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Repairing material and repairing method of sagger for producing lithium ion battery positive electrode material

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of repairing materials for saggars used in the production of positive electrode materials for lithium ion batteries, can solve the problems of damage to the microstructure of the saggar, shortened service life of the saggar, poor corrosion resistance, and the like, and achieves cost reduction , the effect of improving service life and reducing production costs

Pending Publication Date: 2021-03-23
HEFEI RONGJIE ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main material of the sagger used for the positive electrode material of lithium ion battery is silica and alumina composite material, which has the problem of poor corrosion resistance. Strong penetration ability. Lithium sources such as lithium carbonate and lithium hydroxide are strongly alkaline substances, which exist in a semi-liquid or liquid state during high-temperature sintering. They are highly corrosive to sagger materials and will cause aluminum in the sagger , silicon, sodium, magnesium, and other ions are precipitated, which not only destroys the microstructure of the sagger, but also erodes the sagger, which significantly shortens the service life of the sagger, and introduces impurity elements into the positive electrode material
At the same time, a large number of discarded saggers have brought great pressure to the environment and related enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, select the saggar with slight peeling from the lithium-ion battery cathode material production line, record the number of times it has been used, and clean up the residual anode material attached to the sagger, and then weigh 35% of alumina powder, 20% of quartz powder, Titanium dioxide 3%, tungsten carbide powder 5%, lithium fluoride 5%, silicone resin 10%, polyvinyl alcohol 2%, deionized water 20%, mix in proportion and stir evenly to obtain repair slurry; Brush the cleaned saggers with good repair slurry for 3 times, and after drying naturally, place them in a production kiln at 900°C for sintering for 20 hours.

[0021] In order to verify the effect, the sagger repaired by this patent method will be verified by charging and sintering, and the verification will be carried out on the lithium cobalt oxide production line of the positive electrode material of lithium ion battery. It is a mixed material composed of 2:1, sintered at 1040°C for 10 hours, recorded th...

Embodiment 2

[0023] First, select the saggar with slight peeling from the lithium-ion battery positive electrode material production line, record the number of times it has been used, and clean the active materials attached to the sagger, and then weigh 40% of alumina powder and 20% of quartz powder according to the mass percentage. %, titanium dioxide 3%, tungsten carbide powder 5%, sintering aid 5%, silicone resin 10%, polyvinyl alcohol 2%, deionized water 15%, mixed in proportion and stirred evenly to obtain repair slurry; will use The above-mentioned repair slurry prepared above is brushed on the above-mentioned cleaned sagger for 3 times, after being dried naturally, it is placed in a production kiln at 900°C for sintering for 25 hours.

[0024] In order to verify the effect, the charging and sintering verification will be carried out after the repair according to this patent method, and the verification will be carried out on the lithium cobalt oxide production line of the positive el...

Embodiment 3

[0026] First, select the saggar with slight peeling from the lithium-ion battery positive electrode material production line, record the number of times it has been used, and clean up the active materials attached to the sagger, and then weigh 45% of alumina powder and 15% of quartz powder according to the mass percentage. %, titanium dioxide 3%, tungsten carbide powder 5%, sintering aid 5%, silicone resin 10%, polyvinyl alcohol 2%, deionized water 15%, mixed in proportion and stirred evenly to obtain repair slurry; will use The above-mentioned prepared restoration slurry is brushed on the above-mentioned cleaned sagger for 3 times, after natural drying, it is placed in a production kiln at 900°C for sintering for 20 hours.

[0027] In order to verify the effect, the sagger repaired by this patent method will be verified by charging and sintering, and the verification will be carried out on the lithium cobalt oxide production line of the positive electrode material of lithium i...

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Abstract

The invention discloses a repairing material of a sagger for producing a lithium ion battery positive electrode material. The repairing material is prepared by drying and sintering repairing slurry, wherein the repairing slurry is prepared from the following components in percentage by mass: 30-50% of alumina powder, 20-30% of quartz powder, 3-5% of titanium dioxide, 5-15% of tungsten carbide powder, 2-5% of a sintering aid, 5-20% of a coalescing agent, 1-5% of a dispersing agent and 10-30% of a solvent. The invention further discloses a method for repairing the sagger for producing the positive electrode material of the lithium ion battery by utilizing the repairing material. By coating the inner wall of the sagger with the repairing material, the service life of the sagger can be remarkably prolonged, sagger slag introduction is reduced, the sagger cost is reduced, and the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery production equipment, and in particular relates to a repair material and a repair method for a sagger used in the production of lithium-ion battery cathode materials. Background technique [0002] Lithium-ion batteries are widely used in 3C, power tools, energy storage and other fields due to their high specific energy density, fast charging and discharging capabilities, and long cycle life. With the rapid development of lithium-ion battery applications, the demand for lithium-ion batteries is growing rapidly. Cathode materials account for more than 30% of the total cost of lithium-ion batteries, and the performance of cathode materials directly affects the performance indicators of lithium-ion batteries, so cathode materials occupy a core position in lithium-ion batteries. Therefore, in the industrial production of positive electrode active materials, higher and higher requirements a...

Claims

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Application Information

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IPC IPC(8): C04B41/87F27D5/00
CPCC04B41/87C04B41/5057F27D5/0012F27M2003/04C04B41/5041C04B41/5035C04B41/5031C04B41/4539C04B41/0072
Inventor 徐从胜戴吴月朱二涛胡刚刚吴胜坤李刚
Owner HEFEI RONGJIE ENERGY MATERIALS CO LTD
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