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A kind of gel polymer electrolyte diaphragm, lithium ion battery and preparation method thereof

A technology of electrolyte diaphragm and gel polymer, which is applied in the field of lithium-ion batteries, can solve the problems of high production cost, low liquid absorption rate, poor ion conductivity, etc., and achieve low production cost, strong liquid absorption, and high adhesion Effect

Active Publication Date: 2020-11-17
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a gel polymer electrolyte diaphragm, a lithium ion battery and a preparation method thereof, which are used to solve the problem of the lithium battery diaphragm in the prior art being unenvironmentally friendly and having a low liquid absorption rate. , Poor ion conductivity, lack of adhesion, resulting in low hardness and poor safety of the battery, and high production costs

Method used

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  • A kind of gel polymer electrolyte diaphragm, lithium ion battery and preparation method thereof
  • A kind of gel polymer electrolyte diaphragm, lithium ion battery and preparation method thereof
  • A kind of gel polymer electrolyte diaphragm, lithium ion battery and preparation method thereof

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preparation example Construction

[0032] Such as figure 1 As shown, the present invention provides a kind of preparation method of gel polymer electrolyte membrane, and described preparation method comprises the following steps at least:

[0033] First, step S11 is performed, dissolving the high molecular polymer powder in the first solvent to obtain a high molecular polymer solution.

[0034] As an example, the polymer micropowder includes one of polyvinyl alcohol and polyethylene oxide.

[0035] The high molecular polymer micropowder is a soluble high molecular micropowder, and its function is to absorb the electrolyte to form an ion-conducting gel polymer.

[0036] As an example, the first solvent includes deionized water. Certainly, in other embodiments, other suitable solvent types may also be used, but for environmental protection, deionized water is preferably used as the first solvent.

[0037] Then execute step S12, dissolving the stabilizer in the second solvent to obtain a stabilizer solution.

...

Embodiment 1

[0070] Preparation of gel polymer electrolyte separator:

[0071] Preparation of polymer micropowder solution: 50 g of polyvinyl alcohol was added to 950 g of deionized water, and stirred for 30 minutes to form a polyvinyl alcohol solution.

[0072] Stabilizer solution preparation: Add 20 g of sodium carboxymethyl cellulose to 980 g of deionized water and stir for 90 minutes to form a sodium carboxymethyl cellulose solution.

[0073] Take the above 500g polyvinyl alcohol solution and mix it with 150g sodium carboxymethylcellulose solution, then add deionized water and stir for 30 minutes to form a polymer electrolyte slurry.

[0074] Then, the prepared polymer electrolyte slurry was coated on a 12um substrate PE separator by gravure transfer coating, and dried in an oven to form a 2um-thick coating on one side of the gel polymer electrolyte separator.

[0075] Preparation of positive electrode sheet: Add lithium cobalt oxide, conductive carbon, and binder polyvinylidene fluor...

Embodiment 2

[0080] The processes of positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell molding are the same as in Example 1, but the gel polymer electrolyte separator is prepared by the following method:

[0081] Preparation of polymer micropowder solution: 50 g of polyvinyl alcohol was added to 950 g of deionized water, and stirred for 30 minutes to form a polyvinyl alcohol solution.

[0082] Stabilizer solution preparation: Add 20 g of sodium carboxymethyl cellulose to 980 g of deionized water and stir for 90 minutes to form a sodium carboxymethyl cellulose solution.

[0083] Take the above 500g polyvinyl alcohol solution and mix it with 50g sodium carboxymethylcellulose solution, then add deionized water and stir for 30 minutes to form a polymer electrolyte slurry.

[0084] Then, the prepared polymer electrolyte slurry is coated on a 14um base PE separator by gravure transfer coating, and then dried in an oven to form a double-sided coated gel polymer...

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Abstract

The invention provides a gel polymer electrolyte diaphragm, a lithium ion battery and a preparation method thereof. The preparation method of the diaphragm comprises the following steps: dissolving apolymer micro powder in a first solvent to obtain a polymer solution; dissolving the stabilizer in the second solvent to obtain a stabilizer solution; Mixing the high molecular polymer solution and the stabilizer solution and diluting to prepare polymer electrolyte slurry; The polymer electrolyte slurry is coated on at least one surface of a diaphragm substrate, and dried to form a polymer electrolyte coating to obtain a gel polymer electrolyte diaphragm. The gel polymer electrolyte diaphragm made of the aqueous polymer has the characteristics of high adhesion, environmental protection, strongliquid absorption and high ionic conductivity, and can greatly save cost. The lithium ion battery is prepared by utilizing the separator of the invention, and polymer gel is formed through a gelatinization process, and the electrolyte is tightly locked in the polymer gel, and the lithium ion is used as a channel for directional movement.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a gel polymer electrolyte diaphragm, a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high average output voltage, small self-discharge, no memory effect, long service life, and no toxic and harmful substances, and are used more and more widely. They are called green batteries. At present, the domestically produced polymer lithium-ion battery is a liquid lithium-ion soft-pack battery (soft-pack battery). Due to the use of liquid electrolyte, this battery has poor thermal stability, and is prone to swelling or explosion due to pressure shock, gravity shock, acupuncture, etc. The safety performance is low; the polymer batteries (solid-state batteries) produced by internationally renowned brands have all solved the above problems, but the production of the above...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 程跃黄灿灿陈永乐王治学王连杰
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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