Porous pole piece and preparation method thereof and lithium ion battery

A pole piece and pore-forming agent technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problem that the battery rate performance and cycle performance cannot be further improved, the rate performance is difficult to continue to improve, and lithium ion diffusion is hindered speed and other issues, to achieve the effect of accelerating lithium ion diffusion, high porosity, and easy operation

Inactive Publication Date: 2016-06-01
OPTIMUM BATTERY CO LTD
View PDF3 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the nanometerization of materials, the process requirements are more stringent, and the processing performance requirements of materials are also significantly improved. The thin surface density requires higher precision of the coating machine and higher cost of end welding
Therefore, if the above method is fully adopted, it is still difficult to continue to improve the rate performance to meet the needs.
Especially for cylindrical batteries, at high r

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] Prepare the positive pole piece and negative pole piece according to the following formula:

[0034] Positive electrode slurry formula: active material (T11R): conductive agent 1 (SP): conductive agent 2 (KS-6): pore former (ammonium chloride): binder (PVDF)=92:4:1:1 :2;

[0035] Anode slurry formula: active material (lithium titanate LTO): conductive agent 1 (SP): conductive agent 2 (KS-6): pore former (ammonium chloride): binder (PVDF) = 90:4: 1:1:3.

[0036] Coating the above-mentioned homogeneously mixed substances on the aluminum foil current collector;

[0037] Adjust the oven temperature to 100-150°C, place the above aluminum foil or copper foil current collector on the conveyor belt and bake in the oven;

[0038] After cooling and baking the pole pieces at room temperature, a porous positive electrode piece and a porous negative electrode piece are obtained respectively.

[0039] The positive electrode sheet and the negative electrode sheet without pore...

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

No PUM Login to view more

Abstract

The invention is suitable for the field of lithium ion batteries, and provides a preparation method of a porous pole piece. The preparation method comprises the following steps: mixing a pore forming material and slurry to obtain a mixture, and coating a pole piece with the mixture; and baking the pole piece at 100 to 150 DEG C to obtain a porous pole piece, wherein the porosity of the pole piece is 35 to 45 percent. The invention also provides a lithium ion battery containing the porous pole piece. The porous pole piece has higher porosity and further has higher liquid preserving capacity. The lithium ion battery containing the pole piece has higher multiplying power performance and higher cycling performance. Meanwhile, the formed pores are convenient for discharging gases, so that the service life of the battery is prolonged. According to the porous pole piece and the preparation method thereof and the lithium ion battery containing the porous pole piece, the preparation method is simple, the operation is simple and convenient, and the industrialized production can be realized.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a porous pole piece, a preparation method thereof, and a lithium ion battery comprising the porous pole piece. Background technique [0002] With the rapid development of society, the existing lithium-ion batteries are mainly developed in the direction of high rate. At present, the industry mainly reduces the diffusion path of lithium ions, increases the flow area, and improves the high-current charge and discharge performance of the battery through nano-materialization, porosity, reduction of the surface density of the pole piece, and end-face welding structure. However, with the nanometerization of materials, the process requirements are more stringent, and the processing performance requirements of materials are also significantly improved. The thin surface density requires higher precision of the coating machine and higher cost of end welding. Therefore, if t...

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): H01M4/139H01M4/13H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 刘艺钱龙饶睦敏
Owner OPTIMUM BATTERY CO LTD
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