Lithium ion battery separator, processing method thereof and lithium ion battery

A technology of lithium-ion batteries and processing methods, applied in the field of lithium-ion battery diaphragms, can solve the problems of no flame retardant effect and high probability of battery fire, and achieve the effect of improving safety performance

Inactive Publication Date: 2018-09-18
HUNAN GRAND PRO ROBOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since alumina only has heat insulation effect and no further flame retardant effect, when a short circuit occurs inside the battery, alumina only delays further expansion, and the probability of battery fire is still relatively high

Method used

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  • Lithium ion battery separator, processing method thereof and lithium ion battery
  • Lithium ion battery separator, processing method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Immerse the diaphragm (model Cegard 23) in magnesium nitrate solution, the molar concentration of magnesium is 0.1mol / L, after the diaphragm is completely soaked, dry it at 100°C, and then add sodium hydroxide solution, the concentration is 0.5mol / L L, spray evenly on the surface of the diaphragm, put it on hold for 10 minutes, immerse in pure water to wash repeatedly, dry at 100°C, brush the surface of the diaphragm lightly with a brush to remove the magnesium hydroxide particles attached to the surface of the diaphragm, after treatment diaphragm. After testing, the thickness of magnesium hydroxide on the diaphragm is 0.3 microns.

Embodiment 2

[0025] Immerse the diaphragm (egard 23) in the magnesium salt magnesium nitrate solution, the molar concentration of magnesium is 2mol / L, after the diaphragm is completely soaked, dry it at 100°C, and then add the sodium hydroxide solution, the concentration is 0.5mol / L , evenly sprayed on the surface of the diaphragm, after standing for 10 minutes, soaked in pure water and washed repeatedly, dried at 100°C, lightly brushed the surface of the diaphragm with a brush, brushed off the magnesium hydroxide particles attached to the surface of the diaphragm, and obtained the treated diaphragm . After testing, the thickness of magnesium hydroxide on the diaphragm is 3 microns.

Embodiment 3

[0027] Immerse the diaphragm (egard 23) in the magnesium salt magnesium nitrate solution, the molar concentration of magnesium is 4mol / L, after the diaphragm is completely soaked, dry it at 100°C, and then add the sodium hydroxide solution, the concentration is 0.5mol / L , evenly sprayed on the surface of the diaphragm, after standing for 10 minutes, soaked in pure water and washed repeatedly, dried at 100°C, lightly brushed the surface of the diaphragm with a brush, brushed off the magnesium hydroxide particles attached to the surface of the diaphragm, and obtained the treated diaphragm . After testing, the thickness of magnesium hydroxide on the diaphragm is 15 microns.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a lithium ion battery separator, a processing method thereof and a lithium ion battery. According to the method, magnesium hydroxide is generated on the separator by reacting of a magnesium salt attached to the separator with an alkaline solution. The flame retardant magnesium hydroxide is used to replace alumina, so that the lithium ion battery separator has a flame retarding effect. When the lithium ion battery separator is heated, the magnesium hydroxide not only generates a heat insulation effect, but also absorbs heat. When short circuit occurs in a certain point inside the battery, antimony oxide can absorb the heat quickly to drop rapidly the temperature, so that the battery does not catch fire or explode. The safety performance of the battery manufactured from by the lithium ion battery separator processed by the method is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery separator, a processing method thereof and a lithium ion battery. Background technique [0002] In the ceramic diaphragm currently used in lithium-ion batteries, aluminum oxide is generally used for coating. Aluminum oxide has a heat insulation effect. Non-diffusion, the diaphragm does not shrink, and the resistance short-circuit point does not spread further, thereby preventing the battery from exploding. [0003] However, since alumina only has heat insulation effect and no further flame retardant effect, when a short circuit occurs inside the battery, alumina only delays further expansion, and the probability of battery fire is still relatively high. Therefore, a new treatment method for lithium-ion battery separators has been developed, so that the separators not only have a heat-insulating effect, but also have the function of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/613H01M10/653H01M10/654H01M10/658H01M50/403H01M50/449H01M50/489
CPCH01M10/0525H01M10/613H01M10/653H01M10/654H01M10/658H01M50/431H01M50/403H01M50/449Y02E60/10
Inventor 谢红波陈海初陈振兵
Owner HUNAN GRAND PRO ROBOT TECH
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