Lithium ion battery slurry, preparation method of the lithium ion battery slurry, and lithium ion battery

Abstract

The invention discloses a preparation method of lithium ion battery slurry. The preparation method comprises the following steps of 1, preparing a glue solution having a concentration of 3 to 7% by an adhesive, 2, putting one or more active substances and one or more conducting additives into a three-arm planetary stirrer, and uniformly mixing the mixture into powder at a low speed, 3, adding 1 to 15% of a solvent into the powder obtained by the step 2, and uniformly mixing the mixture into wet powder at a low speed, wherein a ratio of the total mass of the solvent to the mass of the powder is in a range of (55: 4) to (50: 50), 4, adding 20 to 50% of the glue solution and the rest of the solvent into the wet powder, and uniformly mixing at a high speed, and 5, adding the rest of the glue solution into the mixture obtained by the step 4, uniformly stirring at a low speed for 5 to 10 minutes, and then stirring at a high speed for 2 to 5 hours to obtain the lithium ion battery slurry. The invention also discloses the lithium ion battery slurry and a battery pole piece prepared by the preparation method, and a lithium ion battery.

Description

【Technical field】 [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for preparing lithium-ion battery slurry, the lithium-ion battery slurry prepared by the method, and battery pole pieces and lithium-ion batteries using the lithium-ion battery slurry. 【Background technique】 [0002] In the manufacturing process of lithium-ion batteries, mixing materials is a very important step. The quality of the slurry obtained from mixing materials will directly affect the performance of the finished battery. There are two traditional mixing methods, one is to mix the active material, binder, solvent, conductive agent, etc. according to a certain ratio, and then stir in a mixer at a certain stirring rate to prepare the required slurry; A mixing method is to add active material, binder, solvent, conductive agent, etc. in batches according to a certain proportion and stir during the mixing process to prepare the required slurry. [0003] However...

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Problems solved by technology

[0003] However, during the stirring process of the above two methods, powders such as active materials and conductive agents can easily form "ash bags" and disperse in the slurry, resulting in uneven mixing of the slurry, making the electrode pad dressing after pulling the slurry Inhomogeneous, with localized "bumps" and bubble "spots" on the drawn electrode pads

Local "bulges" will lead to preferential reaction points in the battery during charging and discharging, and even puncture the separator to cause a short circuit of the battery, which will become a safety hazard of the battery; bubble "spots" will reduce the utilization rate of active materials. affect the capacity of the battery

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