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High-temperature-resistant adhesive for lithium ion battery and battery pole piece applying the adhesive

A high-temperature-resistant adhesive and battery pole piece technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor dispersion of water-based adhesives and affect the electrochemical performance of batteries, and achieve good adhesion , Improve the cycle performance at room temperature and shorten the time

Pending Publication Date: 2020-07-10
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

Poor dispersibility of water-based binders leads to active material deposition and affects the electrochemical performance of the battery

Method used

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  • High-temperature-resistant adhesive for lithium ion battery and battery pole piece applying the adhesive
  • High-temperature-resistant adhesive for lithium ion battery and battery pole piece applying the adhesive
  • High-temperature-resistant adhesive for lithium ion battery and battery pole piece applying the adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh PMDA 3.63g, ODA 2.64g, BAHPP 0.85g with a molar ratio of 10:8:2, add all ODA and BAHPP into 30ml DMF solvent, stir mechanically, wait until ODA and BAHPP are all dissolved in DMF, then bath in ice water Under the condition of, PMDA was added twice, each time adding 50% of the total mass of PMDA to obtain a polyamic acid solution with a solid content of 20%, and the polyamic acid solution was formulated into a glue solution with a solid content of 10%. Mix the positive electrode active material NCM811, conductive carbon black, and polyamic acid according to the mass parts of 80%, 10%, and 10%. Add NMP solvent to dissolve the mixture. The volume ratio of the polyamic acid solution to the solvent is 1.2:1. Stir for 20 minutes , The positive electrode slurry was prepared. The polyimide slurry containing functional groups -OH was coated on aluminum foil and dried at room temperature for 12 hours, and then subjected to heat treatment. The heat treatment process is to inc...

Embodiment 2

[0040] Weigh PMDA3.54g, ODA1.92g, BAHPP1.93g with a molar ratio of 10:6:4, add all ODA and BAHPP into 30ml DMF solvent, stir mechanically, wait until ODA and DABA are all dissolved in DMF, then bath in ice water Under the condition of, PMDA was added twice, each time adding 50% of the total mass of PMDA to obtain a polyamic acid solution with a solid content of 20%, and the polyamic acid solution was formulated into a glue solution with a solid content of 10%. Mix the positive electrode active material NCM811, conductive carbon black, and polyamic acid according to the mass parts of 80%, 10%, and 10%. Add NMP solvent to dissolve the mixture. The volume ratio of the polyamic acid solution to the solvent is 1.2:1. Stir for 20 minutes , The positive electrode slurry was prepared. The polyimide slurry containing the functional group -COOH was coated on aluminum foil and dried at room temperature for 12 hours, and then subjected to heat treatment. The heat treatment process was to i...

Embodiment 3

[0043] Weigh PMDA 3.45g, ODA 1.25g, BAHPP 2.42g with a molar ratio of 10:4:6, add all ODA and BAHPP into 30ml DMF solvent, stir mechanically, and after all PDA and DADHBP are dissolved in DMF, take an ice-water bath Under the condition of, PMDA was added twice, each time adding 50% of the total mass of PMDA to obtain a polyamic acid solution with a solid content of 20%, and the polyamic acid solution was formulated into a glue solution with a solid content of 10%. Mix the positive electrode active material NCM811, conductive carbon black, and polyamic acid according to the mass parts of 80%, 10%, and 10%. Add NMP solvent to dissolve the mixture. The volume ratio of the polyamic acid solution to the solvent is 1.2:1. Stir for 20 minutes , The positive electrode slurry was prepared. The polyimide slurry containing functional groups -OH was coated on aluminum foil and dried at room temperature for 12 hours, and then subjected to heat treatment. The heat treatment process is to inc...

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Abstract

The invention discloses a high-temperature-resistant adhesive for a lithium ion battery and a battery pole piece applying the adhesive. The preparation method comprises the following steps: adding diamine containing functional groups and dicarboxylic anhydride according to a certain ratio for solution polycondensation; preparing a polyimide precursor-polyamic acid solution with a certain concentration, uniformly mixing the polyimide precursor-polyamic acid solution with an active substance and a conductive agent, coating the surface of a current collector with the obtained mixture, and carrying out programmed heating heat treatment to make polyamic acid undergo a thermal imide cyclization reaction in order to form polyimide in order to prepare the lithium ion battery pole piece with polyimide as a binder. The polyimide adhesive containing the functional group prepared by the invention is excellent in high-temperature resistance; the polyimide adhesive is simple in preparation method and good in chemical stability, the bonding strength of the polyimide adhesive can be improved by regulating and controlling the variety and proportion of functional groups and increasing flexible chainsegments, it is guaranteed that a pole piece can be dried and dewatered at high temperature, the cycle performance and safety performance of a battery are improved, and the polyimide adhesive has wide application prospects in the field of high-temperature-resistant, high-safety and high-specific-energy lithium ion batteries.

Description

Technical field [0001] The invention relates to the technical field of electrode materials, in particular to a high-temperature resistant binder for lithium ion batteries and battery pole pieces using the binder. Background technique [0002] Lithium-ion batteries have been widely used in small electronic devices such as PCs, mobile phones, and AV equipment due to their environmental friendliness and long cycle life. In addition, lithium-ion batteries have begun to develop in the direction of large capacity and high specific energy, and their applications involve electric vehicles, drones, smart grids, aerospace and other fields, so the design of high energy density, high voltage, high safety lithium ion The battery has become a top priority. [0003] Lithium ion batteries are composed of positive electrodes, separators, electrolytes, and negative electrodes. The positive and negative electrodes are composed of powdered active materials (such as lithium metal oxides, carbon negati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/1391H01M10/0525C08G73/10
CPCH01M4/622H01M4/131H01M4/1391H01M10/0525C08G73/1071C08G73/1042Y02E60/10
Inventor 齐胜利王亚丽田国峰武德珍
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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