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Polymer electrolyte membrane and preparation method thereof, and polymer cell

A technology of electrolyte membrane and polymer, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of residual impurities, difficulty in realization, and unstable structure of polymer electrolyte membranes, and achieve excellent mechanical strength and self-sufficiency. Small discharge, good for storage effect

Inactive Publication Date: 2013-09-18
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the complex and difficult method for preparing polymer electrolyte membranes with high mechanical strength and high conductivity in the prior art, and the prepared polymer electrolyte membranes have residual impurities and unstable structures.

Method used

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  • Polymer electrolyte membrane and preparation method thereof, and polymer cell
  • Polymer electrolyte membrane and preparation method thereof, and polymer cell
  • Polymer electrolyte membrane and preparation method thereof, and polymer cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of positive electrode

[0038] Add 100 parts by weight of LiCoO2, 3.5 parts by weight of binder polyvinylidene fluoride (PVDF), 4.5 parts by weight of conductive agent acetylene black into 70 parts by weight of N-methylpyrrolidone (NMP), and then fully mix in a vacuum mixer Stir to form a homogeneous cathode slurry. The resulting slurry was evenly coated on a 20 μm aluminum foil current collector by a coating machine, dried at 130° C., cut and rolled to obtain a positive electrode sheet with a thickness of about 125 μm.

[0039] Preparation of negative electrode

[0040] 100 parts by weight of negative electrode active material graphite, 1.0 parts by weight of conductive agent carbon black, 3.5 parts by weight of binder styrene-butadiene rubber (SBR) emulsion and 1.0 parts by weight of carboxymethyl cellulose (CMC), are added to 120 parts by weight of deionized , and then stirred in a vacuum mixer to form a stable and uniform negative electrode slurry. Th...

Embodiment 2

[0051] The positive electrode, negative electrode, electrolyte, polymer electrolyte membrane, and battery were prepared in the same manner as in Example 1, except that the preparation of the polymer electrolyte membrane was as follows:

[0052] 20wt% polyacrylonitrile (PAN) (molecular weight: 15w-19w; melting point: 154°C), 10wt% tetraethyl orthosilicate, 55wt% acetone, plasticizer 15wt% toluene, and a small amount of LiOH , at 40°C, stir evenly with a magnetic stirrer, and prepare a polymer solution (pH=7.5).

[0053] The above-mentioned polymer solution was dipped and coated on the surface of the separator, and the acetone and toluene were removed by ventilating and baking, so that a polymer electrolyte membrane with a thickness of 5 μm was formed on the surface of the separator.

[0054] The porosity, specific surface area and puncture strength of the polymer electrolyte membrane prepared above were measured by the same test method as above, and the test results are shown i...

Embodiment 3

[0056] The positive electrode, negative electrode, electrolyte, polymer electrolyte membrane, and battery were prepared in the same manner as in Example 1, except that the preparation of the polymer electrolyte membrane was as follows:

[0057] 20wt% polyethylene oxide (molecular weight 13w-17w; melting point 156°C), 10wt% tetraethyl orthosilicate, 55wt% acetone, plasticizer 15wt% toluene, and a small amount of LiOH, Stir evenly with a magnetic stirrer at 40°C to prepare a polymer solution (pH=7.5).

[0058] The above-mentioned polymer solution was dipped and coated on the surface of the separator, and the acetone and toluene were removed by ventilating and baking, so that a polymer electrolyte membrane with a thickness of 5 μm was formed on the surface of the separator.

[0059] The porosity, specific surface area and puncture strength of the polymer electrolyte membrane prepared above were measured by the same test method as above, and the test results are shown in Table 1. ...

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Abstract

The invention provides a polymer electrolyte membrane and a preparation method thereof, and a polymer cell. The polymer electrolyte membrane comprises silicon oxide and a polymer containing long chains with silicon-oxygen bonds, wherein the polymer containing long chains with silicon-oxygen bonds and silicon oxide are the products when the polymer matrix is reacted with silicate ester at the pH value of 6.5-8.0 in an organic solution; the polymer matrix consists of one or more polymers selected from polyvinylidene fluoride-hexafluoropropene, poly(ethylene oxide), polypropylene oxide, polyacrylonitrile, polyvinyl chloride, polystyrene, and polyethersulfones. The polymer electrolyte membrane in the invention possesses strong liquid absorption, strong ionic conductivity, and a small internal resistance. The prepared polymer cell possesses favorable discharge rate performance, excellent cycle performance and high-temperature storage performance, and a small self-discharge rate, which is good for storage, practical application and development of the polymer cell.

Description

technical field [0001] The invention relates to a polymer electrolyte membrane, a preparation method thereof and a polymer battery. Background technique [0002] Lithium-ion batteries have become the main energy source for current development due to their high operating voltage, high energy density, small size, no memory effect, and long life. At present, lithium-ion batteries have occupied a dominant position in the field of mobile electronic terminal equipment such as mobile phones, notebook computers, and portable digital devices, and have also been widely used in many fields such as electric vehicles, space technology, PDA, Bluetooth headsets, and military defense. applications, the performance requirements are getting higher and higher. [0003] At present, most of the lithium-ion secondary batteries at home and abroad use liquid electrolytes. Although liquid lithium-ion batteries have good high-rate charge-discharge performance and low-temperature performance, they al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/056H01M2/16C08L27/16C08L27/20C08L71/02C08L33/20C08L27/06C08L25/06C08L81/06C08K3/34
CPCY02E60/122Y02E60/10
Inventor 朱江民潘虹谷王晗王兴权潘福中
Owner SHANGHAI BYD
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