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

A negative electrode sheet, preparation method and lithium-ion battery comprising the same

A negative electrode sheet and a negative electrode technology are applied in the field of the negative electrode sheet, the preparation method and the lithium ion battery including the same, to achieve the effects of improving the cycle life, improving the kinetic performance and improving the problem of lithium precipitation

Active Publication Date: 2021-11-09
ZHUHAI COSMX BATTERY CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode sheet is mainly used to solve the problem of lithium analysis in the single-sided coating area of ​​the negative electrode of the battery cell with a winding structure during the long cycle process under the high-rate fast charging system

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 negative electrode sheet, preparation method and lithium-ion battery comprising the same
  • A negative electrode sheet, preparation method and lithium-ion battery comprising the same
  • A negative electrode sheet, preparation method and lithium-ion battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The first step: prepare the slurry that forms the first negative electrode active material layer: the first negative electrode active material (artificial graphite), the first conductive agent (conductive carbon black) and the first binder (sodium carboxymethyl cellulose) Add it into the stirring tank according to the mass ratio of 94:4.5:1.5, add deionized water to prepare the slurry forming the first negative electrode active material layer, and the solid content of the negative electrode slurry is 40wt%~45wt%;

[0067] The second step: prepare the slurry forming the second negative electrode active material layer: the second negative electrode active material (artificial graphite), the second conductive agent (conductive carbon black) and the second binding agent (sodium carboxymethyl cellulose) According to the mass ratio of 97.5:1:1.5 into the stirring tank, add deionized water to prepare the slurry forming the second negative electrode active material layer, the so...

Embodiment 2-4 and comparative example 1-2

[0074]The other operating steps are the same as in Example 1, the difference is only that the mass percentages of the components in the first negative electrode active material layer and the second negative electrode active material layer are different, as shown in Table 1, and in the single-sided coating area Thickness, the thickness of the first negative electrode active material layer and the second negative electrode active material layer in the double-sided coating area are different, and in comparative example 1, only coat the first negative electrode active material layer (specific structure such as figure 2 shown), in comparative example 2, only the second negative electrode active material layer is coated (the specific structure is as figure 2 shown), as shown in Table 2.

[0075] The mass percentage of active material layer in the negative electrode sheet of table 1 embodiment 1-4 and comparative example 1-2

[0076] The mass percentage content of each...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a negative electrode sheet, a preparation method and a lithium ion battery containing the same. The negative electrode sheet includes a negative electrode collector, and the negative electrode collector includes a single-sided coating area and a double-sided coating area; in the double-sided coating area, a second coating layer is provided on both sides of the negative electrode current collector, and the The second coating layer includes a first negative electrode active material layer and a second negative electrode active material layer, the second negative electrode active material layer is arranged on the surface of the negative electrode current collector, and the first negative electrode active material layer is arranged on the second negative electrode active material layer. material surface. The lithium-ion battery comprising the negative electrode sheet has the following effects: (1) it can effectively improve the lithium-ion problem in the single-sided coating area of ​​the lithium-ion battery with a conventional winding structure, improve the cycle life of the lithium-ion battery, and reduce the lithium-ion battery life. cycle expansion. (2) Improve the compaction of the negative electrode and increase the energy density of the battery cell. (3) Improve the dynamic performance of the negative electrode and improve the fast charging ability of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative electrode sheet, a preparation method and a lithium ion battery containing the same. Background technique [0002] With the rapid development of modern society, portable electronic devices (mobile phones, computers, etc.) are increasingly used. Lithium-ion batteries are widely used in portable mobile electronic device terminals because of their long cycle life and high power density. At present, it seems that fast charging lithium-ion batteries have become the main development trend of consumer lithium-ion batteries. The development of fast-charging lithium-ion battery technology has brought convenience to people, but it has also brought safety problems. Lithium-ion batteries are very likely to cause lithium-ion deposition at the negative electrode of lithium-ion batteries during long cycles under high-rate fast charging conditions, especiall...

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): H01M4/133H01M4/1393H01M10/0525H01M10/0587
CPCH01M4/133H01M4/1393H01M10/0525H01M10/0587H01M2004/027Y02E60/10Y02P70/50
Inventor 张保海彭冲贺伟施超李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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