Preparation method of silicon-carbon negative electrode slurry, silicon-carbon negative electrode plate and lithium battery

A technology of negative electrode slurry and silicon carbon, which is applied in the preparation of silicon carbon negative electrode, silicon carbon negative electrode slurry, silicon carbon negative electrode and lithium battery, which can solve the problems of difficult mixing evenly, electrode powder dropping, and long homogenization time To achieve the effect of improving the peeling force, reducing the powder dropping rate and saving the homogenization time

Pending Publication Date: 2022-04-15
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, the negative electrode sheet prepared in this way has the following disadvantages: (1) it is difficult to mix the graphite material and the silicon carbon material evenly; The binder does not have good adhesion to silicon carbon materials; (3) The traditional homogenization process takes about 7 hours, which takes a long time and consumes a lot of energy
[0005] In the preparation process of the existing silicon carbon pole piece, it is difficult to mix the materials, the homogenization takes a long time, the energy consumption is high, and the phenomenon of powder removal of the pole piece is easy to occur. Inhomogeneous, the method of chip powder drop is very necessary

Method used

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  • Preparation method of silicon-carbon negative electrode slurry, silicon-carbon negative electrode plate and lithium battery
  • Preparation method of silicon-carbon negative electrode slurry, silicon-carbon negative electrode plate and lithium battery
  • Preparation method of silicon-carbon negative electrode slurry, silicon-carbon negative electrode plate and lithium battery

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preparation example Construction

[0061] In a specific embodiment, the present invention provides a method for preparing a silicon-carbon negative electrode slurry, which specifically includes the following steps:

[0062] (1) Mix and stir graphite particles and conductive agent at a revolution speed of 8-12rpm and a dispersion speed of 480-520rpm for 12-18min to obtain the first mixed powder, wherein the conductive agent includes Super-P, acetylene black, graphene, conductive Any one or a combination of at least two of carbon black, conductive graphite or carbon nanotubes;

[0063] (2) Add silicon carbon powder and part of sodium carboxymethyl cellulose to the first mixed powder in step (1), and carry out the first step for 12 to 18 minutes at a revolution speed of 8 to 12 rpm and a dispersion speed of 480 to 520 rpm. Stir to obtain the second mixed powder, the mass ratio of the silicon carbon powder and the negative electrode active material in the second mixed powder is (78~88):(12~22), then the remaining s...

Embodiment 1

[0070] A silicon carbon negative electrode sheet is provided in this embodiment, such as figure 1 Shown, its preparation method specifically comprises the following steps:

[0071] (1) Graphite particles and Super-P powder were mixed and stirred for 15 minutes at a revolution speed of 10 rpm and a dispersion speed of 500 rpm to obtain the first mixed powder;

[0072] (2) Add silicon carbon powder and sodium carboxymethylcellulose powder accounting for 50% of the total mass of sodium carboxymethylcellulose (CMC) in the first mixed powder of step (1), and be 10rpm with revolution speed, Dispersion speed is 500rpm and carries out the first stirring of 15min, obtains the second mixed powder, the mass ratio of silicon carbon powder and graphite particle in the second mixed powder is 85:15, then remaining 50% sodium carboxymethyl cellulose The powder is sprayed into the second mixed powder at a speed of 1L / min, and pure water is sprayed into the second mixed powder at a flow rate o...

Embodiment 2

[0075] This embodiment provides a silicon carbon negative electrode sheet, and its preparation method specifically includes the following steps:

[0076] (1) Graphite particles and acetylene black powder were mixed and stirred for 12 minutes at a revolution speed of 8 rpm and a dispersion speed of 480 pm to obtain the first mixed powder;

[0077] (2) Add silicon carbon powder and sodium carboxymethylcellulose powder accounting for 35% of the total mass of sodium carboxymethylcellulose (CMC) in the first mixed powder of step (1), and be 8rpm with revolution speed, Dispersion speed was 480rpm and carried out the first stirring for 12min to obtain the second mixed powder, the mass ratio of silicon carbon powder and graphite particles in the second mixed powder was 78:22, and then the remaining sodium carboxymethyl cellulose was mixed with 0.8L The speed of / min is sprayed into the second mixed powder, and pure water is sprayed into the second mixed powder at the flow rate of 0.8L...

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Abstract

The invention provides a preparation method of silicon-carbon negative electrode slurry, a silicon-carbon negative electrode plate and a lithium battery. The preparation method comprises the following steps: (1) mixing and stirring a negative electrode active material and a conductive agent to obtain first mixed powder; (2) adding silicon carbon powder into the first mixed powder obtained in the step (1), mixing with part of sodium carboxymethyl cellulose to obtain second mixed powder, and adding the rest of sodium carboxymethyl cellulose and a solvent into the second mixed powder to obtain intermediate slurry; and (3) adding a polytetrafluoroethylene emulsion into the intermediate slurry obtained in the step (2), and uniformly mixing to obtain the silicon-carbon negative electrode slurry. According to the invention, the components in the silicon-carbon negative electrode slurry are uniformly dispersed, the slurry homogenizing time is saved, the powder falling rate of the silicon-carbon negative electrode plate is reduced, and the stripping force of the silicon-carbon negative electrode plate is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a silicon-carbon negative electrode sheet, in particular to a preparation method of a silicon-carbon negative electrode slurry, a silicon-carbon negative electrode sheet and a lithium battery. Background technique [0002] At present, domestic and foreign demands for increasing the energy density of lithium-ion batteries are getting closer and closer. The usual methods are to supplement lithium with the negative electrode sheet, develop new negative electrode materials with high energy density, and develop new electrolytes. Among them, the new negative electrode materials, such as silicon carbon negative electrode materials, are prepared by conventional double planetary stirring. However, the negative electrode sheet prepared in this way has the following disadvantages: (1) it is difficult to mix the graphite material and the silicon carbon material evenly; The binder does not h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/36H01M4/38H01M10/052
Inventor 方杰雄
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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