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Micro joint gel state lithium ion battery polymer electrolyte film and its making method

A technology for lithium ion batteries and electrolyte membranes, which is applied in the field of micro-crosslinked polymer membranes containing nitrile groups and carboxyl groups and their preparation, can solve the problems of poor mechanical properties, difficulty in large-scale industrial production, and low electrical conductivity, and achieves good The effect of microporous structure and liquid absorption rate, good ion transport performance, excellent thermal stability performance

Active Publication Date: 2008-02-20
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A variety of gel-type polymer electrolytes have been developed, such as polyoxyethylene ether (PEO) (US Patent 5540741), polyacrylonitrile (PAN) (US Patent 5219679), polymethacrylate (PMNA) (US Patent6232019) and polyvinylidene fluoride (PVDF) (US Patent 5296318), etc., but polymer electrolysis
[0004] The qualitative performance is still unsatisfactory, and there are the following problems: (1) the electrical conductivity is low at room temperature; (2) the mechanical strength needs to be improved; (3) the preparation process is relatively complicated, and the environmental requirements are harsh, etc.
The Bell Research Institute of the United States announced a preparation method of gel polymer electrolyte in 1994, that is, the Bellcore method (US Patent 5296318, US Patent 5196179). The Bellcore method uses solvent extraction and plasticization, which is complex in operation and high in environmental requirements. Industrial production has brought difficulties, and although the polymer electrolyte obtained by the phase transfer method (US Patent 5387378) has high ion conductivity, its mechanical properties are poor, and it is difficult to adapt to battery production

Method used

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  • Micro joint gel state lithium ion battery polymer electrolyte film and its making method
  • Micro joint gel state lithium ion battery polymer electrolyte film and its making method
  • Micro joint gel state lithium ion battery polymer electrolyte film and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A. Under the nitrogen environment of normal temperature and pressure, the polymer dispersant polyvinyl alcohol of 0.1% by weight, the inorganic dispersant of 0.1% by weight are the gas phase white carbon black below 300 nanometers and the deionization of 71.24% by weight Add water into the reactor with temperature control, pressure control and stirring, stir and dissolve at 500r / min, and then raise the temperature to 60°C;

[0041] B, 0.03% weight part polymerization initiator azobisisobutyronitrile and 0.03% weight part molecular weight are the macromolecular crosslinking agent polyethylene glycol dimethacrylate of 200 to be added to 28.5% weight part polymer monomer In the mixed solution of methyl methacrylate and acrylonitrile, wherein the mass ratio of methyl methacrylate to acrylonitrile is 2:8, stirring and dissolving;

[0042] C. Slowly add B to the above-mentioned A reactor, drop it within 30 minutes, then react at 60°C for 5 hours, filter, wash with deionized w...

Embodiment 2

[0063] With embodiment 1, just the macromolecular dispersant polyvinyl alcohol of 0.1% weight part and the nanoscale gas phase silica of the inorganic dispersant of 0.1% weight part in the A step are changed into the polymer dispersant polyvinyl alcohol of 0.3% weight part Ethylene glycol and 0.2% by weight of the inorganic dispersant nano-TiO 2 ; The deionized water of 71.24% by weight is changed to the deionized water of 64.24% by weight; The stirring speed of 100r / min is changed to 400r / min, and the temperature is raised to 70°C;

[0064] 0.03% by weight of the polymerization initiator azobisisobutyronitrile in the B step is replaced by 0.5% by weight of benzoyl peroxide; 0.03% by weight of the polymer cross-linking agent polyethylene glycol dimethyl Acrylate is replaced by 0.5% by weight of polyethylene glycol dipropyl acrylate with a molecular weight of 20,000; 28.5% by weight of the mixed solution of methyl methacrylate and acrylonitrile of the polymer monomer is replace...

Embodiment 3

[0070] With embodiment 1, just the macromolecule dispersant polyvinyl alcohol of 0.1% weight part and the fumed white carbon black of the inorganic dispersant nanometer level of 0.1% weight part in the A step, change the polymer dispersant fiber of 0.2% weight part Plain ether and the magnesium carbonate of the inorganic dispersant nanoscale of 0.15% weight part; The deionized water of 71.24% weight part is changed into the deionized water of 67.75% weight part; 100r / min stirring speed is changed into 250r / min, is warming up to 65 ℃;

[0071] 0.03% by weight of the polymerization initiator azobisisobutyronitrile in the B step is changed to add 0.2% by weight; 0.2% weight part molecular weight is the polyethylene glycol diethyl acrylate of 10000; The methyl methacrylate of 28.5% weight part polymer monomer and the mixed solution of acrylonitrile are changed into the mixed solution of 31.5% weight part; Wherein methyl The mass ratio of methyl acrylate to acrylonitrile is 3:7; ...

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Abstract

The utility model relates to a polymer electrolyte film for a micro cross-linking gel state lithium-ion battery and a preparation method, which is used for making the battery. The utility model discloses the poly-acrylonitrile-methyl methacrylate with the cross-linking degree of 0.1 to 0.4 % is obtained after suspension polymerization with the monomer component mass ratio of a methyl methacrylate and an acrylonitrile of 1:9 to 4:6, then the poly-acrylonitrile-methyl methacrylate is dissolved by a polar organic solvent and coated on a formed die, finally the micro cross-linking degree polymer electrolyte film is obtained when the film is removed from the formed die, the thickness of the film is 20 to 50um, the tensile strength is 7 to 22Mpa, and the average hole diameter is 0.1to 3um. The utility model has advantages of good conductivity, good absorbing capability, good heat stability, good electrochemical stability and good mechanical property under the ambient temperature, and simple manufacturing operation, high transforming rate of polymer, economy and environmental friendliness.

Description

technical field [0001] The invention relates to a micro-crosslinked polymer electrolyte membrane and a preparation method thereof, in particular to a micro-crosslinked polymer membrane containing nitrile and carboxyl groups and a preparation method thereof. Background technique [0002] Since the 1990s, lithium-ion batteries with liquid electrolytes have been widely used in various electronic appliances due to their unique advantages such as high energy, high operating voltage, wide application temperature range, no heavy metal pollution, and good safety performance. Polymer lithium-ion battery is a new type of battery developed on the basis of liquid lithium-ion batteries. In addition to the advantages of liquid lithium-ion batteries, it also has the advantage of better safety performance due to the use of an electrolyte that is not easy to flow. It can be made into ultra-thin batteries of any shape and size, so it has a wider range of applications. At present, polymer lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/18C08J5/22C08J5/18
CPCY02E60/122Y02E60/10
Inventor 王国忠张若昕范进雷刘建生
Owner GUANGZHOU TINCI MATERIALS TECH
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