Pole piece, preparation method thereof and lithium ion battery

A lithium-ion battery and pole piece technology, which is applied in the field of battery preparation, can solve the problems of difficult penetration of pore-forming agents and poor pore-making effects, and achieve the effects of reducing resistivity, improving wetting and absorption effects, and improving rolling effects

Pending Publication Date: 2020-02-04
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the pore-forming process, the pore-forming agent is also difficult to penetrate, resulting in poor pore-forming effect

Method used

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  • Pole piece, preparation method thereof and lithium ion battery
  • Pole piece, preparation method thereof and lithium ion battery
  • Pole piece, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) camphor is mixed with nitrogen methyl pyrrolidone to obtain a positive electrode pore-forming solution with a concentration of 2.5mol / L, and oxalic acid is mixed with water to obtain a negative electrode pore-formed solution with a concentration of 0.5mol / L;

[0081] (2) According to the ratio of positive electrode active component (lithium iron phosphate): positive electrode binder (PVDF): positive electrode conductive agent (conductive graphite) at 8:1:1, mix with solvent NMP to prepare positive electrode slurry, and then mix positive electrode slurry Coated on both sides of the positive electrode current collector (aluminum foil) to obtain a coated positive electrode sheet, the single surface density of the coated positive electrode sheet is 20mg / cm 2 , the density of both sides is 40mg / cm 2 ;

[0082] (3) Negative electrode slurry is prepared by negative electrode active component (artificial graphite): negative electrode binder (SBR): dispersant (CMC): negativ...

Embodiment 2

[0088] The difference from Example 1 is that the concentration of the positive electrode pore-forming solution in step (1) is 2 mol / L.

Embodiment 3

[0090] The difference from Example 1 is that the concentration of the positive electrode pore-forming solution in step (1) is 3 mol / L.

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Abstract

The invention relates to a pole piece, a preparation method thereof and a lithium ion battery. According to the invention, the positive / negative pole piece is subjected to shape-setting cold pressingby adopting a pressing roller with a specific shape, the pressing roller is provided with hemispherical or football-shaped bumps so as to enable the pressed material to have pits which are continuously and uniformly distributed; a pore-forming agent is applied to the surface of the cold-pressed pole piece by means of transfer coating for pore forming so as to obtain the pole piece with a gradientporosity structure. The preparation method of the pole piece with the gradient porosity structure has the advantages that the operation is simple, feasible and efficient, and a solution is provided for the problem of thick pole pieces in the development process of high-specific-energy batteries. According to the pole piece with the gradient porosity structure, the infiltration and absorption effects of an electrolyte can be improved, the specific surface area of the material is increased, the ion / electron transmission rate is increased, the resistivity is reduced, the high energy density of the designed material is achieved, and then the requirements of a new energy automobile for a power battery are met.

Description

technical field [0001] The invention belongs to the technical field of battery preparation, and in particular relates to a pole piece, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion secondary batteries are widely used in consumer electronics, energy storage, and power due to their advantages such as high output voltage, high energy density, high power density, long cycle life, and good environmental friendliness. In recent years, with the continuous development of new energy vehicles, the demand for power performance of lithium-ion batteries continues to increase. This puts forward higher and higher requirements on the energy density, safety and cycle life of batteries, especially the high energy density. In the research and development of high energy density batteries, the preferred method is to continuously increase the active material content per unit mass. Therefore, battery manufacturers increase the relative occupanc...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139H01M4/13H01M10/0525
CPCH01M4/139H01M4/13H01M4/0435H01M4/0433H01M10/0525H01M2004/021Y02E60/10
Inventor 吴剑魏成卓阳伟强黄彬彬郭红祥杜双龙苑丁丁吕正中刘金成
Owner EVE ENERGY CO LTD
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