Paste for nonaqueous lithium ion battery positive electrode

A slurry technology for lithium-ion batteries and positive electrodes, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as high defect rate in the production process, poor bonding performance of slurry, loss of financial or material resources, etc., and achieve superior adhesion. Cohesion, improve bonding performance, improve the effect of bonding effect

Inactive Publication Date: 2012-01-04
HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor bonding performance of the slurry will directly cause adverse consequences such as scrapped pole pieces, poor battery performance, and high defect rate in the production process, which will bring financial or material losses to the enterprise

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Paste for nonaqueous lithium ion battery positive electrode
  • Paste for nonaqueous lithium ion battery positive electrode
  • Paste for nonaqueous lithium ion battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Lithium cobalt oxide (LiCoO 2) material is used as the positive electrode active material, ultrafine carbon powder is the conductive agent, polyimide is the binder, and N-methylpyrrolidone is the solvent. The ratio of the total mass of the three components of imide to the mass of N-methylpyrrolidone is 100:50, and the percentages of lithium cobaltate, conductive agent, and polyimide in the total mass of the three components are 97.5%. , 2.0%, 0.5%, and then go through the process of coating and sheet-making to make pole pieces. The maximum compaction density test and peeling test are carried out on the pole piece. It is 200mm / min. A single battery with a capacity of 850mAh was prepared using the above pole piece, and the battery was tested for 300 cycles under the condition of ±1C, the voltage range was 3.0-4.2V, the cut-off current of constant voltage charging was 0.05C, and after 300 cycles of testing The internal resistance of the battery. The obtained test result...

Embodiment 2

[0036] The ratio of the total mass of lithium cobaltate, conductive agent, and polyimide to the mass of N-methylpyrrolidone is 100:50, and lithium cobaltate, conductive agent, and polyimide account for the three components respectively The percentage content of the total mass is 97.0%, 2.0%, and 1.0%, and the others are completely made according to the conditions of Example 1, and all tests of Example 1 are carried out, and the obtained test results are shown in Table 1.

Embodiment 3

[0038] The ratio of the total mass of lithium cobaltate, conductive agent, and polyimide to the mass of N-methylpyrrolidone is 100:50, and lithium cobaltate, conductive agent, and polyimide account for the three components respectively The percentage content of the total mass is 96.5%, 2.0%, 1.5%, and the others are made completely according to the conditions of Example 1, and all tests of Example 1 are carried out, and the obtained test results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to paste for a nonaqueous lithium ion battery positive electrode. The paste comprises a positive electrode active substance, a conductive agent, a bonding agent and a solvent, wherein the proportioning ratio of the total mass of the three components, namely the positive electrode active substance, the conductive agent and the bonding agent to the mass of the solvent is 100:(40-130); and the content by percentage of each of the positive electrode active substance, the conductive agent and the bonding agent in the total mass of the three components is 92.5-97.6%, 1.9-3.5% and 0.5-4.0% respectively. By adopting the paste for the positive electrode provided by the invention, the peeling phenomenon between a coated layer and the foil layer of a current collector can be eliminated to a greater extent, the bonding property of the prepared lithium ion battery can be improved, the inner resistance of the battery can be reduced, and the capacity of the battery can be improved.

Description

Technical field: [0001] The invention relates to a non-aqueous lithium ion battery cathode slurry, which belongs to the technical field of chemical power supply preparation. Background technique: [0002] High comprehensive performance has always been the pursuit goal of the lithium-ion battery industry. In the manufacturing process of lithium-ion batteries, the batching and pulping stage is the first process and an extremely critical process. The quality of the slurry directly determines the follow-up process. Can manufacture high-performance high-quality batteries. For lithium-ion battery slurry, its bonding performance is a very important factor. For example, the bonding performance of the slurry is not good, and sometimes it cannot be seen after the electrode sheet coating is completed, but once the sheeting process is completed, the material layer and the foil Peeling will occur; in severe cases, the material layer and foil will be peeled off after drying when coating ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 金旭东罗朝晖
Owner HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap