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Preparation method of positive and negative conductive liquid storage layer slurry and thick electrode

A negative electrode conduction and liquid storage layer technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of electrode kinetics deterioration and achieve good kinetic performance, battery DC internal resistance and high rate capacity keep improving effect

Inactive Publication Date: 2020-04-10
江苏智泰新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention expects to provide a positive and negative electrode conductive liquid storage layer slurry and a preparation method for a thick electrode, by introducing a conductive liquid storage layer, to solve the problem of poor kinetics caused by the thickening of the existing electrodes

Method used

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  • Preparation method of positive and negative conductive liquid storage layer slurry and thick electrode
  • Preparation method of positive and negative conductive liquid storage layer slurry and thick electrode
  • Preparation method of positive and negative conductive liquid storage layer slurry and thick electrode

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preparation example Construction

[0053] The specific embodiment of the present invention also provides a method for preparing a thick electrode, using the above-mentioned positive electrode conductive liquid storage layer slurry, the specific method includes:

[0054] (a) Weigh 0.2-0.5 parts of polyvinylpyrrolidone and 0.8-1.2 parts of polyvinylidene fluoride, add them to 233-400 parts of N-methylpyrrolidone that has been weighed, and stir to make Glue;

[0055] (b) Weigh 50-60 parts of zero-dimensional conductive agent, 20-30 parts of one-dimensional conductive agent, and 10-20 parts of two-dimensional conductive agent, add them to the above glue, and disperse and stir at a high speed to prepare Form positive electrode conductive liquid storage layer slurry.

[0056] (c) Coat the positive electrode slurry on the current collector 3, spray the above-mentioned positive electrode conductive liquid storage layer slurry after drying, apply a layer of positive electrode slurry after drying, and obtain the active ...

Embodiment 1

[0067] 1. Preparation of conductive liquid reservoir material

[0068] 1.1 Preparation of positive electrode conductive liquid storage layer slurry

[0069] (a) Weigh 0.2 parts of polyvinylpyrrolidone and 1.2 parts of polyvinylidene fluoride, add them to 300 parts of N-methylpyrrolidone that have been weighed, stir for 3 hours, and make a glue;

[0070] (b) Weigh 55 parts of conductive carbon black, 30 parts of carbon nanotubes, and 13.6 parts of graphene, and add them to the above glue, disperse and stir at high speed (>1300 rpm) for 2 hours, and make a solid 25% conductive reservoir slurry.

[0071] 1.2 Preparation of negative electrode conductive liquid storage layer slurry

[0072] (a) Weigh 0.6 parts of sodium hydroxymethyl cellulose, add it to 300 parts of deionized water that has been weighed, stir for 3 hours, and make a glue;

[0073] (b) Weigh 60 parts of conductive carbon black, 25 parts of carbon nanotubes, and 13.3 parts of graphene, and add them to the above g...

Embodiment 2

[0081] The preparation of positive and negative electrode conductive liquid storage layer materials is the same as in Example 1, and the company’s existing ternary positive electrode formula (same as in Example 1) is made into slurry and coated on aluminum foil, with an areal density of 300g / m 2 After drying, spray a positive electrode conductive liquid storage layer with a thickness of 5 μm, and then apply a layer with a density of 300g / m after drying 2 After drying, the positive electrode slurry was cold-pressed and stripped to obtain a positive electrode sheet with a sandwich structure of active layer 1-conductive liquid storage layer 2-active layer 1.

[0082] The company's existing water-based negative electrode formulation (same as Example 1) was made into a slurry and coated on copper foil with an areal density of 142g / m 2 After drying, spray a negative electrode conductive liquid storage layer with a thickness of 5 μm, and then apply a layer with a density of 142g / m af...

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Abstract

The invention discloses a preparation method of positive and negative conductive liquid storage layer slurry and a thick electrode. Positive / negative electrode conductive liquid storage layer slurry is prepared, a current collector (3) is coated with the positive / negative electrode slurry, the positive / negative electrode conductive liquid storage layer slurry is sprayed after drying, a layer of positive / negative electrode slurry is coated after drying, and the positive / negative electrode pole piece of the sandwich structure of the active layer (1), a conductive liquid storage layer (2) and theactive layer (1) is obtained through cold pressing and slitting after drying. Through the introduction of the conductive liquid storage layer, the problem of poor dynamics caused by the thickening ofthe existing electrode is solved, the direct-current internal resistance and the high-rate capacity are greatly improved when the same coating surface density is achieved, and the dynamics performance is better; when the surface density is increased by 15%, the similar dynamic performance is still kept; and moreover, the energy density of the prepared battery is improved by 1-1.5% compared with that of a conventional battery under the same positive electrode surface density (520-600g / m<2>).

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing positive and negative conductive liquid storage layer slurry and thick electrodes. Background technique [0002] As the energy density requirements of lithium-ion batteries increase year by year, related technical research is also getting deeper and deeper. From the perspective of existing technical reports, improving the energy density mainly starts from two aspects: (1) increasing the gram capacity of the positive and negative electrode materials. At present, the research has encountered a bottleneck, and the mature positive and negative electrode materials are close to the theoretical gram capacity. There is little chance of continued improvement or significant damage to other properties. Therefore, the material system must be completely replaced to achieve a qualitative breakthrough. In the short term, it is still very difficult; (2) Incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/66H01M10/0525
CPCH01M4/624H01M4/667H01M10/0525Y02E60/10
Inventor 龙海涛李亚辉吴丽军韩伟王亚峰陈亚
Owner 江苏智泰新能源科技有限公司
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