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

Electrode plate and preparation method thereof, and lithium ion battery

A technology for lithium-ion batteries and electrode pole pieces, which is applied to battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., and can solve the problems of increased cost of battery cell preparation, limited improvement in the conductivity of pole pieces, and broken belts. Achieve the effects of easy industrialized large-scale production, reduced weight ratio, and excellent specific energy

Pending Publication Date: 2020-07-03
HUBEI JINQUAN NEW MATERIALS CO LTD
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although CN106450433 proposes the use of mesh foil, which reduces the amount of copper foil and aluminum foil used, reduces the weight of the battery without changing its power performance, and improves the energy density of the battery; but it uses a mesh structure. Foil, so that it can only be used for the preparation of soft-packed batteries, the use of mesh foils in the production of industrialized large batteries will increase the cost of preparing batteries and there will be a risk of breaking the tape during the manufacturing process
[0004] CN208690386U proposes to improve the ionic and electronic conductivity of the pole piece by mechanically punching holes on the surface of the pole piece after rolling, and improve the rate performance of the battery, but it is limited to the promotion of the conductivity of the pole piece in the actual operation process

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
  • Electrode plate and preparation method thereof, and lithium ion battery
  • Electrode plate and preparation method thereof, and lithium ion battery
  • Electrode plate and preparation method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This embodiment provides an electrode pole piece, the electrode pole piece is a positive pole piece, the electrode pole piece includes a current collector and active material layers located on both sides of the current collector, and the thickness of the current collector of the electrode pole piece is is 0.02mm, and the pole piece thickness is 0.320mm. The current collector is aluminum foil, and the active material layer includes a positive electrode active material, a conductive agent and a binder, and the mass ratio of the conductive agent, active material and binder is 1.0:97:2.0; the positive electrode active material is lithium iron phosphate; the conductive agent is The combination of carbon nanotubes and graphene, the mass ratio of carbon nanotubes and graphene is 50:50, the diameter of the carbon nanotubes is 5-11nm, and the length of the tubes is 10-30 μm; the binding agent is PVDF (poly vinylidene fluoride). The electrode pole piece has holes on the active m...

Embodiment 2

[0078] The electrode sheet provided in this example has a thickness of 0.472mm, and the through hole penetrates the active material layer, and the coating surface density of each side of the current collector is 292g / m during preparation. 2 (Total coating density on both sides is 584g / m 2 ) except that others are identical to the electrode pole piece of embodiment 1 copper.

Embodiment 3

[0080] The electrode sheet provided in this example has a thickness of 0.625 mm, and the through hole penetrates the active material layer. The coating surface density of each side of the current collector is 389.5 g / m during preparation. 2 (Total coating density on both sides is 779g / m 2 ) except that others are identical to the electrode pole piece of embodiment 1 copper.

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
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides an electrode plate and a preparation method thereof, and a lithium ion battery. The electrode plate comprises a current collector and active substance layers positioned on two sides of the current collector, wherein the active substance layers are provided with holes, and the thickness of the electrode plate is more than 0.30 mm. The preparation method comprises the following steps: 1) coating two surfaces of the current collector with electrode slurry, and carrying out drying and rolling to obtain an unpunched electrode plate, wherein the thickness of the electrode plate which is not punched is 0.30 mm or above; and 2) punching the active substance layers of the unpunched electrode plate to obtain the electrode plate. According to the electrode plate provided by theinvention, by increasing the thickness of the electrode plate, the proportion of the current collector is reduced, and specific energy is improved; the electronic conductivity of the electrode plateis improved through the variety and proportion of a conductive agent; by punching holes in the active substance layers, the liquid absorption property of the electrode plate is improved, the polarization internal resistance of the electrode plate is reduced, the optimization of the ionic conductance of the electrode plate is improved, and the rate capability of the battery is maintained.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to an electrode pole piece, a preparation method thereof and a lithium ion battery. Background technique [0002] With the improvement of the energy density requirement of the battery, part of the power performance of the battery cell is sacrificed in the design. In order to make the battery cell have a high energy density and good power performance, the thickness of the current electrode pole piece of the lithium-ion battery is <0.2mm . However, this requires a larger area of ​​copper foil, aluminum foil and other heavy inactive materials in the design of the battery. This design reduces the battery's weight-to-energy ratio. [0003] Although CN106450433 proposes the use of mesh foil, which reduces the amount of copper foil and aluminum foil used, reduces the weight of the battery without changing its power performance, and improves the energy density of the battery; but it us...

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): H01M4/13H01M4/139H01M4/62H01M10/0525
CPCH01M4/13H01M4/139H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 苑丁丁王先文魏成卓吕正中
Owner HUBEI JINQUAN NEW MATERIALS 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