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Battery cathode slurry, preparation and battery produced by the cathode slurry

A technology of battery negative electrode and negative electrode active material, applied in electrode manufacturing, battery electrode, non-aqueous electrolyte battery electrode, etc., can solve the problems of low volume specific capacity, poor processing performance, low compaction density, etc.

Inactive Publication Date: 2012-08-08
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing performance of artificial graphite, especially the processing performance of artificial graphite under the water-based formula is not very good, which is mainly reflected in the fact that it is easy to settle when the ingredients are prepared, and the compaction density is not too high. Therefore, although the lithium battery prepared by it The cycle performance is better, but there is still the defect that the volume specific capacity is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Selection of negative electrode slurry components (parts by weight):

[0019] Morphological untreated artificial graphite: 70.0

[0020] Natural flake graphite conductive agent: 1.0

[0021] Adhesive SBR: 1.0

[0022] Thickener sodium carboxymethylcellulose: 1.0

[0023] Solvent water: 80.0.

[0024] 2. Preparation of negative electrode slurry:

[0025] 1) Preparation of thickener glue: first put sodium carboxymethyl cellulose and 60% water into a mixer (egg beater or other type of mixer) and stir at a frequency of 1 Hz for 10 minutes to complete Glue making process;

[0026] 2) Pulping: the untreated artificial graphite and natural flake graphite conductive agent are stirred in a vacuum mixer at a frequency of 1 Hz for 10 minutes according to the above weight parts, and then 5% of thickener rubber is added. Frequency revolution and stirring for 10 minutes, then add the adhesive SBR and stir at 1Hz revolution and rotation for 10 minutes, then add the remaining ...

Embodiment 2

[0033] 1. Selection of negative electrode slurry components (parts by weight):

[0034] Natural Graphite: 10

[0035] Morphological untreated artificial graphite: 90

[0036] Natural flake graphite conductive agent: 2.5

[0037] Adhesive PTFE: 4.0

[0038] Thickener sodium carboxymethylcellulose: 1.5

[0039] Solvent water: 100.0.

[0040] 2. Preparation of negative electrode slurry:

[0041] 1) Preparation of thickener glue: first, low molecular weight sodium carboxymethyl cellulose (molecular weight distribution at 8-15W) and 35% solvent water are mixed in a mixer (which can be an egg beater or other types of mixers). Stir for 10 minutes, then add 25% of solvent water to continue stirring for 10 minutes, and finally add 39% of solvent water for 10 minutes to complete the gel making process.

[0042] 2) Pulping: Mix natural graphite, artificial graphite with untreated morphology and natural flake graphite conductive agent in a vacuum mixer at 10 Hz revolution for 1 hour...

Embodiment 3

[0049] 1. Selection of negative electrode slurry components (parts by weight):

[0050] Artificial graphite treated by ball milling (particle size 10 μm, degree of graphitization 90%): 100.0,

[0051] Microcrystalline graphite conductive agent: 5.0

[0052] Adhesive HPMC: 4.0

[0053] Thickener sodium carboxymethylcellulose (low molecular weight): 4.5

[0054] Solvent water: 150.0.

[0055] 2. Preparation of negative electrode slurry:

[0056] 1) Preparation of thickener glue: first, low molecular weight sodium carboxymethylcellulose (molecular weight distribution at 8-15W) and 20% solvent water are mixed in a mixer (it can be an egg beater or other types of mixers). Stir for 10 hours, then add 15% of solvent water to continue stirring for 10 hours, and finally add 25% of solvent water for 10 hours to complete the gel making process.

[0057] 2) Pulping: the ball-milled artificial graphite and microcrystalline graphite conductive agent were stirred in a vacuum mixer at 10...

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Abstract

The invention discloses slurry for battery negative electrodes, which comprises a carbon negative active material, a conductive agent, a thickening agent, a binding agent and a solvent, the proportion by weight of the carbon negative active material, the conductive agent, the thickening agent, the binding agent and the solvent is 70-130: 1-10: 1-10: 1-10: 80-200, wherein the carbon negative active material is a mixture of native graphite and artificial graphite of the proportion of 0-3: 7-10. The invention further discloses a preparing method of the slurry for battery negative electrodes and a battery manufactured by utilizing the negative electrode slurry. Based on the artificial graphite, the invention creates a proper negative material aqueous formula, which can significantly increase volumetric capacity of the negative electrode based on the artificial graphite on the premise of excellent circulation performance, and thereby a lithium ion battery with high volumetric capacity and long cycle life can be manufactured.

Description

technical field [0001] The invention relates to a chemical power source, in particular to a battery negative electrode slurry, a preparation method and a battery made using the negative electrode slurry. Background technique [0002] With the rapid development of electronic technology, lithium batteries that provide power for various portable electronic products are increasingly widely used. At present, lithium batteries have replaced nickel-cadmium batteries and nickel-metal hydride batteries in the field of small secondary batteries and become commercial secondary batteries. In order to meet the higher requirements of portable electronic products on the durability of their power sources, the research and development of lithium batteries is increasingly focusing on improving the specific energy and specific power. Therefore, there are higher requirements for chemical power materials. [0003] Natural graphite has a low interplanar spacing and high characteristic specific ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/62H01M4/04H01M10/40H01M4/13
CPCY02E60/12Y02E60/10
Inventor 黄加军滕鑫何伟何名牟方路孙定元
Owner ZHENGZHOU BAK BATTERY CO LTD
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