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Separator and lithium ion battery

A lithium-ion battery and separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem that the separator cannot meet the technical requirements of ultra-high-power discharge of lithium-ion batteries, and reduce the bonding effect and ensure Safety performance, effect of extending cycle life

Inactive Publication Date: 2018-03-23
SUNWODA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a diaphragm, which aims to solve the technical requirements that the existing diaphragm cannot meet the ultra-high power discharge required when the lithium-ion battery new energy vehicle starts and stops

Method used

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  • Separator and lithium ion battery
  • Separator and lithium ion battery
  • Separator and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0039] The preparation method flow process of diaphragm in the embodiment of the present invention is as follows:

[0040] S1: Select a diaphragm substrate with a specified thickness range.

[0041] For example, the base material of the separator is selected as polypropylene, polyethylene, polypropylene / polyethylene / polypropylene three-layer composite film, polyimide film, cellulose non-woven fabric separator, etc. as the separator base material. Its thickness is 7-25um, the porosity of the base film is 40-60%, and the air permeability is 100-300s / 100ml.

[0042] S2: After the specified ceramic powder slurry is stirred and dispersed in a solvent under certain process conditions, a ceramic powder mixed slurry is formed.

[0043] For example, aluminum nitride with a particle size ranging from 0.1um to 1um is dispersed in organic solvents such as ethanol and N-methylpyrrolidone (NMP), and the stirring vacuum is normal pressure; the stirring temperature is 25°C; the stirring spee...

Embodiment 1

[0060] Select polypropylene with a thickness of 16um as the diaphragm substrate, with a porosity of 50% and an air permeability of 200s / 100ml; AlN ceramic powder with a particle size range of 0.5um and N-methylpyrrolidone (NMP) are used in a mass ratio of 1:2. Pre-stir. Stirring vacuum is normal pressure; stirring temperature is 25°C; stirring speed: 25 revolutions per minute, 1000 revolutions per minute; stirring time is 60 minutes to obtain a premixed slurry. Add a polyvinylidene fluoride (PVDF) solution with a mass ratio of 20% to the above premixed slurry, and continue to stir in vacuum for 3 hours, stirring speed: 25 revolutions per minute, 2500 revolutions per minute, to obtain a ceramic coating Slurry, when the measured viscosity of the ceramic coating slurry is less than 500mPas., it can be discharged. Add the organic polymer polymethyl methacrylate to the ester solvent in a mass ratio of 10:90 into the stirring tank, stir at 25°C±5°C for 4h, stirring speed: revolutio...

Embodiment 2

[0066] The difference from Example 1 is that the coating surface of the organic coating on the diaphragm is different. In Example 2, the adhesive is applied to the film surface of the diaphragm substrate through a micro-gravure plate to form a multi-gap strip-like dispersed morphology, that is, one side of the diaphragm. A ceramic coating is applied and an organic coating is applied on the other side. The rest are the same as in Embodiment 1, and the lithium-ion battery 2 is assembled.

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Abstract

The invention discloses a separator and a lithium ion battery. The separator comprises a separator substrate and an organic coating, wherein the organic coating is formed by distributing a cohesive organic polymer on a single surface or double surfaces of the separator substrate in a form of space dispersed and coated strips with specified thickness. Uniformly distributed concave and convex interval zones are shown on the surface of the separator in a manner of multi-space dispersed and coated strip-shaped organic coatings, a certain buffer space is reserved between a positive pole and a negative pole, stress produced by positive and negative pole pieces because of swelling in the charge-discharge process is released, and the probability of distortion in the cycle process of the lithium ion battery is greatly reduced; the internal resistance of the battery is reduced while the better adhesion effect with the positive and negative poles is guaranteed; besides, a channel is provided forinfiltration and circulation of an electrolyte, and the cycle life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the field of new energy sources, in particular to diaphragms and lithium ion batteries. Background technique [0002] Countries all over the world are increasingly calling for improving environmental protection, and various electric vehicles stand out. However, because the energy density of batteries is hundreds of times lower than that of gasoline, it is far from the value required by electric vehicles. Experts estimate that electric vehicles will not be able to completely replace fuel-engine vehicles in the next 10 years. Battery technology has seriously hindered the popularization of electric vehicles. . [0003] Currently, those skilled in the art have developed a hybrid (Hybrid-Electric Vehicle, HEV for short) automobile. The so-called hybrid power unit is to combine the electric motor and the auxiliary power unit as the driving force on a car. The auxiliary power unit is actually a small fuel engine or a power generator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/18H01M10/0525H01M50/411H01M50/437H01M50/44H01M50/449H01M50/451H01M50/463H01M50/489H01M50/491
CPCH01M10/0525H01M50/40H01M50/463Y02E60/10
Inventor 程忠陈辉李国龙张耀
Owner SUNWODA ELECTRONICS
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