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Production process and system of positive and negative electrode paste of lithium battery

A production process, positive and negative electrode technology, applied in the field of lithium battery positive and negative electrode slurry production process and system, can solve the problems of uneven contact between powder particles and binder, uneven mixing and dispersion of slurry, hard precipitation, etc. , to achieve the effects of increased productivity, reduced cost input, and improved dispersion

Active Publication Date: 2013-08-28
FOSHAN GOLD SILVER RIVER INTELLIGENT EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven mixing and dispersion of slurry made by vacuum planetary mixer and power mixer, uneven contact between powder particles and binder, easy delamination and hard precipitation, etc.

Method used

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  • Production process and system of positive and negative electrode paste of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] The production process for producing 500 kg of positive electrode slurry: lithium iron phosphate is added to the first-stage twin-screw extruder 1 through a quantitative continuous feeding device 102 at a flow rate of 311Kg / hour, and Ketjen carbon is passed through quantitatively at a flow rate of 7Kg / hour. The continuous feeding device 101 is added to the first-stage twin-screw extruder 1, nitrogen methyl pyrrolidone is added to the first-stage twin-screw extruder 1 through the quantitative continuous feeding device 104 at a flow rate of 91Kg / hour, and the positive electrode is obtained after being mixed. Basic material; then the positive electrode basic material is forcibly added to the second-stage twin-screw extruder, sheared and emulsified at a pressure of 2MPa, a shear rate of 10,000 times / min and a temperature of 40°C to obtain a positive primary product; Polyvinylidene fluoride and nitrogen methyl pyrrolidone are added to the second-stage twin-screw extruder thro...

Embodiment 2

[0126] The difference between this example and Example 1 is that lithium cobalt oxide is used instead of lithium iron phosphate, polyvinylidene fluoride and nitrogen methyl pyrrolidone mixture instead of nitrogen methyl pyrrolidone, under the pressure of 4MPa, the shear rate of 18000 times / min Production is carried out at a high speed and a temperature of 55° C., and the positive electrode slurry can be obtained after 1 hour of production.

Embodiment 3

[0128] The difference between this example and Example 1 is that lithium manganate is used instead of lithium iron phosphate, polyvinylidene fluoride and nitrogen methyl pyrrolidone instead of nitrogen methyl pyrrolidone, under 3MPa pressure, 19000 times / minute shear Speed ​​and temperature of 50 ° C for production, after 1 hour of production, the positive electrode slurry can be obtained.

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Abstract

The invention discloses a production process and a production system of positive and negative electrode paste of a lithium battery. Positive and negative electrode materials are added to a first-order twin-screw extruder through a conveying device; then the materials are added to a second-order twin-screw extruder so as to be shorn and emulsified, and the consistency processing is performed; and finally, the materials are vacuum-degassed, cooled and shorn to obtain the positive and negative electrode paste. The dispersion degree of lithium ions in the paste is increased, the quality and performance of the battery in the subsequent production is effectively improved, the productivity is increased, and the cost input is reduced.

Description

technical field [0001] The invention relates to the production of lithium batteries, in particular to a production process and system for positive and negative electrode slurry of lithium batteries. Background technique [0002] Lithium battery is a rechargeable battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Lithium batteries are widely used in consumer electronics products, military products, aviation products, etc., and become a mainstream battery. [0003] At present, the production of positive and negative electrode slurries for lithium batteries is produced by vacuum planetary mixers and power mixers. Mixing, dispersing, vacuum and other processes to obtain the finished slurry. Due to the uneven mixing and dispersion of the slurry made by the vacuum planetary mixer and the power mixer, the uneven contact between the powder particles and the binder, easy delamination and hard precipitation and other prob...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04
CPCY02E60/10
Inventor 张启发余淡贤梁可谭明明
Owner FOSHAN GOLD SILVER RIVER INTELLIGENT EQUIP CO LTD
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