Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A positive pole piece and a secondary battery using the positive pole piece

A technology for positive pole pieces and positive current collectors, which is applied in the field of secondary batteries, and can solve problems such as the inability to prevent the exposure of aluminum foil and the inability to completely eliminate the short circuit of the positive current collector

Active Publication Date: 2022-03-01
CONTEMPORARY AMPEREX TECH CO
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of the mechanism of the internal short circuit of the battery cell, the most important thing to prevent the internal short circuit of the lithium-ion battery from being out of control is to avoid the exposure of the positive electrode current collector (aluminum foil). The cross-section is exposed when the aluminum foil is broken, so it is still impossible to completely eliminate the short circuit between the positive electrode current collector and the negative electrode

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
  • A positive pole piece and a secondary battery using the positive pole piece
  • A positive pole piece and a secondary battery using the positive pole piece
  • A positive pole piece and a secondary battery using the positive pole piece

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] There are two main methods for the preparation of grafted polymers:

[0048] Method 1: Activate a pre-polymerized polymer by chemical or physical chemical methods to generate active centers (indicated by *) on the main chain, which can be free radicals, positive or negative ions. Then it initiates the polymerization of monomer M to form a graft copolymer. This method is called the method of grafting branches on the polymer.

[0049] Method 2: Adding a graft monomer while initiating the polymerization of the main chain monomer, so that the main chain monomer and the graft-modified monomer M are polymerized simultaneously to form a graft-modified polymer.

[0050] Wherein, M is used as a graft-modified monomer, and if it has polymerization reaction functional groups such as C=C and -OH, and can undergo polymerization reaction, method 2 can be adopted. If M itself does not contain a group capable of participating in the polymerization reaction, the first method is adopted...

Embodiment 1

[0090] Extension layer preparation

[0091] After mixing the polymer and the conductive agent, adding a solvent, stirring evenly to obtain the extension layer slurry, and then coating the extension layer slurry on the surfaces of both sides of the positive current collector, and drying to obtain the extension layers 1-13. Wherein the oily polymer uses N-methylpyrrolidone as a solvent, and the water-based polymer uses deionized water as a solvent. The positive current collector is made of aluminum foil with a thickness of 12 μm. The types of polymer and conductive agent, the mass ratio of the two added, the thickness of the extension layer, the ratio of the extension rate of the extension layer to the positive electrode collector, and the conductivity ratio of the extension layer to the positive electrode collector are shown in Table 1. In the polymer column, take "styrene-butadiene rubber-g-octadecene, 6.3:1" as an example, which means that the mass ratio of styrene-butadien...

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

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The present application relates to a positive electrode sheet, and an extension layer containing a specific polymer and a conductive agent is arranged between the positive electrode current collector and the positive electrode active material layer. The extension layer includes a polymer and a conductive agent, and the ratio of the extension ratio of the extension layer to the positive current collector is (2-10):1. When the battery cell is abused, the extension layer can prevent the battery cell from a high-power short circuit without reducing the battery capacity.

Description

technical field [0001] The present application relates to the field of secondary batteries, in particular, to a positive pole piece and a secondary battery using the positive pole piece. Background technique [0002] Secondary batteries, especially lithium-ion batteries, have the characteristics of small size, high energy, and no pollution, and have been widely used in mobile devices, high-power power equipment (such as electric vehicles) and energy storage power stations. However, how to ensure the safety of lithium-ion batteries has become a major research topic for major lithium battery manufacturers. [0003] When a lithium-ion battery is bumped or the battery is invaded by foreign objects, it will cause a short circuit inside the battery. At present, for lithium-ion batteries, the most serious short-circuit method is the short-circuit between the positive electrode current collector and the negative electrode. In this method, the short-circuit power is extremely high, ...

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 Patents(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/667H01M10/0525Y02E60/10
Inventor 武卫忠陈小波
Owner CONTEMPORARY AMPEREX TECH CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com