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High-temperature-resistant, high-voltage-resistant and high-load adhesive for lithium ion battery and battery positive pole piece applying same

A lithium-ion battery, high-temperature-resistant technology, applied to battery electrodes, positive electrodes, adhesives, etc., can solve the problems of battery thermal runaway, fire and explosion, etc., and achieve high temperature resistance, high load, and excellent bonding performance.

Pending Publication Date: 2021-08-06
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of overcharging, a series of reactions will occur inside the battery, and the electrolyte and other materials will generate gas, further generating heat, causing the thermal runaway of the battery, and even causing fire and explosion in severe cases.

Method used

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  • High-temperature-resistant, high-voltage-resistant and high-load adhesive for lithium ion battery and battery positive pole piece applying same
  • High-temperature-resistant, high-voltage-resistant and high-load adhesive for lithium ion battery and battery positive pole piece applying same
  • High-temperature-resistant, high-voltage-resistant and high-load adhesive for lithium ion battery and battery positive pole piece applying same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Weigh 1.96g of ODPA and 3.29g of BPADA with a molar ratio of 1:1, mix them evenly, place them in a feeding bottle and seal them for later use. Weigh 2.51g of ODA and dissolve it in 30mL of NMP solvent, stir it until it is completely dissolved, add the mixed ODPA and BPADA monomers in 6 batches under ice-water bath conditions, and obtain a polyamic acid gum with a solid content of 20wt%. solution, the polyamic acid glue solution was diluted to a solution with a solid content of 5 wt%. Mix positive electrode active material NCM811, conductive carbon black, and polyamic acid solution with a solid content of 5wt% (calculated according to its solute) according to a mass ratio of 94:3:3, add 1.01g of NMP solvent to adjust its viscosity, and stir for 2 hours. Obtain positive electrode slurry. Coat 10.68g of flexible polyimide slurry on an aluminum foil (10cm×12cm) and place it in an ultra-clean table to dry at room temperature for 12h, cut into a disc with a diameter of 14mm,...

Embodiment 2

[0059] Weigh 2.22g of BPDA and 3.93g of BPADA with a molar ratio of 1:1, mix them evenly, place them in a feeding bottle and seal them for later use. Weigh 1.62g of PDA and dissolve it in 30mL of NMP solvent, stir it until it is completely dissolved, add the mixed BPDA and BPADA monomers in 6 batches under ice-water bath conditions, and obtain a polyamic acid gum with a solid content of 20wt%. solution, the polyamic acid glue solution was diluted to a solution with a solid content of 5 wt%. Mix positive electrode active material NCM811, conductive carbon black, and polyamic acid solution with a solid content of 5wt% (calculated according to its solute) according to a mass ratio of 94:3:3, add 1.01g of NMP solvent to adjust its viscosity, and stir for 2 hours. Obtain positive electrode slurry. Coat 10.68g of rigid polyimide slurry on an aluminum foil (10cm×12cm) and place it in an ultra-clean table to dry at room temperature for 12h, cut into a disc with a diameter of 14mm, ro...

Embodiment 3

[0063] Weigh 0.35g of ODPA and 5.21g of BPADA with a molar ratio of 1:9, mix them evenly, place them in a feeding bottle and seal them for later use. Weigh 2.21g of ODA and dissolve it in 30mL of NMP solvent, stir it until it is completely dissolved, add the mixed ODPA and BPADA monomers in 6 batches under ice-water bath conditions, and obtain a polyamic acid gum with a solid content of 20wt%. solution, the polyamic acid glue solution was diluted to a solution with a solid content of 5 wt%. Mix positive electrode active material NCM811, conductive carbon black, and polyamic acid solution with a solid content of 5wt% (calculated according to its solute) according to a mass ratio of 94:3:3, add 1.01g of NMP solvent to adjust its viscosity, and stir for 2 hours. Obtain positive electrode slurry. Coat 10.68g of flexible polyimide slurry on an aluminum foil (10cm×12cm) and place it in an ultra-clean table to dry at room temperature for 12h, cut into a disc with a diameter of 14mm,...

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Abstract

The invention provides a high-temperature-resistant, high-voltage-resistant and high-load adhesive for a lithium ion battery and a battery positive pole piece applying the same, and belongs to the technical field of preparation methods of electrode materials. The rigidity and flexibility of the molecular chain of the polyimide adhesive are regulated and controlled by controlling the number of ether bonds in the molecular chain, so that the high-temperature-resistant, high-voltage-resistant and high-load adhesive for the lithium ion battery is provided. According to the adhesive, diamine and dicarboxylic anhydride which contain different numbers of ether bonds are subjected to polycondensation to form a polyamide acid glue solution, and the polyamide acid glue solution is subjected to thermal imidization treatment to obtain the polyimide adhesive. The adhesive disclosed by the invention is excellent in high-temperature resistance, high-voltage resistance and adhesive performance, compared with a traditional adhesive positive pole piece, the lithium ion battery positive pole piece applying the adhesive can load more active substances, the specific discharge capacity of a lithium ion battery is improved, the high-temperature resistance and high-voltage resistance of the pole piece are also obviously improved, and the cycle performance and the service life of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation methods, in particular to a high-temperature-resistant, high-voltage-resistant, high-load adhesive for a lithium ion battery and a battery positive pole piece using the adhesive. Background technique [0002] With the output of a large number of renewable resources, the issue of energy storage is particularly important. As one of the important energy storage devices, lithium-ion batteries are widely used in intelligent portable electronic devices, hybrid vehicles, aerospace, military industry and other fields due to their small size, easy portability, high energy density, and high specific capacity. In the future, as the requirements for energy storage devices further increase, lithium-ion batteries will also develop in the direction of low cost, high energy density, and high safety performance. [0003] Lithium-ion batteries are generally composed of positive electrodes, s...

Claims

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Application Information

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IPC IPC(8): C09J179/08C08G73/10H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCC09J179/08C08G73/1071C08G73/1007H01M4/622H01M4/131H01M4/1391H01M10/0525H01M2004/028Y02E60/10
Inventor 齐胜利齐可心王亚丽董南希田国峰武德珍
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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