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A negative electrode of a lithium ion battery

A lithium-ion battery and negative electrode technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as complex processes, and achieve the effects of reducing environmental pollution, reducing costs, and good high and low temperature performance

Active Publication Date: 2016-03-23
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses NMP as a solvent, and the process is more complicated

Method used

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  • A negative electrode of a lithium ion battery
  • A negative electrode of a lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Selection of negative electrode formula components (percentage by weight): MCMB (a kind of negative electrode active material, mesophase pitch-based carbon microspheres), Super-P (conductive carbon black), CMC (sodium carboxymethyl cellulose), The weight ratio of SBR (styrene-butadiene rubber), PVDF (polyylidene fluoride resin), and PAA (polyacrylic acid) is 95.5:1.2:1:1.2:1:0.1.

[0020] 2. Preparation of negative pole piece: first mix PVDF precursor water emulsion and SBR, add film forming agent, and stir to form a uniform mixed adhesive. Add MCMB and Super-P into the mixer, add diluted CMC and stir for 120 minutes, then add the mixed binder and stir for 60 minutes, adjust the viscosity with water during the stirring process, and make the final negative electrode slurry, and then mix the slurry according to a certain The width is coated on both sides of the negative electrode current collector (copper foil) with a thickness of 9 μm, and the negative electrode sheet...

Embodiment 2

[0024] 1. Selection of negative electrode formulation components (percentage by weight): MCMB, CMC, SBR, PVDF, and PAA are in a weight ratio of 98:0.99:0.5:0.5:0.01.

[0025] 2. Preparation of negative pole piece: first mix PVDF precursor water emulsion and SBR, add film forming agent, and stir to form a uniform mixed adhesive. Add MCMB into the mixer, add diluted CMC and stir for 30 minutes, then add the mixed binder and stir for 30 minutes, adjust the viscosity with water during the stirring process, and make the final negative electrode slurry, and then spread the slurry on the The two sides of the 9 μm thick negative electrode current collector (copper foil) were cold-pressed and sliced ​​to obtain the negative electrode sheet.

[0026] 3. Prepare positive electrode and battery according to the method of Example 1.

Embodiment 3

[0028] 1. Selection of negative electrode formulation components (percentage by weight): MCMB, Super-P, CMC, SBR, PVDF, and PAA are in a weight ratio of 88:3:2.5:3:3:0.5.

[0029] 2. Preparation of negative pole piece: first mix PVDF precursor water emulsion and SBR, add film forming agent, and stir to form a uniform mixed adhesive. Add MCMB and Super-P into the mixer, add diluted CMC and stir for 240 minutes, then add the mixed binder and stir for 180 minutes, adjust the viscosity with water during the stirring process, and make the final negative electrode slurry, and then mix the slurry according to a certain The width is coated on both sides of the negative electrode current collector (copper foil) with a thickness of 9 μm, and the negative electrode sheet is obtained by cold pressing and slicing.

[0030] 3. Prepare positive electrode and battery according to the method of Example 1.

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Abstract

The invention belongs to the field of lithium-ion batteries, and in particular relates to a negative electrode of a lithium-ion battery. In the formula of the pole piece: 88-98% of active material, 0-3% of conductive agent, 0.5-3% of thickener, The film-forming agent is 0.01-0.5%, and the uniqueness is that it has a mixed binder of SBR and PVDF. Wherein, the binder SBR is 0.5-3%, the binder PVDF is 0.5-3%, and water is used as a solvent, and the binder PVDF is its powder precursor. And water is used as a solvent to overcome the technical difficulties of using NMP as a solvent for traditional PVDF.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a negative electrode of the lithium ion battery. Background technique [0002] As a green battery, lithium-ion secondary battery has the advantages of high working voltage, high specific energy and long cycle life. It has been developed rapidly in recent years. and other mobile devices are becoming more and more widely used. At the same time, due to the changes in the regions and seasons in which mobile devices are used, lithium-ion batteries are required to have a wider operating temperature range. In addition, many customers also have requirements for fast charging performance. At present, there are generally two types of negative electrode sheets for lithium-ion batteries: water-based (the solvent is water) or oil-based (the solvent is NMP (N,N-dimethylpyrrolidone)). [0003] For water-based negative lithium-ion batteries, since CMC-SBR itself is also a colloid that doe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 张小细劳绍江张丽罗丹涂健李明
Owner DONGGUAN AMPEREX TECH