Lithium ion battery, diaphragm and preparation method thereof

A separator and polypropylene film technology, applied in the field of lithium-ion batteries, can solve the problems of inability to fix the size of the base film, weak interfacial bonding force, and close packing of ceramic particles, so as to improve the liquid absorption and liquid retention performance and prevent retraction deformation. Effect

Active Publication Date: 2018-11-13
欣旺达惠州动力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the ceramic particles have not undergone surface modification treatment, and the ceramic particles without modification treatment cannot form a good interface structure with the binder, and the interface bonding force is weak
When the ceramic particles with poor bonding effect are heated, the binder in the coating first softens and shrinks, the binder area is separated from the ceramic particles, and the ceramic particles become loose, resulting in the inability of the ceramic particles to form an effective and stable bond with the binder. Network structure, so the size of the base film cannot be fixed, and the improvement of heat shrinkage resistance is limited
Second, the particle size of the ceramic particles used is relatively uniform, and it is easy to cause close accumulation of ceramic particles after coating. The result is that the ceramic diaphragm is prone to local excessive surface density.
Third, the ceramic powder particles used are all solid structures, and the ceramic layer can store electrolyte except in the gaps between the ceramic particles, which can no longer provide extra storage space, and the improvement of liquid absorption performance is limited

Method used

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  • Lithium ion battery, diaphragm and preparation method thereof
  • Lithium ion battery, diaphragm and preparation method thereof
  • Lithium ion battery, diaphragm and preparation method thereof

Examples

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Effect test

preparation example Construction

[0047] The preparation method of the lithium ion battery of an embodiment, comprises the steps:

[0048] 1. Diaphragm preparation;

[0049] (1) Preparation of polyacrylate modified hollow ceramic nanotubes

[0050] (a) Ultrasonically disperse the hollow ceramic nanotubes in a solvent, add a silane coupling agent after heating, adjust the pH with ammonia water, and react for a period of time under mechanical stirring. The product is separated and dried to obtain halloysite nanotubes modified by silane coupling agent.

[0051] (b) Add the prepared coupling agent-modified hollow ceramic nanotubes, deionized water, emulsifier, and acrylate monomer into the reactor for high-speed stirring and dispersion, heat up and slowly add the diluted potassium persulfate aqueous solution dropwise. React in the atmosphere. After the reaction is finished, the product is washed and dried to obtain polyacrylate modified hollow ceramic nanotubes.

[0052] (2) Preparation of modified hollow cera...

Embodiment 1

[0081] Diaphragm preparation:

[0082] (1) Preparation of polyacrylate modified hollow ceramic nanotubes

[0083] (a) Take 40.00g of halloysite nanotubes and add them to 500ml of 95% ethanol for ultrasonic dispersion for 2h, then transfer them to a three-necked flask, and add 2.00g of γ-(methacryloyloxy)propyltrimethoxysilane at one time, The temperature was raised to 50° C., the pH was further adjusted to 7.0 with ammonia solution, and the reaction was carried out for 4 hours under mechanical stirring. After the reaction is finished, the halloysite nanotubes modified by the coupling agent are obtained by centrifuging, washing and drying. The reaction formula is as follows:

[0084]

[0085] (b) Take 30.00g coupling agent modified halloysite nanotubes, 0.08g sodium dodecylbenzenesulfonate, 300ml deionized water, 4.00g methyl methacrylate monomer, and stir at a high speed at 1500r / min . The temperature was raised to 60° C., and 1.50 g of 2% potassium persulfate dilute so...

Embodiment 2

[0090] Diaphragm preparation:

[0091] (1) Preparation of polyacrylate modified hollow ceramic nanotubes

[0092] (a) Take 40.00g of halloysite nanotubes and add them to 500ml of 95% ethanol for ultrasonic dispersion for 2h, then transfer them to a three-necked flask, and add 4.00g of γ-(methacryloyloxy)propyltrimethoxysilane at one time, The temperature was raised to 60° C., the pH was further adjusted to 8.0 with ammonia solution, and the reaction was carried out under mechanical stirring for 6 hours. After the reaction is finished, the halloysite nanotubes modified by the coupling agent are obtained by centrifuging, washing and drying. The reaction formula is as follows:

[0093]

[0094] (b) Take 30.00 g of halloysite nanotubes modified by coupling agent, 0.08 g of fatty alcohol polyoxyethylene ether, 300 ml of deionized water, and 3.00 g of ethyl acrylate monomer, and stir at 2000 r / min at high speed. The temperature was raised to 70° C., and 1.50 g of 2% potassium ...

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Abstract

The invention discloses a lithium ion battery, a diaphragm and a preparation method thereof. The diaphragm comprises a base material and a coating arranged on the surface of the base material in a coating manner, wherein the material of the coating comprises polyacrylate modified hollow ceramic nanotubes.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery, a diaphragm and a preparation method thereof. Background technique [0002] With the rapid development of the electric vehicle industry, the development of power lithium-ion batteries has attracted more and more attention from researchers. As one of the four main materials of lithium-ion batteries, the diaphragm plays an important role. Improving the thermal shrinkage performance of the separator can effectively reduce the short circuit risk caused by the shrinkage of the separator due to the increase in temperature, and improve the safety of the lithium-ion battery during use. Improving the liquid absorption and liquid retention performance of the separator can reduce the electrolyte soaking time, improve production efficiency, and improve battery cycle performance. Separators are usually manufactured by melting PE / PP through dry or wet processing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525B82Y30/00
CPCB82Y30/00H01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 林峰张耀程忠陈辉
Owner 欣旺达惠州动力新能源有限公司
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