Preparation method of anode slurry of lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of easy agglomeration of CNTs and inability to disperse uniformly, and achieve the effects of uniform dispersion, improved conductivity, and simple methods

Active Publication Date: 2012-09-19
DONGGUAN AMPEREX TECH +1
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Problems solved by technology

[0009] The purpose of the present invention is to: aim at the deficiencies of the prior art, and provide a kind of preparation method that can obtain better CNT dispersion effect, an

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  • Preparation method of anode slurry of lithium ion battery
  • Preparation method of anode slurry of lithium ion battery
  • Preparation method of anode slurry of lithium ion battery

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Embodiment Construction

[0032] In order to make the object, technical solution and technical effect of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

[0033] The following is Embodiment 1 of the present invention. The formula of the positive electrode sheet is set as lithium cobaltate powder: CNT: polyvinylpyrrolidone (PVP): NMP = 96%: 2%: 2% (mass ratio). In the process of dry mixing, first add CNT and lithium cobaltate powder into the double-star mixer at a ratio of 1:5, and after 15 minutes of dry mixing, the mixed powder is obtained; then PVP and part of the solvent N-methylpyrrolidone (NMP) is added to the mixed powder for kneading and stirring, and the amount of solvent added is based on a solid conte...

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Abstract

The invention belongs to the technical field of manufacturing of lithium ion batteries and especially relates to a preparation method of anode slurry of a lithium ion battery. The preparation method comprises the following steps: 1) respectively weighting anode active materials, adhesives and conductive additive CNT powder in proportion; 2) mixing a part of anode active materials with all the conductive additive CNT powder, thereby obtaining mixed powder; 3) adding the adhesives and a part of solvent into the mixed powder; 4) kneading and stirring the mixture obtained in the step 3), thereby obtaining primary slurry; and 5) adding the remained solvent, the remained anode active materials and the remained adhesives into the primary slurry, and uniformly stirring, thereby obtaining the anode slurry. Compared with the prior art, the preparation method provided by the invention has the advantages that: the primary slurry is high in solid content in the kneading process, so that a huge mechanical force can be applied to the primary slurry by a stirring paddle; and meanwhile, the added anode active materials have a function of an abrasive material; and the force applied by a stirrer is finally applied to CNT aggregates, so that a better CNT scattering effect is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, and more specifically relates to a simple and easy preparation method for lithium-ion battery cathode slurry that can obtain better CNT dispersion effect. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high reliability, good processability and no environmental pollution, and have been widely used in various portable electronic devices (such as mobile phones, notebooks, MP4, etc.). [0003] A lithium-ion battery generally includes a positive pole piece, a negative pole piece, and a separator spaced between the positive pole piece and the negative pole piece. The positive electrode sheet includes a positive electrode collector and a positive electrode membrane coated on the positive electrode collector, and the negative electrode sheet includes a negative electrode collector and a negative electrode membrane coated on the ne...

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 郭超
Owner DONGGUAN AMPEREX TECH
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