Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet

A technology for lithium-ion batteries and positive pole pieces, which is applied in the direction of non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve problems such as reducing battery costs, and achieve the effect of improving rate performance and improving charge-discharge rate performance

Active Publication Date: 2013-10-23
DONGGUAN AMPEREX TECH
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the many technical efforts, most of the technologies can only meet the requirements of one aspe

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
  • Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet
  • Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet
  • Lithium ion battery positive electrode sheet and battery comprising positive electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1, Such as figure 1 As shown, a positive pole piece of a lithium ion battery, the positive pole piece 1 is provided with a crack structure, the opening of the crack structure is provided on the surface of the pole piece, and the surface density of the crack 3 of the crack structure is 100m / mm 2 , The width of the crack 3 is 5um, the length of the crack 3 is 5um, the cross-sectional shape of the crack 3 is triangle, and the thickness of the pole piece completely penetrates the crack 3. The positive pole piece 1 is obtained by stirring, coating, and preparing cracks. The positive pole piece 1 used uses lithium cobalt oxide as the active material, and stirs to prepare the positive electrode slurry according to the positive electrode formula (lithium cobalt oxide: polyvinylidene fluoride: superconducting carbon=96.0%:2.0%:2.0%), and then The positive electrode slurry is coated on the aluminum foil current collector to prepare the positive pole piece 1, and then the p...

Example Embodiment

[0023] Example 2, Such as figure 2 As shown, the difference from embodiment 1 is: the surface density of crack 3 in this embodiment is 1000m / mm 2 , The width of the crack 3 is 12um, the length of the crack 3 is 8um, the cross-sectional shape of the crack 3 is trapezoid, and the thickness of the pole piece completely penetrates the crack 3. The positive pole piece 1 used uses cobalt nickel cobalt manganese as the active material, and the distribution ratio of each group in the positive pole piece 1 is nickel cobalt manganese: polyvinylidene fluoride: superconducting carbon=96.0%:2.0%:2.0%. The positive pole piece 1 is cold pressed (compact density 4.20g / cc), and the negative pole piece, diaphragm, electrolyte and packaging bag are assembled into a finished cell.

[0024] Others are the same as in Example 1, and will not be repeated here.

Example Embodiment

[0025] Example 3, Such as image 3 As shown, the difference from embodiment 2 is that the surface density of crack 3 in this embodiment is 10m / mm 2 , The width of the crack 3 is 1um, the length of the crack 3 is 9um, the cross-sectional shape of the crack 3 is rectangular, and the thickness of the pole piece is not completely penetrated by the crack. The positive pole piece 1 used uses lithium iron phosphate as the active material. According to the positive electrode formula (lithium iron phosphate: polyvinylidene fluoride: superconducting carbon = 96.0%: 2.0%: 2.0%), the positive electrode slurry is prepared by stirring, and then the The positive electrode slurry is coated on the aluminum foil current collector to prepare the positive pole piece 1, and then the positive pole piece 1 is cold pressed (compact density is 4.20g / cc), and the negative pole piece, separator, electrolyte and packaging bag are assembled into Finished batteries.

[0026] Others are the same as in Embodim...

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
Widthaaaaaaaaaa
Widthaaaaaaaaaa
Widthaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of lithium ion battery, and especially relates to a positive electrode sheet of a lithium ion battery. The positive electrode sheet is provided with a crack structure, wherein the opening of the crack structure is provided on the surface layer of the electrode sheet. With the crack structure, absorption rate of the electrode sheet upon electrolyte can be greatly improved, and standing time after liquid injection of the lithium ion battery can be reduced. In a lithium ion battery with the crack structure, with the existence of the crack, a highway is provided for rapid transmission of the electrolyte in the electrode sheet, and battery charge/discharge rate capability is greatly improved. Also, the invention discloses a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive pole piece of a lithium ion battery and a battery including the pole piece. Background technique [0002] Since the large-scale commercialization of lithium-ion batteries, they have been widely used in portable electrical appliances such as laptops, cameras, and mobile communications due to their advantages of high energy density and high power density. Although the market demand is increasing, the competition faced by lithium-ion battery manufacturers is also becoming more and more fierce. On the one hand, the fierce competition is reflected in the comparison of the performance of lithium-ion batteries, and on the other hand, it is reflected in the level of battery manufacturing costs. [0003] In order to improve the competitiveness of products, lithium-ion battery manufacturers have been working on improving battery performance and reducin...

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
IPC IPC(8): H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李白清张盛武游从辉张柏清
Owner DONGGUAN AMPEREX TECH
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