Roll sticking prevention lithium battery cathode material and preparation method thereof

Abstract

The invention provides a roll sticking prevention lithium battery cathode material and a preparation method thereof. The cathode material is prepared by the following raw materials of, by weight, 50-96 parts of carbon powder, 0.5 part of a conductive agent, 0.6-2.0 parts of a thickening agent, 2.0-3.0 parts of an adhesive, 5-10 parts of an oiliness agent and a proper amount of deionized water. The preparation method comprises the following steps of a. weighing the carbon powder, the conductive agent, the thickening agent, the an adhesive, the oiliness agent and the deionized water according to the above weight parts; b. adding the thickening agent into the proper amount of the deionized water, stirring for 3-5 hours with a high speed, standing for 3-5 hours to prepare a thickening agent aqueous solution with a solid content being 1.0791%-2.5% by mass; c. adding the conductive agent, stirring for 0.8-1.2 hours with a high speed; d. adding the oiliness agent, stirring for 0.8-1.2 hours with a high speed; e. adding the adhesive, stirring for 0.8-1.2 hours with a high speed; f. adding the carbon powder in four times, adding half the amount for the first time, and adding a half of the left amount for the subsequent time, stirring for 8-12 minutes with a low speed after the addition of each time to make the carbon powder moist enough; and g. stirring for 3-5 hours with a high speed, vacuum-pumping and stirring uniformly at a low speed to obtain the roll sticking prevention lithium battery cathode material.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a lithium battery negative electrode material and a preparation method of the negative electrode material. Background technique [0002] At present, the production process of lithium battery negative electrode is briefly introduced. Since the current lithium battery negative electrode material is prepared from the following raw materials: carbon powder, conductive agent, CMC sodium carboxymethyl cellulose, SBR polyvinyl chloride and deionized water. This formula is a water-based process. The content of CMC sodium carboxymethyl cellulose is 2.0%. As a thickener, the solid content of the slurry is 36%, and the ionized water is 64%. The slurry is very thin. The temperature during coating If the setting is high and the coating speed is slow, the electrode sheet can be dried. At the same time, during the long period of operation of this process, the negative electrode slu...

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Problems solved by technology

This formula is a water-based process. The content of CMC sodium carboxymethyl cellulose is 2.0%. As a thickener, the solid content of the slurry is 36%, and the ionized water is 64%. The slurry is very thin. The temperature during coating If the setting is high and the coating speed is slow, the electrode sheet can be dried. At the same time, during the long period of operation of this process, the negative electrode slurry is seriously stuck to the roll in the roll-to-roll process, resulting in more waste products. During the rolling process, at least two employees need to wipe the roll with alcohol continuously to make the production continue. The thickness of the counter roll is 0.125mm, which does not meet the process requirement of 0.115mm, so that the compaction density of the negative electrode can only reach 1.38 g / cm3, not up to the 1.50g / cm3 required by the process

This process wastes a lot of water in the batching workshop due to the low solid content; in the coating workshop, the temperature is high and the speed is slow, wasting energy and time; Waste, two employees need to keep rubbing the rollers, wasting manpower, the thickness of the rollers does not meet the process requirements, then the post-process assembly workshop, when the battery cells are inserted into the shell, it is difficult to enter the shell, the battery shell is bulging, and the battery is scrapped