Lithium ion battery diaphragm, preparation method of lithium ion battery diaphragm and lithium ion battery

A technology for lithium ion batteries and separators, used in secondary batteries, battery pack components, separators/films/diaphragms/spacers, etc.

Active Publication Date: 2014-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the separator prepared by this method to satisfy the functions of both excellent electrolyte absorption performance and internal short circuit prevention.

Method used

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  • Lithium ion battery diaphragm, preparation method of lithium ion battery diaphragm and lithium ion battery
  • Lithium ion battery diaphragm, preparation method of lithium ion battery diaphragm and lithium ion battery
  • Lithium ion battery diaphragm, preparation method of lithium ion battery diaphragm and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Example 1 Preparation of three-layer composite lithium-ion battery separator

[0082] Step a: mixing the raw materials of the support layer and the dense layer with water, beating, and diluting to 0.05wt% to obtain the support layer slurry and the dense layer slurry;

[0083] Step b: the diluted support layer slurry and the dense layer slurry are independently loaded into the inclined wire paper machine (such as figure 1 shown), wherein the support layer slurry is transported to flow channel 1, and the dense layer slurry is transported to flow channel 2, so that the support layer slurry and the dense layer slurry are stacked in the same area successively, and are formed by one-time copying to obtain the support layer and the dense layer. Floor;

[0084] Step c: uniformly disperse the inorganic particles in the binding resin to obtain a coating liquid, uniformly coat the coating liquid on the surface of the dense layer, and dry to obtain a lithium-ion battery separato...

Embodiment 2

[0086] Example 2 Preparation of three-layer composite lithium-ion battery separator

[0087] The preparation method of this example is basically the same as that of Example 1, except that in step a, the raw materials of the support layer and the dense layer are mixed with water, beaten, and diluted to 0.01 wt%.

Embodiment 3

[0088] Example 3 Preparation of three-layer composite lithium-ion battery separator

[0089] The preparation method of this example is basically the same as that of Example 1, except that in step a, the raw materials of the support layer and the dense layer are mixed with water, beaten, and diluted to 0.01 wt%.

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Abstract

The invention provides a lithium ion battery diaphragm, a preparation method of the lithium ion battery diaphragm and a lithium ion battery. The lithium ion battery diaphragm comprises a support layer, wherein either or both of a dense layer or an inorganic coating are compounded on the support layer; the average quantity of the lithium ion battery diaphragm is 8-25g / m<2>, the thickness is 15-60 mu m, the average aperture is 50-500nm, and the porosity is 78-82%. The lithium ion battery diaphragm provided by the invention is good in isolating property and excellent in electrolyte absorbing property, is further relatively high in tension strength, is capable of realizing high power capacity of a battery, and can meet the requirement of rapid large-current charge and discharge of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-ion battery diaphragm, a preparation method thereof and a lithium-ion battery using the diaphragm. Background technique [0002] The battery diaphragm refers to the diaphragm material between the positive electrode and the negative electrode of the battery. It is a key component of the battery. Pass freely between the negative poles. The performance of the battery separator determines the interface structure of the battery and the internal resistance of the battery, which in turn affects the capacity, cycle performance and charge-discharge current density of the battery. [0003] The separator that separates the positive and negative active materials in lithium-ion batteries needs to have the following properties: [0004] (1) It can prevent the internal short circuit caused by the contact between the positive electrode and the negative electrode active ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/44H01M50/449H01M50/463Y02E60/10
Inventor 王习文王印奎郝静怡张洪峰
Owner SOUTH CHINA UNIV OF TECH
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