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

A kind of electrode pole piece and its preparation method and application

A technology of electrode sheet and electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor power performance, sacrificing energy density, low battery energy density, etc., to improve thermal runaway safety and improve thermal runaway safety. performance effect

Active Publication Date: 2022-04-15
SVOLT ENERGY TECHNOLOGY CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spherical core-shell structure lithium iron phosphate positive electrode material prepared by using it has good conductivity, high tap density, and uniform particle size, but it will greatly sacrifice energy density, resulting in low energy density and poor storage performance of the battery.
[0005] The above schemes have problems of poor conductivity, poor power performance, or low energy density. Therefore, it is necessary to develop an electrode pole piece that improves thermal runaway stability while taking energy density and power density into account.

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 kind of electrode pole piece and its preparation method and application
  • A kind of electrode pole piece and its preparation method and application
  • A kind of electrode pole piece and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The present embodiment 1 provides a kind of lithium-ion battery, and described lithium-ion battery is made by following method:

[0054] (1) The above-mentioned A1 is used as the upper positive electrode slurry, and the above-mentioned A3 is used as the lower positive electrode slurry. The upper layer of slurry is passed into the upper chamber, and the lower layer of slurry is passed into the lower chamber. The upper and lower layers are controlled by adjusting the upper and lower chamber gaskets and the degree of clamping. The coating thickness ratio is 1:1, and the slurry is evenly coated on the surface of the 12μm aluminum foil substrate, and the double-sided coating weight is 250g / m 2 , and then dried at 100°C for 150s, rolled, die-cut, and punched into positive pole pieces. The structure diagram of the positive pole piece is as follows figure 1 shown.

[0055] (2) The above-mentioned B1 is used as the upper negative electrode slurry, and the above-mentioned B2 is ...

Embodiment 2

[0058] The present embodiment 1 provides a kind of lithium-ion battery, and described lithium-ion battery is made by following method:

[0059] (1) The above-mentioned A2 is used as the upper positive electrode slurry, and the above-mentioned A4 is used as the lower positive electrode slurry. The upper layer of slurry is passed into the upper cavity, and the lower layer of slurry is passed into the lower cavity. The upper and lower layers are controlled by adjusting the upper and lower cavity gaskets and the clamping degree The coating thickness ratio is 1:1, and the slurry is evenly coated on the surface of the 12μm aluminum foil substrate, and the double-sided coating weight is 270g / m 2 , and then dried at 100°C for 150s, rolled, die-cut, and punched into positive pole pieces.

[0060] (2) Use the above-mentioned B1 as the negative electrode slurry, and evenly coat the slurry on the surface of a 12 μm aluminum foil substrate, and the double-sided coating weight is 130g / m 2 ...

Embodiment 3

[0063] The difference between this example and Example 1 is that A2 is selected as the slurry for the upper layer of the positive electrode, and A4 is selected for the slurry for the lower layer of the positive electrode. Other conditions and parameters are exactly the same as those of Example 1.

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
viscosityaaaaaaaaaa
internal resistanceaaaaaaaaaa
poweraaaaaaaaaa
Login to View More

Abstract

The invention provides an electrode pole piece and its preparation method and application, the electrode pole piece includes a positive pole piece and / or a negative pole piece, the electrode pole piece includes an electrode material and a current collector, and the electrode material includes n A layer of electrode material, the n ≥ 2, the electrode material includes a flame retardant, the n-layer electrode material and the current collector are stacked in sequence; wherein, the electrode material on the side close to the current collector is the lower electrode material, far away from the current collector The electrode material on one side is the upper electrode material. From top to bottom, the mass content of the flame retardant in the electrode decreases layer by layer. The electrode sheet of the present invention can more effectively improve the thermal runaway of the battery without affecting the power performance. Safety performance. At the same time, through the gradient distribution of the upper and lower flame retardants, the mass content of the upper flame retardant is controlled to be higher than that of the lower layer, which can improve the thermal runaway safety performance without losing the energy density of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an electrode pole piece and a preparation method and application thereof. Background technique [0002] With the development of electric vehicles, the safety of electric vehicles has received more and more attention. As the core component of electric vehicles, the safety of power batteries directly affects the safety of electric vehicles. In recent years, car companies have set requirements for the safety performance of power batteries. It is also getting higher and higher. The current national standard requires passengers to have at least 5 minutes of escape time. From batteries to modules to battery packs, safety design needs to be considered at all levels. [0003] CN111244553A discloses a safe electrolyte solution for lithium nickel phosphate high-voltage lithium battery. The electrolyte includes the following components: an organic solvent, lithium salt micelles...

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): H01M10/42H01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M10/0525A62C3/16
CPCH01M10/4235H01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M10/0525A62C3/16Y02E60/10
Inventor 郭明奎苏树发
Owner SVOLT ENERGY TECHNOLOGY CO LTD