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

Lithium ion battery composite negative pole piece with high specific energy and lithium ion battery thereof

A lithium-ion battery and negative pole piece technology, which is applied in non-aqueous electrolyte battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor uniformity of lithium supplementation of lithium powder, reduced compaction density, and high lithium-ion batteries. , to achieve the effects of improving efficiency and safety performance, increasing energy density, and simplifying the processing process

Inactive Publication Date: 2017-08-11
JIANGSU LENENG BATTERY INC
View PDF5 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through this method, after the lithium powder dissolves, a lot of holes will be left inside the pole piece, or the surface of the pole piece will become uneven, which not only reduces the compaction density, but also greatly affects the conduction of electrons in the negative electrode. Influence (impedance increase), at the same time, lithium powder is exposed to the air and easily absorbs water, resulting in reduced effect and potential safety hazards, and the uniformity of lithium supplementation using lithium powder is poor, and the process is difficult to control, making its actual effect difficult to meet the design requirements
The safety hazard caused by lithium powder can be avoided by using lithium sheets, but due to the use of lithium sheets, the lithium content of lithium-ion batteries will be too high, resulting in poor structural stability and low tap density, which will affect the lithium-ion batteries. adverse effect on electrochemical performance

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 composite negative pole piece with high specific energy and lithium ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a high specific energy lithium-ion battery composite negative pole piece, the steps are:

[0021] 1. First, weigh 3g of LA132 binder and dissolve it in 150g of twice distilled water to disperse evenly, add 3g of carbon nanotubes and disperse evenly, add 94g of hard carbon, and disperse evenly at high speed to obtain active material slurry A for future use;

[0022] 2. Weigh 60g of polyalkylene carbonate, dissolve it in 500ml of carbon tetrachloride and disperse evenly, then add 40g of ammonium triacrylonitrile pyrophosphate and disperse evenly by ultrasonic to obtain protective solution B for future use;

[0023] 3. Coat the active material slurry A on the surface of mesh copper foil (50% porosity, 20 μm thickness) through a high-precision coating machine, and obtain pole roll C after drying; then use a roller press for preheating, Heating to 120°C, passing the grid-shaped lithium sheet (80% porosity, 5mm thickness) and the pole roll C through a ...

Embodiment 2

[0026] 1. First, weigh 1g of sodium alginate binder and dissolve it in 150g of twice distilled water to disperse evenly, add 4g of graphene and disperse evenly, add 95g of hard carbon, and disperse evenly at high speed to obtain active material slurry A for future use ;

[0027] At the same time, 40g of polyalkylene oxide was weighed and dissolved in 500ml of carbon tetrachloride to disperse evenly, then add 60g of ammonium polyphosphate and ultrasonically disperse evenly to obtain protective solution B for subsequent use;

[0028] 2. After that, the active material slurry A is coated on the surface of the mesh copper foil (porosity 40%, thickness 30 μm) by a high-precision coating machine, and after drying, a pole roll C is obtained; then preheated by a roller press , heated to 80°C, and the grid-shaped lithium sheet (porosity 70%, thickness 10mm) and the pole roll C are passed through a roller press, and the grid-shaped lithium sheet is pressed on the middle surface of the p...

Embodiment 3

[0031] 1. First weigh 5g of LA132 binder and dissolve it in 150g of twice distilled water to disperse evenly, add 5gSP conductive agent and disperse evenly, add 90g of hard carbon, and disperse evenly at high speed to obtain active material slurry A for future use;

[0032] 2. At the same time, weigh 80g of polyalkylmethacrylate and dissolve it in 500ml of carbon tetrachloride to disperse evenly, then add 20g of melamine polyphosphate and ultrasonically disperse evenly to obtain protective solution B for future use;

[0033] 3. Coat the active material slurry A on the surface of mesh copper foil (porosity 60%, thickness 10 μm) through a high-precision coating machine, and after drying, obtain a pole roll C; then use a roller press for preheating, Heating to 150°C, passing the grid-shaped lithium sheet (90% porosity, 1mm thickness) and the pole roll C through a roller press, pressing the grid-shaped lithium sheet on the middle surface of the pole roll C, and obtaining the pole r...

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
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of lithium ion battery preparation, and discloses a lithium ion battery composite negative pole piece with high specific energy. The composite negative pole piece is of a laminated structure, and comprises a netted copper foil current collector (1), an active substance layer (2) coated on the surface of the netted current collector, a netted precoating lithium layer (3) and a protective layer (4) sprayed on the outermost layer in sequence from inside to outside. The composite negative pole piece is characterized in that the porosity of the netted copper foil current collector (1) is 40% to 60%, mesh openings are circles or rhombus in shape, and the thickness is 10 to 30 microns. In the invention, the prepared negative pole piece applied to the lithium ion battery has the advantages of high processability, high rate performance, high energy density and the like, and is applied to pure electric cars.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion batteries, in particular to a high specific energy lithium ion battery composite negative pole piece and the lithium ion battery. Background technique [0002] With the rapid development of electric vehicles and digital electronics, lithium-ion batteries with larger capacity and more durability are required to be used in electric vehicles and their electronic products. At present, the energy density of commercialized electric vehicle batteries is about 130Wh / kg, the number of cycles is about 2000, and the general mileage is 100-200 kilometers, which makes it difficult to popularize electric vehicles; therefore, research and development of higher energy density and longer cycle life The power battery is very necessary. At present, the main ways to increase the density of power batteries are: 1) Using high-capacity, high-pressure positive and negative electrode materials, such as ternary m...

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): H01M4/13H01M10/0525H01M10/058
CPCH01M4/13H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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