Preparation method of lithium ion battery carbon cathode material coating layer

A carbon anode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult to achieve consistency in polymerization, difficult to achieve mass production, poor safety, etc., to reduce coating costs, The effect of low cost and improved production efficiency
CN102610795AActive Publication Date: 2012-07-25NINGBO HONGYUAN CARBON IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NINGBO HONGYUAN CARBON IND
Publication Date
2012-07-25

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Abstract

The invention relates to a preparation method of a lithium ion battery carbon cathode material coating layer. The method is characterized by adopting a liquid-phase spray granulation method and comprising the following steps of: mixing carbon powder, polymer emulsion, stabilizer and water according to certain proportions to prepare slurry; feeding the slurry into a spray drying granulator for granulation coating; dispersing the slurry emulsion into droplets by an atomizer, wherein the droplets are in contact with the hot dry air to remove water and change into powdery particles so as to coat the surface of the carbon powder with polymer; and finally, placing the carbon powder coated with polymer in carbonization equipment, and performing carbonization treatment under the protection of nitrogen to obtain the required lithium ion battery carbon cathode material coating layer, wherein the carbonization temperature is 600-2,500 DEG C. The preparation method provided by the invention has the advantages of simple technology, easy polymerization and good safety, and can remarkably improve the production efficiency; and moreover, the preparation method has low cost and is suitable for batch production.
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Description

technical field

[0001] The invention belongs to the technical scope of preparation of negative electrode materials of lithium ion power batteries, in particular to a coating layer of carbon negative electrode materials of lithium ion batteries prepared by adopting a method of spray drying and granulation. Background technique

[0002] The negative electrode active material is the key factor that determines the performance of lithium-ion batteries. As the negative electrode active material of lithium-ion batteries, it must meet high gravimetric specific capacity and volume specific capacity, high lithium ion intercalation / extraction rate, and good cycle performance. It has good compatibility with the electrolyte, so the first cycle efficiency is high, the high and low temperature performance is excellent, the cost is low and the environment is friendly. At present, the mainstream of negative electrode active materials for lithium-ion batteries is graphitized carbon materials,...

Claims

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