Inorganic/organic compound functional porous isolating membrane and preparation method as well as lithium ion battery adopting inorganic/organic compound functional porous isolating membrane

A composite function, porous technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of safety performance degradation, impact on battery performance, battery chemical performance degradation, etc., to suppress shrinkage and deformation, reduce short circuit. risk, the effect of high mechanical strength

Active Publication Date: 2016-07-20
深圳市旭然电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the above that the presence of any trace of water in the battery will cause the decomposition reaction of the electrolyte salt to continue. As the battery cycle reaction proceeds, the generated fluoride and reaction by-products will seriously affect the performance of the battery, eventually leading to The attenuation of battery electrochemical performance and the decline of safety performance

Method used

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  • Inorganic/organic compound functional porous isolating membrane and preparation method as well as lithium ion battery adopting inorganic/organic compound functional porous isolating membrane
  • Inorganic/organic compound functional porous isolating membrane and preparation method as well as lithium ion battery adopting inorganic/organic compound functional porous isolating membrane
  • Inorganic/organic compound functional porous isolating membrane and preparation method as well as lithium ion battery adopting inorganic/organic compound functional porous isolating membrane

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Effect test

Embodiment 1

[0042] Preparation of Inorganic / Organic Composite Functionalized Porous Separator Membrane

[0043] The coating slurry formula is based on the weight percentage of the dry material. The coating slurry is composed of 4wt% styrene / acrylate copolymer emulsion, 4wt% lithium polyacrylate, 1wt% carboxymethyl cellulose sodium, and 91wt% inorganic ceramic particles. , where the inorganic ceramic particles are selected from Al 2 o 3 , and its particle size D50 is 0.6 μm to 1.0 μm. The water-emulsion polymer binder is selected from styrene / acrylate copolymer emulsion, its surface tension is 42 dyne / cm, and the contact angle of dry glue water drop is 125. o , with a glass transition temperature of 25 o c. The water-soluble polymer binder is lithium polyacrylate, the weight average molecular weight is about 100,000g / mol, the pH value of its 20wt% aqueous solution is about 5, and the glass transition temperature is about 120 o c. During the preparation of the slurry, the solvent is d...

Embodiment 2

[0063] The difference between embodiment 2 and embodiment 1 is the composition of coating slurry:

[0064] The coating slurry formula consists of four parts: 4wt% styrene / acrylate copolymer emulsion, 4wt% calcium polyacrylate, 1wt% carboxymethyl cellulose sodium, and 91wt% inorganic ceramic particles, in terms of weight percentage of dry material, of which inorganic ceramic Al 2 o 3 , and its particle size D50 is 0.6 μm to 1.0 μm. The water-emulsion polymer binder is selected from styrene / acrylate copolymer emulsion, its surface tension is 42 dyne / cm, and the contact angle of dry glue water drop is 125. o , with a glass transition temperature of 25 o c. The water-soluble polymer binder is calcium polyacrylate, the weight average molecular weight is about 100,000g / mol, the pH value of its 20wt% aqueous solution is about 5, and the glass transition temperature is about 135 o c. During the preparation of the slurry, the solvent is deionized water, wherein the weight of the ...

Embodiment 3

[0067] The difference between embodiment 3 and embodiment 1 is the composition of coating slurry:

[0068]The coating slurry formula is based on the weight percentage of the dry material. It consists of four parts: 4wt% styrene / acrylate copolymer emulsion, 4wt% polyacrylic acid / lithium polyacrylate, 1wt% carboxymethyl cellulose sodium, and 91wt% inorganic ceramic particles. Among them, the inorganic ceramic particles are selected from Al 2 o 3 , and its particle size D50 is 0.6 μm to 1.0 μm. The water-emulsion polymer binder is selected from styrene / acrylate copolymer emulsion, its surface tension is 42 dyne / cm, and the contact angle of dry glue water drop is 125. o , with a glass transition temperature of 25 o c. The water-soluble polymer binder is polyacrylic acid / lithium polyacrylate, the weight average molecular weight is about 100,000g / mol, the pH value of its 20wt% aqueous solution is about 5, and the glass transition temperature is about 115 o c. During the prepar...

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Abstract

The invention provides an inorganic / organic compound functional porous isolating membrane. The inorganic / organic compound functional porous isolating membrane comprises a porous substrate and an inorganic functional coating which is adhered to at least one surface of the porous substrate, wherein the inorganic functional coating is prepared from inorganic ceramic particles, a water-soluble macromolecular thickening agent, a water emulsion type polymer binding agent and a water soluble type polymer binding agent; the water emulsion type polymer binding agent is a macromolecular polymer with the surface tensile force of 40dyne / cm to 50dyne / cm, and a water drip contact angle of water emulsion type polymer binding agent dry glue is 100 degrees to 130 degrees; the water emulsion type polymer binding agent is a polar macromolecular polymer with the glass transition temperature of 100 DEG C to 150 DEG C. Therefore, the inorganic / organic compound functional porous isolating membrane has the advantages that the heat stability of the isolating membrane can be effectively improved, and the moisture content of the inorganic coating can also be reduced, so that the safety performance of a battery and the stability of long-period cycle are improved.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, more specifically, the present invention relates to an inorganic / organic composite functionalized porous separator and a preparation method thereof, and a lithium ion battery comprising the inorganic / organic composite functionalized porous separator Battery. Background technique [0002] Since the promotion of commercialization, lithium-ion batteries have been widely used as a variety of portable batteries due to their high energy density, high working voltage, long cycle life, no memory effect, green environmental protection, and flexible design of size and shape according to actual needs. The power supply of electronic appliances, these broad application fields and various practical needs have greatly promoted the development of lithium-ion batteries. [0003] At present, most of the separators used in lithium-ion batteries and lithium-ion polymer batteries are polyolefin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/446H01M50/451
CPCH01M10/0525H01M50/431H01M50/403Y02E60/10
Inventor 方园
Owner 深圳市旭然电子有限公司
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