A kind of thick electrode material and preparation method thereof, lithium ion battery
A technology for lithium-ion batteries and electrode materials, which is applied in electrode manufacturing, electrode rolling/calendering, electrode collector coating, etc., can solve the problems that thick electrodes cannot exert effective value, high technical difficulty, complex process, etc., and achieve Guarantee consistency, simple manufacturing process, and solve the effect that is difficult to infiltrate
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[0018] An embodiment of the present invention provides a method for preparing a thick electrode material, including:
[0019] Adding a conductive agent, a thickener, a binder and a solvent to the electrode active material with a small particle size to form a first electrode slurry;
[0020] Adding a conductive agent, a thickener, a binder and a solvent to the electrode active material with a large particle size to configure a second electrode slurry;
[0021] The first electrode slurry and the second electrode slurry are respectively conveyed to the respective corresponding dies of the double-die coating machine through two sets of slurry transport systems for simultaneous coating of an even number of times, and the first electrode slurry is kept at The top of the second electrode slurry or the second electrode slurry on the top of the first electrode slurry, after drying and rolling treatment, it can be obtained as follows: figure 1 Schematic diagram of the structure of the ...
Embodiment 1
[0048] 1) Configure the first negative electrode slurry: use a graphite material with a particle size D50 of 8um, its content is 96%, the conductive agent is Super-P, the content is 0.5%, the thickener is sodium carboxymethyl cellulose, and the content is 1.5% , the binder is SBR content of 2%, plus deionized water, configured as the first negative electrode slurry with a solid content of 50% and a viscosity of 3500mPa.S.
[0049] 2) Configure the second negative electrode slurry: use a graphite material with a particle size D50 of 15um, its content is 96%, the conductive agent is Super-P, the content is 0.5%, the thickener is sodium carboxymethyl cellulose, and the content is 1.5% , the binder is SBR content of 2%, and deionized water is added to configure the second negative electrode slurry with a solid content of 50% and a viscosity of 3800mPa.S.
[0050] 3) The first negative electrode slurry and the second negative electrode slurry are respectively transported to the res...
Embodiment 2
[0055] The first negative electrode slurry and the second negative electrode slurry obtained in Example 1 were transported to the respective corresponding dies of the double-die coating machine through two sets of slurry transport systems. When coating, the first negative electrode slurry and the second negative electrode slurry are coated in gaps at the same time to form a complete coating surface. The coating gap is 10mm, and the width of the coating stripes of the first negative electrode slurry and the second negative electrode slurry is the same, and the width is 10mm. , the thickness is 25um. The pole piece after one coating and drying is coated again on it, and the second negative electrode slurry is kept above the first negative electrode slurry, and the thickness of the coating is also 25um. It is coated 4 times in total, and the total thickness of one side is 100um.
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