Preparation process of lithium ion oil slurry without glue and oily electrode slurry

A preparation process and lithium ion technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of glue liquid easily adhering to the wall of the pipeline, difficult to clean, and the pipeline is not smooth, so as to improve the production capacity of equipment and equipment. Utilization rate, simplifying process operation steps, improving the effect of automation

CN109546074AInactive Publication Date: 2019-03-29福建冠城瑞闽新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-03-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of a lithium ion cell and particularly relates to a preparation process of the lithium ion oil slurry without glue and an oily electrode slurry. The methodcomprises steps that an active material, a conductive agent and a binder are dry-mixed and stirred to form a mixed powder having the solid content of 90-80%; a conductive slurry and a solvent are added to the mixed powder and then stirred to obtain the slurry having the solid content of 80-70%; after a solvent is added to the mixed powder, the slurry having the solid content of 70-60% is obtainedafter stirring; a solvent is further added to the slurry and is then stirred; a revolutionary paddle is made to rotate in reverse to remove all the bubbles to the surface of the slurry; the slurry isfiltered and discharged. The method is advantaged in that operation is simple, the method is suitable for an automatic feeding system, the whole mixing time can be controlled within 3.5-7 hours according to difference of main materials, the utilization rate of equipment is improved, and performance of the slurry is made to be more uniform and more stable.
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Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation process of lithium ion oily slurry without glue. Background technique

[0002] As we all know, the mixing process is the most critical process in the manufacturing process of lithium-ion batteries, and plays a vital role in the performance of lithium-ion batteries. Especially for power batteries, the service life required for the battery is more than ten years, and it may be used alternately in very cold or very hot environments, which affects the high and low temperature performance, rate performance, and durability of the battery. Safety and security pose very stringent requirements.

[0003] The performance of the battery depends mainly on the quality of the battery pole pieces. However, the quality of the pole piece mainly depends on the quality of the pole piece when it is coated. The coating quality of pole pieces, on the one hand, has a certa...

Examples

Embodiment 1

[0059] S1, after baking and dehydrating graphite, carbon black, and polytetrafluoroethylene according to the solid content, use a slurry mixer to stir at a revolution speed of 5 RPM and a rotation speed of 25 RPM for 60 minutes to form a mixed powder with a solid content of 90%. ;

[0060] S2, adding tetrahydrofuran and conductive paste with a solid content of 20% to the mixed powder and stirring with a slurry mixer mixer at a revolution speed of 15RPM and an autorotation speed of 25RPM for 60min to obtain a slurry with a solid content of 70% ;

[0061] S3, adding tetrahydrofuran with a solid content of 20% to the slurry of S2, and using a slurry mixing mixer to stir at a revolution speed of 5 RPM and an auto rotation speed of 1500 RPM for 30 minutes;

[0062] S4, add tetrahydrofuran with a solid content of 15% to the S3 slurry, and then use a slurry mixing mixer to stir at a revolution speed of 5 RPM and an auto rotation speed of 1500 RPM for 60 minutes for stirring;

[006...

Embodiment 2

[0067] S1, bake and dehydrate coke, conductive graphite, and polyvinylidene fluoride according to the solid content, and then stir with a slurry mixer mixer at a revolution speed of 15 RPM and an auto rotation speed of 100 RPM for 120 minutes to form a mixed powder with a solid content of 90%. ;

[0068] S2, adding N-methylpyrrolidone and conductive paste with a solid content of 40% to the mixed powder, using a slurry mixer to stir at a revolution speed of 5 RPM and a rotation speed of 100 RPM for 120 minutes to obtain a solid content of 60%. the slurry;

[0069] S3, then add N-methylpyrrolidone with a solid content of 20% to the S2 slurry, and then use a slurry mixer to stir at a revolution speed of 15RPM and an autorotation speed of 1500RPM for 60min;

[0070] S4, add N-methylpyrrolidone with a solid content of 45% to the S3 slurry, and then use a slurry mixing mixer to stir at a revolution speed of 35RPM and an autorotation speed of 3500RPM for 120min for stirring;

[007...

Embodiment 3

[0075] S1, after baking and dehydrating fiber carbon, carbon nanotubes, and polyvinylidene fluoride according to the solid content, use a slurry mixer to stir at a revolution speed of 10 RPM and an auto rotation speed of 50 RPM for 120 minutes to form a mixed powder with a solid content of 85%. ;

[0076] S2, adding N-methylpyrrolidone and conductive paste with a solid content of 30% to the mixed powder, using a slurry mixer to stir at a revolution speed of 10RPM and a rotation speed of 50RPM for 90min to obtain a 65% slurry material;

[0077] S3, adding N-methylpyrrolidone with a solid content of 30% to the S2 slurry, and then stirring at a revolution speed of 10RPM and an autorotation speed of 1500RPM for 60min;

[0078] S4, add N-methylpyrrolidone with a solid content of 45% to the S3 slurry, and then use a slurry mixing mixer to stir at a revolution speed of 20RPM and an autorotation speed of 2500RPM for 90min;

[0079] S5, use the slurry mixing mixer to reversely rotate...