion battery, also known as lithium secondary battery, is a rechargeable secondary power supply with high specific energy, excellent electrical performance, and can be made into various shapes. It is widely used in mobile phones, electric vehicles, notebook computers, Fields that require portable power such as photography / photography. With the continuous growth of demand in related industries, lithium-ion battery materials and technologies are in a stage of rapid development. Improving the safety, energy density and long life of lithium-ion batteries is the development direction of high-performance lithium batteries. In the core materials and technologies of lithium-ion batteries, the type and performance of the electrolyte s...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J3/24C08L27/16C08L81/06C08L71/08C08L39/06H01M10/40H01M2/18H01M10/0565H01M50/403H01M50/411H01M50/491H01M50/497
CPCY02E60/122Y02E60/10
Inventor 朱宝库崔振宇徐又一韩改格
Owner ZHEJIANG UNIV
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