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Insulating material used for electrode surface of lithium battery and preparation method of insulating material

An electrode surface, lithium battery technology, applied in insulators, inorganic insulators, circuits, etc., can solve problems such as thermal runaway, achieve the effect of enhancing stability, avoiding battery fire or even explosion accidents, and improving safety

Active Publication Date: 2012-01-11
SHUANGDENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of thermal runaway in existing lithium batteries, and provide an insulating material for lithium battery electrode surfaces with good high temperature resistance and improved battery safety and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Weigh 800gAl 2 o 3 , 100g gas phase S i o 2 and 100g PVDF were put into the batching vessel respectively, put them into a vacuum drying oven uniformly, baked at 100°C for 20h, and took it out when the oven temperature dropped to 50°C after the end. Al first 2 o 3 and half the weight of gaseous S i o 2 Put it into a ball mill and grind for 4 hours, the ratio of material to ball is 1:1, and then add the remaining gas phase S i o 2 , Continue grinding for 4h to obtain the mixture. While grinding, add 500-700g of NMP solvent into a 5L vacuum mixer, then add the baked PVDF into it, stir at a speed of 30Hz for 8h, and make a binder slurry. Then add the ground mixture into the binder slurry, stir at 20 Hz for 8 hours, keep gauge pressure -0.08MPa vacuum for 30 minutes for defoaming after stirring, and finally prepare the insulating material.

[0013] The influence of the thickness of the coating layer on the performance of the battery, the actual test data is as foll...

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PUM

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Abstract

The invention provides a preparation method of insulating material used for electrode surface of a lithium battery. The material comprises the following components in percentage by weight: 75%-96% of Al2O3, 0.5%-15% of gas phase SiO2 and 2.5-15% of bonding agent. The preparation method comprises the following steps of: baking each ingredient firstly; then grinding Al2O3 and SiO2 to prepare a mixed material; adding the bonding agent into a solvent and stirring to obtain bonding agent slurry; and then mixing the mixed material and the bonding agent slurry and stirring uniformly, and carrying out defoaming treatment in vacuum to finally obtain the insulating material. The material is used for coating the electrode surface of the lithium battery to form a metal oxide insulating film; even though a battery diaphragm is damaged under the condition of high temperature, short circuit between a positive electrode and a negative electrode also can be prevented, accidents are avoided, and the safety of a power high-capacity lithium battery is improved greatly.

Description

technical field [0001] The invention relates to the manufacture of a lithium ion battery, in particular to an insulating material used on the electrode surface of a power large-capacity lithium ion battery and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries used in electric vehicles, electric motorcycles and electric bicycles are under high-temperature environments or under abuse (such as: overcharge / overdischarge) conditions, because the separator between the positive and negative electrodes inside the battery is made of polyethylene / Made of polypropylene material, its ability to withstand temperature is poor, it starts to shrink at about 80°C, and starts to melt at 135-165°C, so it will cause a short circuit between the positive and negative electrodes inside the battery, resulting in thermal runaway of the battery situation. Contents of the invention [0003] The purpose of the present invention is to overcome the defect o...

Claims

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Application Information

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IPC IPC(8): H01B3/00H01B3/10H01B19/00
Inventor 袁春刚
Owner SHUANGDENG GRP
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