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Organic polymer particle coated composite diaphragm and preparation method thereof

A technology of organic polymers and composite diaphragms, which is applied in structural parts, secondary battery repair/maintenance, electrical components, etc., and can solve the problems of poor safety of polymer electrolytes and large self-discharge of batteries

Pending Publication Date: 2021-06-25
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of large self-discharge of the battery cell and poor safety of the polymer electrolyte caused by the high content of metal impurities in the existing diaphragm, the purpose of the present invention is to provide a low metal foreign matter content, including a porous structure substrate, containing organic polymers Coated composite membrane with porous active layer of particles and binder polymer and method for its preparation

Method used

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  • Organic polymer particle coated composite diaphragm and preparation method thereof
  • Organic polymer particle coated composite diaphragm and preparation method thereof

Examples

Experimental program
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Embodiment 1～5

[0032] Examples 1-5: A preparation method of organic polymer particle-coated composite diaphragm

Embodiment 1

[0034] The organic particle (polyvinylidene fluoride-co-trichloroethylene / cyanoethyl pullulan) composite lithium-ion battery coating diaphragm of this embodiment is uniformly coated with a porous active coating on the surface of the polyethylene substrate of the lithium-ion battery diaphragm The porous active coating coated with organic particles is obtained by mixing and drying the following substances according to mass percentage: 55% acetone, 7% binder PVDF-CTFE, 3% binder cyanoethyl pullulan, poly Phenyl sulfide PPS granules 35%.

[0035] In this embodiment, the organic particle is polyphenylene sulfide, and its particle size D50 is 0.5-20 μm.

[0036] The preparation method of organic particle coating composite membrane of the present invention is characterized in that, comprises the following steps:

[0037] (1) Add acetone to the high-speed dispersing equipment tank according to the above-mentioned mass percentage distribution ratio, start the stirring function of the ...

Embodiment 2

[0043]Example 1 was repeated to prepare an organic particle (polyvinylidene fluoride-co-trichloroethylene / cyanoethyl polyvinyl alcohol) composite membrane, except that cyanoethyl polyvinyl alcohol was used instead of cyanoethyl pullulan.

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Abstract

The invention discloses an organic particle coated composite diaphragm which comprises a porous structure substrate and a mixed porous active layer containing organic polymer particles and an adhesive polymer; the organic polymer particles have the characteristics of low metal impurity content, high temperature resistance, corrosion resistance and low water absorption, and cannot be dissolved in electrolyte and organic polar solvents. The invention also discloses a preparation method of the organic particle coated composite diaphragm. The risk of high content of metal foreign matters in the diaphragm can be reduced, and the safety and stability of a battery can be improved.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to an organic particle-coated composite diaphragm and a preparation method thereof. Background technique [0002] At present, the country is vigorously developing clean energy. Lithium-ion batteries have the characteristics of secondary cycle and high capacity density, and are widely used in new energy vehicles, energy storage, communication and other fields. However, the disadvantage of this type of lithium secondary battery is that the organic electrolyte used is inflammable, which will cause ignition and explosion of the battery when the battery is thermally out of control; and the process for manufacturing this type of battery is complicated. Lithium-ion polymer batteries are currently considered as one of the next-generation batteries because they solve the above-mentioned disadvantages of lithium-ion batteries. However, Li-ion polymer batteries have a relatively lower batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/411H01M50/403H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 程跃李井泉王伟强徐萍庄志
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD