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A kind of dry coating method of lithium battery cathode material

A positive electrode material, dry coating technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low production efficiency, long process cycle, easy to damage coating layer, etc.

Active Publication Date: 2019-05-31
WUXI JEWEL POWER & MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this type of process are obvious: firstly, it is difficult for most coating materials to form a liquid phase, that is, there are fewer coatings to choose from in this method; secondly, in the process of firing after liquid phase coating, It is easy to damage the coating layer, causing defects in the coating; third, the coating process affects the performance of the material; fourth, the overall process cycle is long and the production efficiency is low

Method used

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  • A kind of dry coating method of lithium battery cathode material
  • A kind of dry coating method of lithium battery cathode material
  • A kind of dry coating method of lithium battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dry-coated alumina with lithium manganate material

[0019] S1. According to the weight ratio, take 2 parts of nano alumina powder (D50 about 1 micron) and 1 part of boric acid, put them together in a 10,000-turn high-speed pulverizer, pulverize for 10 seconds, and take them out for use;

[0020] S2. The semi-finished product of lithium manganate to be coated and the above-mentioned coating are put into the V-type mixer in proportion, and the weight ratio of the coating and the lithium manganate is 1:80, and the mixture is uniform;

[0021] S3. In order to ensure the coating uniformity and effect, add polyurethane balls to the mixture, and mix at low speed for more than 2 hours under the condition that the weight ratio of the balls is 1:3;

[0022] S4. The mixed material is fired, and the firing process parameters are: heating to 850°C for 10 hours, cooling to complete the coating, and the temperature involved in the firing process parameters can fluctuate up and down b...

Embodiment 2

[0026] Dry Coating of Titanium Dioxide with Nickel Cobalt Lithium Manganate

[0027] S1. According to the weight ratio, take 3 parts of nano titanium dioxide (D50 about 1 micron) and 1 part of boric acid, put them together in a 10,000-turn high-speed pulverizer, pulverize for 5 seconds, and take them out for use;

[0028] S2. The semi-finished nickel-cobalt lithium manganate to be coated and the above-mentioned coating are put into the high-speed mixer in proportion, and the weight ratio of the coating to the nickel-cobalt lithium manganate is 1:100, and the high speed (1400 rpm) is turned on. Mix for 15 minutes;

[0029] S3. The mixed material is fired, and the firing process parameters are: heating to 800° C. for 8 hours, cooling, and completing the coating. The temperature involved in the firing process parameters can fluctuate up and down by 10%;

[0030] S4. Put the material that has completed the coating process into the high-speed mixer, turn on the high-speed (1400 rp...

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Abstract

The invention belongs to the technical field of lithium-ion battery materials and particularly relates to a dry coating method of a positive electrode material for a lithium battery. The method comprises the steps of carrying out mixing treatment on a coating and boric acid, mixing with a positive electrode material and firing to obtain a finished product of the positive electrode material. According to the method, the required coating material and a contact agent form a solid solution, the coating material is easy to coat uniformly and is tight in combination after being fired; a coating layer is not easy to fall off. According to the method, the production period is shortened, the coating uniformity is ensured, the coating material can be treated at a high temperature to form ideal glassy state coating, and the performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a dry coating method for a positive electrode material of a lithium battery. Background technique [0002] The cathode material of lithium ion battery is an important raw material of lithium secondary battery. The main technical problem that restricts its application in power lithium ion battery is its unsatisfactory high temperature cycle life. The coating process can alleviate and solve most of the problems of cathode materials. [0003] The traditional coating process is mainly liquid-phase coating, that is, after the cathode material is fired, it is coated with a liquid-phase coating material, and then dried or simply refired to stabilize the coating on the surface of the material. The disadvantages of this type of process are obvious: first, it is difficult for most cladding materials to form a liquid phase, that is, there are fewer claddin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 马岩华赵春阳唐朝辉
Owner WUXI JEWEL POWER & MATERIALS
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