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High-temperature-resistant binder for lithium battery ceramic diaphragm and preparation method of high-temperature-resistant binder

A technology of ceramic binder and ceramic diaphragm, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of unfavorable lithium battery cycle life, easy powder drop, and increased internal resistance of the diaphragm, so as to avoid Effects of abnormal thermal runaway, good thermal stability, and low thermal shrinkage

Active Publication Date: 2021-11-02
ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are mainly the following problems in the adhesives used as ceramic diaphragms on the market: (1) the bonding strength is low, and the ceramic coating film prepared under the situation of less dosage is easy to fall off in the process of production, transportation and use. powder, in the case of a large amount of use, it will cause an increase in the internal resistance of the diaphragm, which is not conducive to the cycle life of the lithium battery; (2) the preparation process is complicated, the production cost is high, and the solid content is low. energy for drying

Method used

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  • High-temperature-resistant binder for lithium battery ceramic diaphragm and preparation method of high-temperature-resistant binder
  • High-temperature-resistant binder for lithium battery ceramic diaphragm and preparation method of high-temperature-resistant binder
  • High-temperature-resistant binder for lithium battery ceramic diaphragm and preparation method of high-temperature-resistant binder

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add 1g of sodium lauryl sulfate into 300mL of water and raise the temperature to 40°C, add 0.5g of ammonium persulfate dropwise, and start adding 100g of ethyl acrylate and 0.2g of dicumyl peroxide dropwise after 30 minutes, and finish the dropwise addition within about 3 hours After 3 hours of heat preservation, a polymer with a network structure was obtained; the temperature was lowered to 50°C, and 50g of vinyl acetate and 0.5g of polypropylene glycol were added dropwise within about 2 hours. After slowly heating up to 85°C, 0.5g of potassium persulfate was added dropwise, Adding time is 2 hours. After adding, continue to keep warm for 5 hours to form a linear acrylic resin polymer. Cool down to below 40°C to obtain a latex-type interpenetrating network acrylic polymer resin.

Embodiment 2

[0026] Add 1.5g of sodium dodecylbenzenesulfonate into 500mL of water and raise the temperature to 40°C, add 1g of sodium persulfate dropwise, and after 30min, start to add 250g of isooctyl acrylate and 1g of dicumyl hydrogen peroxide dropwise, within about 3 hours After the dropwise addition, keep warm for 3 hours to obtain a polymer with a network structure; cool down to 40°C, add 100g of methyl acrylate and 1g of dicumyl peroxide dropwise within about 2 hours, and start to drop 0.3 g ammonium persulfate, the time for dropping is 2 hours, after the addition, continue to keep warm for 5 hours to form a linear acrylic resin polymer, and cool down to below 40°C to obtain a latex-type interpenetrating network acrylic polymer resin.

Embodiment 3

[0028] Add 2g of sodium dodecylsulfonate into 600mL of water and raise the temperature to 45°C, add 1.5g of sodium persulfate dropwise, and after 30 minutes, start to add 200g of butyl acrylate and 0.5g of dicumyl hydrogen peroxide dropwise, and add dropwise for about 3 hours After 3 hours of heat preservation, a polymer with a network structure is obtained; the temperature is lowered to 50°C, and 100g of acrylamide and 1g of dicumyl peroxide are added dropwise within about 2 hours, and after the temperature is slowly raised to 85°C, 0.3g of persulfuric acid is added dropwise Potassium is added dropwise for 2 hours. After the addition, the temperature is continued for 5 hours to generate a linear acrylic resin polymer, and the temperature is lowered to below 40°C to obtain a latex-type interpenetrating network acrylic polymer resin.

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a high-temperature-resistant water-based ceramic binder for a lithium battery diaphragm, a preparation method of the high-temperature-resistant water-based ceramic binder and a lithium battery diaphragm containing the high-temperature-resistant water-based ceramic binder. The binder is latex type acrylic polymer resin with an interpenetrating network structure, the glass transition temperature of the binder polymer is greater than 160 DEG C, and the ratio of the thermal shrinkage rate of the lithium battery diaphragm prepared from the high-temperature-resistant binder at the temperature of 150 DEG C to the thermal shrinkage value measured at the temperature of 120 DEG C is less than 2, so that the thermal shrinkage rate of the diaphragm is slightly changed along with the abrupt rise of temperature, and the requirement of manufacturing the high-safety ceramic diaphragm is met. In addition, the binder is a water-based binder, does not contain an organic solvent, and is safe and environment-friendly.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-temperature-resistant water-based ceramic binder for a lithium battery separator, a preparation method thereof, and a lithium battery separator containing the ceramic binder. Background technique [0002] In order to prevent short circuits between positive and negative electrodes, currently, lithium-ion batteries and lithium-ion polymer batteries use polyolefin-based separators. However, since polyolefin-based separators have a melting point of 200°C or lower, they shrink or melt when the temperature of the battery increases due to internal or external factors, resulting in a volume change so that the battery is positively caused by the shrinkage or melting of the separator. The possibility of a short circuit between the negative electrodes is high, which can easily lead to accidents, such as battery explosion caused by discharge. Therefore, it is necessary to provide...

Claims

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Application Information

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IPC IPC(8): C09D133/12C09D133/26C09D7/61C08F120/18C08F118/08C08F120/14C08F120/56H01M50/434H01M10/0525
CPCC09D133/12C09D133/26C09D7/61C08F120/18C08F118/08C08F120/14C08F120/56H01M50/417H01M10/0525C08L2205/04C08K2003/2227C08L33/08C08K3/22Y02E60/10
Inventor 庄志王中奇陈永乐廖晨博孙敏强胡君单华靖冶成良程跃
Owner ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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