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Diaphragm of lithium battery and preparation method thereof

A lithium battery separator and base film technology, which is applied in battery pack components, separators/films/diaphragms/spacers, circuits, etc. Short circuit, the effect of preventing heat shrinkage

Inactive Publication Date: 2017-06-23
XUCHENG FUJIAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a new type of lithium-ion battery diaphragm to solve the safety problem that the battery generates heat and is easy to short circuit

Method used

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  • Diaphragm of lithium battery and preparation method thereof
  • Diaphragm of lithium battery and preparation method thereof
  • Diaphragm of lithium battery and preparation method thereof

Examples

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preparation example Construction

[0038] Such as figure 2 In the illustrated embodiment, the present invention also provides a method for preparing a lithium battery separator, which includes the following steps: S202 Take 90-93 parts by weight of ceramic material and add it to deionized water, stir and disperse evenly, and then add 7-10 parts by weight of the first Binder, stir and mix evenly to obtain ceramic slurry; S204 takes 92-95 parts by weight of hot-melt polymer material, 5-8 parts by weight of the second binder, add deionized water and mix and stir to obtain hot-melt polymer Material slurry, S206 coating the prepared ceramic slurry and hot-melt polymer slurry on the same side of the base film by gravure roll coating;

[0039] The first binder and the second binder include polyvinyl alcohol, epoxy resin or polyvinylpyrrolidone.

[0040] Further, it specifically includes the steps of coating the prepared ceramic slurry on one side of the base film by gravure roll coating, and obtaining a ceramic coat...

Embodiment 1

[0052] Dissolve the coupling agent in water for hydrolysis, add acetic acid as a hydrolysis catalyst, adjust the pH to 3.5-5.5, and react at a constant temperature of 30°C for 1 hour, add the pre-dispersed porous ceramic material into the solution, stir and react for 1.5 hours, pass After suction filtration and drying, a surface-modified ceramic material is obtained. Take 90 parts of the modified ceramic material and add it to the solvent, stir and disperse evenly, then add 10 parts of the first binder, stir and mix evenly to obtain a ceramic slurry. Apply the prepared ceramic slurry on one side of the base film by gravure roller coating, and obtain a ceramic coating after drying; take 92 parts of hot-melt polymer materials and 8 parts of the second binder, and add them to the solvent Mix and stir for 2 hours to obtain a hot-melt polymer slurry, and apply the hot-melt polymer slurry on the ceramic coating side. The porous ceramic material is alumina, the hot-melt polymer is p...

Embodiment 2

[0054] The main features of this embodiment are: 93 parts of porous ceramic material, 7 parts of the first binder, 95 parts of hot-melt polymer material, and 5 parts of the second binder. All the other are with specific embodiment 1.

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Abstract

The invention provides a diaphragm of a lithium battery and a preparation method thereof. The diaphragm of the lithium battery comprises a base diaphragm, a ceramic coating and a hot melted polymer coating. The ceramic coating and the hot melted polymer coating are located on the same side of the base diaphragm, and the ceramic coating comprises a ceramic particle material and a first adhesive; the hot melted polymer coating comprises hot melted polymer material particles and a second adhesive. The problem of thermal closing and thermal contraction of the diaphragm is solved.

Description

technical field [0001] The invention relates to the field of battery production, in particular to a lithium battery diaphragm with good thermal shutdown performance and high temperature resistance. Background technique [0002] Lithium-ion battery is a new chemical power system developed rapidly in recent years. Compared with traditional nickel-cadmium or nickel-hydrogen batteries, it has the advantages of high specific energy, long cycle life, no memory effect, and fast charging and discharging. It can be widely used in portable electronic products such as rechargeable batteries required for mobile phones, notebook computers, video recorders, etc., and can also be used as a power source for electric vehicles and hybrid vehicles. As an important part of the battery, the battery separator directly affects the capacity, cycle performance and safety of the battery. Therefore, a separator with excellent performance plays an important role in improving the overall performance of ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/434
CPCH01M50/409H01M50/403Y02E60/10
Inventor 肖陈英李文谨赵静
Owner XUCHENG FUJIAN SCI & TECH
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