Unlock instant, AI-driven research and patent intelligence for your innovation.

Multilayer electrode of lithium ion battery and lithium ion battery

A lithium-ion battery and multi-layer electrode technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve the problems of increasing electrode thickness, deteriorating the energy density of the battery cell, and reducing the available space of the core, so as to reduce expansion force effect

Active Publication Date: 2020-10-16
SVOLT ENERGY TECHNOLOGY CO LTD
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of materials with small structural volume changes during the lithium-deintercalation process will sacrifice the specific capacity of the material and reduce the energy density of the cell; the cathode or anode is designed with a low compaction density, which will increase the thickness of the electrode and reduce the energy density of the cell. The available space of the core will deteriorate the energy density of the battery to a certain extent

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
  • Multilayer electrode of lithium ion battery and lithium ion battery
  • Multilayer electrode of lithium ion battery and lithium ion battery
  • Multilayer electrode of lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Take different electrode material powder particles, the cathode uses cathode active material (C-1 or C-2), polyvinylidene fluoride and conductive agent, uses N-methyl-2-pyrrolidone as solvent, prepares slurry, and coats it on aluminum foil surface, make the cathode pole piece; the anode uses the anode active material (A-1 or A-2), styrene-butadiene rubber, sodium carboxymethyl cellulose and conductive agent, uses deionized water as the solvent, configures the slurry, and coats it on The surface of the copper foil is used to make the anode sheet. The cathode and anode pole pieces are respectively used as the positive electrode, and the lithium sheet is used as the negative electrode to make a button battery, then test the charge and discharge capacity, and calculate the first charge and discharge efficiency.

[0052] Take the button cells C-1 and C-2 made of cathodes, charge them at 0.1C to 4.2V, then leave them for 5min, discharge them at 0.1C to 3.0V, and record the ch...

Embodiment 2

[0059] Embodiment 2: single-layer cathode pole piece (C-1), double-layer anode pole piece (the second coating: A-1, the first coating: A-2, the ratio of the second coating and the first coating 5:5)

[0060] Evenly coat the cathode slurry C-1 on the surface of the 12μm aluminum foil substrate, and the double-sided coating weight is 300g / m 2 , and then dried, rolled, die-cut, and punched into cathode sheets.

[0061] Pass the anode slurry A-1 into the upper cavity, and pass the anode slurry A-2 into the lower cavity. Then evenly coat the upper chamber and the lower chamber slurry on the surface of the 8μm copper foil substrate, and the double-sided coating weight is 160g / m 2 , by controlling the upper and lower chamber gaskets and the degree of clamping, the coating weight of the upper layer (second coating) is controlled to 80g / m 2 , the coating weight of the lower layer (first coating) is 80g / m 2 , that is, the weight distribution ratio of the upper and lower layers is 5:...

Embodiment 3

[0062] Embodiment 3: single-layer cathode pole piece (C-2), double-layer anode pole piece (the second coating: A-1, the first coating: A-2, the ratio of the second coating and the first coating 5:5)

[0063] Evenly coat the cathode slurry C-2 on the surface of the 12μm aluminum foil substrate, and the double-sided coating weight is 300g / m 2 , and then dried, rolled, die-cut, and punched into cathode sheets.

[0064] Pass the anode slurry A-1 into the upper cavity, and pass the anode slurry A-2 into the lower cavity. Then evenly coat the upper chamber and the lower chamber slurry on the surface of the 8μm copper foil substrate, and the double-sided coating weight is 160g / m 2 , by controlling the upper and lower chamber gaskets and the degree of clamping, the coating weight of the upper layer (second coating) is controlled to 80g / m 2 , the coating weight of the lower layer (first coating) is 80g / m 2 , that is, the weight distribution ratio of the upper and lower layers is 5:...

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
current efficiencyaaaaaaaaaa
current efficiencyaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a multilayer electrode of a lithium ion battery. The electrode comprises a current collector and an active material coating coated on the surface of the current collector, theactive material coating comprises a first coating coated on the surface of the current collector and a second coating coated on the surface of the first coating, wherein the specific capacity of theelectrode material of the first coating is smaller than the specific capacity of the electrode material of the second coating, and the first coulombic efficiency of the first coating is smaller than the first coulombic efficiency of the second coating. The battery can effectively reduce the expansion force generated in the long-term cycle process of the battery cell.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, and in particular, relates to a lithium ion battery multilayer electrode and a lithium ion battery. Background technique [0002] Electric vehicles are a type of transportation that needs to be considered for long-term wear and tear, and their long-term reliability needs to be fully guaranteed. As the core component of electric vehicles, the long-term reliability of power batteries is related to the long-term reliability of the entire vehicle. The main reason for the deterioration of long-term reliability is the expansion of the power cell during the cycling process. The expansion is mainly manifested as the increase in the thickness of the electrodes and the cell during the normal charge-discharge cycle. For the electrical performance of the battery, the expansion will seriously deteriorate the cathode-anode interface of the battery, resulting in uneven force on the interface, and ...

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): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525H01M2004/021H01M2220/20Y02E60/10
Inventor 郭明奎苏树发
Owner SVOLT ENERGY TECHNOLOGY CO LTD