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Lithium ion battery positive electrode slurry and preparation method thereof

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as gel, achieve simple process routes, good dispersibility, and alleviate supply shortages

Active Publication Date: 2022-03-22
WUHU ETC BATTERY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide lithium-ion battery positive electrode slurry and its preparation method. By using two PVDF binders in combination, the design of the stirring process can not only improve the uniform dispersion of lithium-ion battery positive electrode slurry, but also ensure the stability of the slurry The performance has been greatly improved, and the problem of positive electrode slurry gel has been solved

Method used

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  • Lithium ion battery positive electrode slurry and preparation method thereof
  • Lithium ion battery positive electrode slurry and preparation method thereof
  • Lithium ion battery positive electrode slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of lithium ion battery cathode slurry, comprises the following steps:

[0042] 1) Weigh 97 parts by mass of positive active material lithium iron phosphate, 1 part of conductive carbon black powder, and 2 parts of binder. The binder is PVDF1 modified by mass ratio containing hexafluoropropylene group: PVDF2 of model HSV900 =5:5, add lithium iron phosphate, conductive carbon black powder and binder into a double planetary mixing tank for dry mixing, the dispersion revolution speed is 20rpm, the rotation speed is 500rpm, and the dispersion time is 30min;

[0043] 2) Add N-methylpyrrolidone NMP for pre-dispersion, the dispersion revolution speed is 10rpm, the rotation speed is 200rpm, and the dispersion time is 30min to form a semi-dry powder slurry with a solid content of 73% (mass percentage);

[0044] 3) Then add NMP to disperse, the dispersion revolution speed is 20rpm, the rotation speed is 500rpm, the dispersion time is 60min, and the solid con...

Embodiment 2

[0049] The preparation method of lithium ion battery cathode slurry, comprises the following steps:

[0050]1) Take by weight 97 parts of positive electrode active material lithium iron phosphate, 1 part of conductive carbon black powder, and 2 parts of binder; = 4:6 composition, adding lithium iron phosphate, conductive carbon black powder, and binder into a double planetary mixing tank for dry mixing, the dispersion revolution speed is 30rpm, the rotation speed is 800rpm, and the dispersion time is 45min;

[0051] 2) Add NMP for pre-dispersion, the dispersion revolution speed is 10rpm, the rotation speed is 200rpm, and the dispersion time is 30min to form a semi-dry powdery slurry with a solid content of 72% (mass percentage);

[0052] 3) Then add NMP to disperse, the dispersion revolution speed is 20rpm, the rotation speed is 500rpm, the dispersion time is 60min, the solid content is reduced to 67%, and a plasticine-like slurry is formed;

[0053] 4) Then add NMP for dispe...

Embodiment 3

[0057] The preparation method of lithium ion battery cathode slurry, comprises the following steps:

[0058] 1) Take by weight 97 parts of positive electrode active material lithium iron phosphate, 1 part of conductive carbon black powder, and 2 parts of binder, and the binder is composed of PVDF1 containing hexafluoropropylene group by mass ratio: PVDF2 of model HSV900 =3:7, add lithium iron phosphate, conductive carbon black powder, and binder into a double planetary mixing tank for dry mixing, the dispersion revolution speed is 30rpm, the rotation speed is 600rpm, and the dispersion time is 35min;

[0059] 2) After step 1), add NMP for pre-dispersion, the dispersion revolution speed is 10rpm, the rotation speed is 200rpm, and the dispersion time is 30min, forming a semi-dry powdery slurry with a solid content of 70% (mass percentage);

[0060] 3) Add NMP for dispersion, the dispersion revolution speed is 20rpm, the rotation speed is 500rpm, the dispersion time is 60min, and...

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Abstract

According to the lithium ion battery positive electrode slurry and the preparation method thereof, two PVDF binders are matched for use, the stirring process is further optimized on the basis of traditional dry method stirring, one-step pre-dispersion and two-step high-low speed dispersion are added on the basis of a dry method, the states of pre-dispersion and low-speed dispersion slurry are controlled, and the delivery viscosity is controlled; the dispersion uniformity of the lithium ion battery positive electrode slurry can be improved, and meanwhile, the stability of the slurry can be greatly improved. The process route is simple and easy to implement, the gel problem caused by interaction of domestic PVDF and a positive electrode main material in use is delayed or solved, meanwhile, it is guaranteed that the slurry has long-time stability and moderate viscosity, and the problems that the slurry is weak in shipment sieving capacity, prone to settling and blocking a filter element, hard spots exist in coating and the like are solved. Meanwhile, the supply tension of imported raw materials is relieved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of new energy batteries, and in particular relates to a positive electrode slurry of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery pulping is at the first stage of the whole process, and the performance of the slurry directly affects the subsequent process, which in turn affects the performance of lithium-ion batteries. The positive electrode of lithium-ion batteries is mainly based on polyvinylidene fluoride (PVDF) oil-soluble binder, and polyvinylidene fluoride is currently the most widely used lithium battery positive electrode binder, accounting for more than 90%. [0003] At present, with the rapid development of electric vehicles and the structural impact of the iron-lithium market, the supply gap continues to expand, and product prices continue to rise. The currently produced positive electrode slurry has the problem of slurry gel. Contents of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/623H01M10/0525Y02E60/10
Inventor 冯艳张黎蔡小平张文衡晏子聪窦元运
Owner WUHU ETC BATTERY LTD
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