Lithium-ion battery positive electrode slurry and preparation method thereof, pole piece lithium-ion battery

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of low equipment utilization, many dispersion steps, and increased agglomerates, so as to improve the quality of the slurry and reduce Agglomeration behavior, effect of increasing dissolution rate

Active Publication Date: 2019-11-05
SHENZHEN TOPBAND NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are obvious defects in the above two mixing methods.
The dry method is likely to lead to incomplete dissolution of the binder, resulting in poor colloid coating on the surface of lithium iron phosphate, and small steric hindrance, resulting in increased aggregates; although the wet method can avoid the phenomenon of incomplete dissolution of the binder, the dispersion step Many, the time is much longer, and the utilization rate of equipment is low

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  • Lithium-ion battery positive electrode slurry and preparation method thereof, pole piece lithium-ion battery

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preparation example Construction

[0024] Such as figure 1 As shown, a method for preparing a positive electrode slurry for a lithium ion battery according to an embodiment of the present invention includes the following steps:

[0025] S1. Mix the binder and the conductive agent at low speed to form a mixed powder.

[0026] Among them, the mixing of the binder and the conductive agent is preferably performed in a double planetary mixer. The low-speed rotation speed is 10-20 rpm / min. The mixing time can be 10-30 minutes.

[0027] The binder is one or more of polyvinylidene fluoride, polytetrafluoroethylene, acrylate, and polyurethane; the conductive agent is one or more of conductive carbon black, conductive graphite, and carbon fiber.

[0028] In order to mix the binder powder and the conductive agent powder uniformly in the shortest time, when adding, first add 50% (amount) of the binder, then add 100% (amount) of the conductive agent, and mix initially Then add the remaining 50% of the binder. The uniform mixing ...

Embodiment 1

[0048] Set each of the following to represent 1000g;

[0049] Take 3 parts of PVDF (polyvinylidene fluoride), 2 parts of Super-P (conductive carbon black), and 1 part of KS-6 (conductive graphite) and mix them uniformly for 20 minutes at 10 rpm in a mixer to form a mixed powder. After adding 69 parts of N-methylpyrrolidone, stirring at 20 rpm and dispersing at 1000 rpm for 90 minutes, the vacuum is increased to -0.095Mpa and the mixing is continued for 120 minutes to form a conductive glue liquid. Take 94 parts of lithium iron phosphate powder and add it to another mixer, and add 3 parts of N-methylpyrrolidone and mix uniformly for 20 minutes at 10 rpm to form a wet powder. Add 42 parts of conductive glue and mix for 120 minutes at a mixing speed of 25rpm, a dispersion speed of 1000rpm, and a vacuum of -0.095Mpa. Continue to add the remaining 33 parts of conductive glue solution and 31 parts of N-methylpyrrolidone at a stirring speed of 25rpm, a dispersion speed of 2500rpm, a va...

Embodiment 2

[0051] Set each of the following to represent 1000g;

[0052] 3 parts of PTFE (polytetrafluoroethylene) and 3 parts of conductive carbon black are uniformly mixed in a mixer at 10 rpm for 20 minutes to form a mixed powder. After adding 69 parts of N-methylpyrrolidone, stirring at 20 rpm and dispersing at 500 rpm for 90 minutes, the vacuum is increased to -0.095Mpa and the mixing is continued for 120 minutes to form a conductive glue liquid. Take 94 parts of lithium iron phosphate powder and add it to another mixer, and add 5 parts of N-methylpyrrolidone and mix uniformly for 20 minutes at 10 rpm to form a wet powder. Add 42 parts of conductive glue and mix for 120 minutes at a mixing speed of 25rpm, a dispersion speed of 1000rpm, and a vacuum of -0.095Mpa. Continue to add the remaining 33 parts of conductive glue solution and 31 parts of N-methylpyrrolidone at a stirring speed of 25rpm, a dispersion speed of 2500rpm, a vacuum of -0.095Mpa, and a mixing time of 60 minutes to form...

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Abstract

The invention discloses lithium ion battery anode slurry as well as a preparation method thereof, a pole piece and a lithium ion battery. The preparation method comprises the following steps: S1, mixing an adhesive and a conductive agent at low speed to form mixed powder; S2, adding a part of a solvent in the mixed powder, and mixing to form a conductive glue solution; S3, mixing lithium iron phosphate powder and a part of the solvent at low speed to form wet powder; S4, adding a part of the conductive glue solution in the wet powder, stirring at high speed under vacuum, and uniformly mixing to form slurry; and S5, adding the residual conductive glue solution and the residual solvent in the slurry, stirring at high speed under vacuum, and uniformly mixing to form lithium iron phosphate lithium ion battery anode slurry. Powder mixing of the conductive agent and the adhesive is carried out in advance, and then the solvent is added to carry out dispersion, so that the aggregation behavior of the adhesive during dissolution is reduced, the dissolution rate of the adhesive is increased, the conductive agent is also dispersed together at the same time, the mixing time is shortened, the efficiency is improved, and the quality of the prepared slurry is improved.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery positive electrode slurry and a preparation method thereof, a pole piece and a lithium ion battery. Background technique [0002] Lithium iron phosphate lithium-ion battery is one of the best-selling automotive power batteries on the market, and the prospect is very broad. The first step in the production of lithium iron phosphate batteries is slurry preparation, which is directly related to the product quality of the entire battery. At present, the mainstream lithium iron phosphate materials on the market are all nano-scale. Due to the small particle size, large surface area, and great surface energy of this material, it is easy to form agglomerates during production and processing, which affects the performance of the material. , Resulting in decreased battery performance. [0003] At present, the traditional mixing methods include dry met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/136H01M4/04H01M10/0525
CPCH01M4/04H01M4/136H01M4/1397H01M10/0525Y02E60/10
Inventor 赖真龙武永强
Owner SHENZHEN TOPBAND NEW ENERGY CO LTD
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