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Lithium battery separator coating and preparation method thereof

A lithium battery separator and coating technology, applied in the field of lithium battery separator coating and its preparation, can solve the problem of high ionic conductivity, and achieve the effects of enhancing bonding effect, ensuring conductivity and improving mechanical strength

Inactive Publication Date: 2019-08-20
深圳市宝聚合新材料技术应用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, just coating the separator with ceramics cannot meet the higher requirements for the separator in the battery industry today: for example, ① the bond strength between the separator and the positive and negative electrodes is high, and the interface compatibility is good; ② the coating has excellent electrochemical properties. , high ionic conductivity

Method used

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  • Lithium battery separator coating and preparation method thereof
  • Lithium battery separator coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method for a lithium battery diaphragm coating, comprising the steps of:

[0042] Step 1. Add 23kg of aramid fiber, 8kg of shell powder, 15kg of silicone microspheres, 15kg of methacrylic acid, and 15kg of N-methylpyrrolidone into the mixer, and start the mixer to mix at a speed of 50rpm to obtain a premix;

[0043] Step 2: Add 4kg of boehmite, 3kg of lithium iodide, 12kg of vinylidene fluoride-hexafluoropropylene copolymer and 6kg of calcium titanate into the mixer of step 1 to carry out with the premix, and the mixing speed is 80rpm , to obtain an intermediate mixture;

[0044] Step 3: Mix 8 kg of higher fatty acid sodium with the intermediate mixture at a mixing speed of 200 rpm, and then directly apply it to the ceramic coating on the outside of the battery diaphragm;

[0045] Step 4. Put the battery separator in step 3 in a drying oven, and use an inert gas, especially argon gas for drying, and obtain a battery separator coating after being cured.

...

Embodiment 2

[0049] A preparation method for a lithium battery diaphragm coating, comprising the steps of:

[0050] Step 1. Add 31kg of aramid fiber, 12kg of shell powder, 19kg of silicone microspheres, 17kg of methacrylic acid, and 15kg of N-methylpyrrolidone into the mixer for mixing, and start the mixer to mix at a speed of 50rpm to obtain a premixed thing;

[0051] Step 2: Add 6kg boehmite, 5kg lithium iodide, 16kg vinylidene fluoride-hexafluoropropylene copolymer and 12kg ferric titanate into the mixer of step 1 and mix with the premix. The mixing speed is 80rpm, obtain intermediate mixture;

[0052] Step 3, mix 12kg of higher fatty acid sodium with the intermediate mixture, the mixing speed is 200rpm, and then directly apply it on the ceramic coating outside the battery diaphragm;

[0053] Step 4. Put the battery separator in step 3 in a drying oven for drying. The dry gas is inert gas, especially argon gas. After curing, the battery separator coating is obtained.

[0054] Among t...

Embodiment 3

[0057] A preparation method for a lithium battery diaphragm coating, comprising the steps of:

[0058] Step 1. Add 27kg of aramid fiber, 10kg of shell powder, 17kg of silicone microspheres, 16kg of methacrylic acid, and 17kg of N-methylpyrrolidone into the mixer for mixing, and start the mixer to mix at a speed of 50rpm to obtain a premixed thing;

[0059] Step 2. Add 5kg boehmite, 4kg lithium iodide, 14kg vinylidene fluoride-hexafluoropropylene copolymer and 9kg lithium metatitanate to the mixer in step 1 and mix with the premix. Be 80rpm, obtain intermediate mixture;

[0060] Step 3: Mix 10 kg of higher fatty acid sodium with the intermediate mixture at a mixing speed of 200 rpm, and then directly apply it to the ceramic coating outside the battery diaphragm;

[0061] Step 4. Put the battery separator in step 3 in a drying oven for drying. The dry gas is inert gas, especially argon gas. After curing, the battery separator coating is obtained.

[0062] Among them, the prep...

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Abstract

The invention discloses a lithium battery separator coating, relating to the field of lithium batteries. The lithium battery separator coating comprises, by weight, 23 to 31 parts of aramid, 15 to 19parts of silicone microspheres, 8 to 12 parts of shell powder, 4 to 6 parts of boehmite, 3 to 5 parts of iodized salt, 12 to 16 parts of fluorinated polymers, 15 to 17 parts of methacrylic acid, 6 to12 parts of titanate, 15 to 19 parts of N-methylpyrrolidone, and 8 to 12 parts of fatty acid salts. The coating prepared by the above formula has strong adhesive properties, a battery separator and positive and negative electrode sheets are bonded well, at the same time, the electrical conductivity is high, and so the coating is suitable for most lithium batteries. Moreover, the preparation methodis simple and is suitable for large-scale popularization and use.

Description

technical field [0001] The invention relates to the field of lithium batteries, more specifically, it relates to a lithium battery diaphragm coating and a preparation method thereof. Background technique [0002] With the blowout development of electric vehicles in recent years, the market size of power batteries is also rising sharply, but at the same time, the safety of power batteries has also become the focus of attention. According to incomplete statistics, in the first half of 2016 alone, a total of 11 fire accidents occurred in electric vehicles, one of which was caused by a short circuit of the battery. In order to eliminate the potential safety hazards of power batteries, it has become a consensus in the industry to improve the safety performance of power batteries. [0003] As one of the four major materials of lithium batteries, the separator is generally made of polyolefin-based porous film. During the charging and discharging process of lithium ions, the separa...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 熊明
Owner 深圳市宝聚合新材料技术应用有限公司
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