Voltage-resistant electrolyte-resistant termination adhesive tape and copolymer for termination adhesive tape

A copolymer and voltage-resistant technology, which is applied in the direction of ester copolymer adhesives, amide/imide polymer adhesives, circuits, etc., can solve the problems of whitening, swelling, electrolyte pollution, diving, etc., and achieve excellent Voltage resistance and electrolyte resistance performance, the effect of improving the voltage resistance performance and reducing the dielectric constant

Active Publication Date: 2022-02-18
佛山市顺德区永创翔亿电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional termination tape can no longer meet the safety performance requirements of high-energy density and high-voltage lithium-ion batteries (voltage greater than 4.2V), and it is prone to oxidative decomposition of the termination tape, whitening and swelling, discoloration and yellowing, polluting the electrolyte, and triggering lithium-ion battery charging and discharging. The voltage "diving" phenomenon, the appearance of the battery is bulging, which seriously affects the safety performance of lithium-ion batteries

Method used

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  • Voltage-resistant electrolyte-resistant termination adhesive tape and copolymer for termination adhesive tape
  • Voltage-resistant electrolyte-resistant termination adhesive tape and copolymer for termination adhesive tape
  • Voltage-resistant electrolyte-resistant termination adhesive tape and copolymer for termination adhesive tape

Examples

Experimental program
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Effect test

Embodiment 1

[0045] In this embodiment, a voltage-resistant and electrolyte-resistant adhesive and a voltage-resistant and electrolyte-resistant termination tape are prepared. The specific process is as follows:

[0046](1) Mix 10 parts of stearyl acrylate, 60 parts of 2-ethylhexyl acrylate, 6 parts of 4-hydroxybutyl acrylate, 3 parts of N,N-dimethylacrylamide, 0.2 parts of After mixing nitrogen bisisobutyronitrile, 0.4 parts of dibenzoyl peroxide, 100 parts of tetrahydrofuran and 100 parts of ethyl acetate, the temperature was controlled at 80 ° C, and the radical polymerization reaction was carried out under the protection of nitrogen for 6 hours to obtain poly(acrylic acid Octadecyl-random-acrylate-2-ethylhexyl-random-4-hydroxybutyl acrylate-random-N,N-dimethylacrylamide); add 4 parts of isocyanic acid 1 -Adamantyl ester (CAS No.: 4411-25-0), carry out a chemical reaction for 2h to obtain poly(octadecyl acrylate-random-2-ethylhexyl acrylate-random-4-hydroxybutyl acrylate - random-acryl...

Embodiment 2

[0050] In this embodiment, a voltage-resistant and electrolyte-resistant adhesive and a voltage-resistant and electrolyte-resistant termination tape are prepared. The specific process is as follows:

[0051] (1) 20 parts of stearyl acrylate, 50 parts of 2-ethylhexyl acrylate, 15 parts of 4-hydroxybutyl acrylate, 5 parts of N,N-dimethylacrylamide, 0.3 parts of After mixing azobisisobutyronitrile, 0.2 parts of tert-butyl peroxyneodecanoate, 80 parts of tetrahydrofuran and 70 parts of butyl acetate, the temperature was controlled at 85° C., and the radical polymerization reaction was carried out under nitrogen protection for 8 hours. Obtain poly(stearyl acrylate-random-acrylic acid-2-ethylhexyl ester-random-4-hydroxybutyl acrylate-random-N,N-dimethylacrylamide), then add 12 parts of 1-adamantyl isocyanate, carry out chemical reaction for 3h, obtain poly(octadecyl acrylate-random-acrylic acid-2-ethylhexyl ester-random-4-hydroxybutyl acrylate-random-acrylic acid 4 -((adamantan-1-y...

Embodiment 3

[0055] In this embodiment, a voltage-resistant and electrolyte-resistant adhesive and a voltage-resistant and electrolyte-resistant termination tape are prepared. The specific process is as follows:

[0056] (1) 30 parts of octadecyl acrylate, 40 parts of 2-ethylhexyl acrylate, 20 parts of 4-hydroxybutyl acrylate, 7 parts of N,N-dimethylacrylamide, 0.2 parts After mixing azobisisobutyronitrile, 0.2 parts of tert-butyl peroxyneodecanoate, 170 parts of ethyl acetate and 30 parts of toluene, the temperature was controlled at 87 ° C, and the radical polymerization reaction was carried out under the protection of nitrogen for 10 h. Obtain poly(stearyl acrylate-random-acrylic acid-2-ethylhexyl ester-random-4-hydroxybutyl acrylate-random-N,N-dimethylacrylamide), then add 18 parts of 1-adamantyl isocyanate, carry out chemical reaction for 4h, obtain poly(octadecyl acrylate-random-acrylic acid-2-ethylhexyl ester-random-4-hydroxybutyl acrylate-random-acrylic acid 4 -((adamantan-1-ylcar...

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Abstract

The invention discloses a voltage-resistant electrolyte-resistant termination adhesive tape and a copolymer used for the termination adhesive tape. The structure of the copolymer is poly(octadecylacrylate / random 2-ethylhexyl acrylate / random 4-hydroxybutyl acrylate / random 4-((adamantan-1-ylcarbamoyl)oxy)butyl acrylate / random-N,N-dimethylacrylamide). According to the invention, 4-((adamantan-1-ylcarbamoyl)oxy)butyl acrylate is introduced into a side chain of a polyacrylate colloid, so the polarity of a polyacrylate molecular chain is effectively reduced, a free volume is increased, charge movement among molecules is reduced, and voltage resistance is improved; the copolymer is cross-linked with a hydroxyl-containing elastomer and a polyfunctional isocyanate curing agent to form an interpenetrating-polymer-network three-dimensional cross-linked structure, so an obtained adhesive maintains the same good adhesive force as a polyacrylate system and also shows excellent voltage resistance and electrolyte resistance; and the termination adhesive tape prepared from the adhesive can be suitable for high-energy-density lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium battery termination tapes, and in particular relates to a voltage-resistant and electrolyte-resistant termination tape and a copolymer used for the termination tape. Background technique [0002] In recent years, lithium-ion batteries have been widely used in portable electronic products, and fast charging technology has become a mainstream market demand. At present, the main development technology direction of lithium batteries is to develop high-performance requirements such as high energy density, high safety and long service life. In order to meet the development of lithium battery technology, high specific energy cathode materials, high specific capacity negative electrodes, and high voltage resistant electrolytes have become research hotspots. [0003] In the assembly and production process of lithium-ion batteries, special termination tapes are generally used to fix, insulate and protect t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/20C08F220/54C08F8/30C09J7/25C09J7/30C09J133/08C09J11/06C09J11/08H01M10/0525
CPCC08F220/1808C08F8/30C09J7/255C09J7/30C09J133/24C09J11/06C09J11/08H01M10/0525C09J2203/33C09J2467/006C08L2205/04C09J2301/122C08F220/1818C08F220/20C08F220/54C08L15/00C08K5/29Y02E60/10
Inventor 叶志斌李俊刘锋周宗增曾丽娟
Owner 佛山市顺德区永创翔亿电子材料有限公司
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