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Preparation method of cathode slurry, positive plate and lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor flexibility of positive electrode materials, and achieve the effect of improving peel strength and high compaction density

Pending Publication Date: 2020-05-19
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for preparing positive electrode slurry, positive electrode sheet and lithium-ion battery, so as to solve the problem of poor flexibility in existing high-density positive electrode materials

Method used

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  • Preparation method of cathode slurry, positive plate and lithium ion battery
  • Preparation method of cathode slurry, positive plate and lithium ion battery

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preparation example Construction

[0016] As described in the background art, the existing high-density positive electrode material has the problem of poor flexibility. In order to solve the above technical problems, this application provides a method for preparing a positive electrode slurry. The preparation method includes: mixing a solvent, polyvinylidene fluoride, and a flexible conductive material to obtain a glue; combining the glue with the positive electrode active material and The conductive agent is mixed to obtain a positive electrode slurry, wherein the flexible conductive material includes but is not limited to one of the group consisting of polypyrrole doped with sodium dodecylbenzene sulfonate, acrylic acid-pyrrole copolymer, and aniline-pyrrole copolymer Or multiple.

[0017] In the method for preparing the positive electrode slurry, polyvinylidene fluoride and specific flexible conductive materials are added to the positive electrode active material and the conductive agent. Using the above-menti...

Embodiment 1

[0036] A preparation method of lithium ion battery cathode slurry (take lithium nickel cobalt manganate (8:1:1) as an example), including the following steps:

[0037] (1) Add a certain amount of solvent NMP into the stirring tank, and add the polyvinylidene fluoride and aniline-pyrrole copolymer to the stirring tank at 2:1, stir, disperse, and dissolve in the solvent to form a viscosity of 6800mpa·s and a glue liquid with a solid content of 7wt%.

[0038] (2) Add a certain amount of positive electrode active material (lithium nickel cobalt manganate, 8:1:1) and conductive agent (acetylene black) into the mixing tank, stir and disperse uniformly to obtain a lithium ion battery positive electrode slurry , Wherein, based on the solid content of the positive electrode slurry, the positive electrode slurry includes: 95wt% positive active material, 2wt% conductive agent, 1wt% aniline-pyrrole copolymer, 2wt% polyvinylidene fluoride, and the viscosity of the positive slurry is 9857mpa·s,...

Embodiment 2

[0040] The difference from Example 1 is that the flexible conductive material is polypyrrole doped with sodium dodecylbenzene sulfonate, the viscosity of the positive electrode slurry is 9320 mPa·s, and the solid content of the slurry is 63.1%.

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Abstract

The invention provides a preparation method of cathode slurry, a positive plate and a lithium ion battery. The preparation method comprises the following steps: mixing a solvent, polyvinylidene fluoride and a flexible conductive material to obtain a glue solution; and mixing the glue solution with a cathode active material and a conductive agent to obtain cathode slurry, the flexible conductive material being selected from one or more of sodium dodecylbenzene sulfonate doped polypyrrole, an acrylic acid-pyrrole copolymer and an aniline-pyrrole copolymer. According to the preparation method ofthe cathode slurry, polyvinylidene fluoride and a specific flexible conductive material are added on the basis of the cathode active material and the conductive agent. When the positive plate is prepared from the positive slurry, under the combined action of the two materials, the positive plate can obtain higher compaction density, and the peel strength, flexibility and processability of the positive plate can be greatly improved.

Description

Technical field [0001] The invention relates to the field of lithium ion battery preparation, and in particular to a method for preparing a positive electrode slurry, a positive electrode sheet and a lithium ion battery. Background technique [0002] At present, lithium-ion batteries are widely used in many areas of life, such as new energy vehicle power batteries, 3C digital electronic products, power tools, etc. Therefore, the market demand for lithium-ion batteries is increasing, and the quality of lithium-ion battery products is also required taller and taller. To make a high-quality lithium-ion battery, you must first ensure that a good positive and negative electrode slurry is made, which is the most critical process in the entire lithium-ion battery manufacturing process. As the energy density of the battery increases, its requirements for the compaction density of the positive electrode sheet are getting higher and higher. If the positive pole piece is under the conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M4/131H01M4/136H01M10/0525
CPCH01M4/131H01M4/136H01M4/362H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/62H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 何海平王美春叶文锦李海军蔡惠群
Owner YINLONG ENERGY CO LTD