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Electrode material surface coating method and application thereof

An electrode material and surface coating technology, which is applied in the fields of lithium ion batteries, electrode material preparation and lithium ion batteries, can solve the problems of limited application range, inability to form a coating layer, and reduction of the gram capacity of multi-materials.

Active Publication Date: 2016-09-28
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is conducive to the uniform coating of titanium oxide, titanium oxide tends to exist in the form of particles on the surface of the material and cannot form a complete coating layer. At the same time, this method uses a large amount of aqueous solution, which will cause the dissolution of manganese, resulting in The gram capacity of multi-component materials is reduced, and the scope of application is not wide

Method used

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  • Electrode material surface coating method and application thereof
  • Electrode material surface coating method and application thereof
  • Electrode material surface coating method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Combine water and multi-element cathode material LiNi 0.8 Co 0.15 Al 0.05 O 2 Mix at a mass ratio of 10:1, stir for 5 hours, centrifuge and dry to obtain LiNi after removing residual alkali 0.8 Co 0.15 Al 0.05 O 2 .

[0062] Take 10g LiOH·H 2 O and 1000g of LiNi after removing residual alkali 0.8 Co 0.15 Al 0.05 O 2 Pour into the mixer, mix at 1000r / min for 10min, weigh 5g TiO 2 Pour into the mixer and continue mixing at 1000r / min for 10 minutes; after mixing, take out the mixture and sinter at 500°C, during which oxygen is introduced at 6L / h, and after sintering for 3 hours, the temperature is increased to 800°C, and sintering is continued After 5h, it was cooled to room temperature, crushed and passed through a 200-mesh sieve to obtain a multi-element cathode material coated with Li-Ti-O oxide layer. The scanning electron microscope image of the multi-element cathode material coated with Li-Ti-O oxide layer is as follows figure 1 As shown, the Li-Ti-O oxide coating layer ...

Embodiment 2

[0064] Combine water and multi-element cathode material LiNi 0.85 Co 0.10 Al 0.05 O 2 Mix according to the mass ratio of 0.5:1, stir for 10h, centrifuge, and dry to obtain LiNi after removing residual alkali 0.85 Co 0.10 Al 0.05 O 2 .

[0065] Take 20g LiOH·H 2 O and 1000g of LiNi after removing residual alkali 0.85 Co 0.10 Al 0.05 O 2 Pour into the mixer, mix at 1000r / min for 5h, weigh 2g TiO 2 Pour into the mixer and continue mixing at 800r / min for 1h; after mixing, take out the mixture and sinter at 400℃, during which oxygen is injected at 20L / h. After sintering for 20h, increase the temperature to 1000℃ and continue sintering After 6 hours, it was cooled to room temperature, crushed and passed through a 200-mesh sieve to obtain a multi-element cathode material coated with Li-Ti-O oxide layer. The scanning electron microscope image of the multi-element cathode material coated with Li-Ti-O oxide is as follows figure 1 As shown, the Li-Ti-O oxide coating layer on the surface is o...

Embodiment 3

[0067] Combine water and multi-element cathode material LiNi 0.85 Co 0.10 Al 0.05 O 2 Mix at a mass ratio of 6:1, stir for 8h, centrifuge, and dry to obtain LiNi after removing residual alkali 0.85 Co 0.10 Al 0.05 O 2 .

[0068] Take 5g LiOH·H 2 O and 1000g of LiNi after removing residual alkali 0.85 Co 0.10 Al 0.05 O 2 Pour into the mixer, mix at 2000r / min for 15min, weigh 40g TiO 2 Pour into the mixer and continue mixing at 1500r / min for 10 minutes; after mixing, take out the mixture and sinter at 600°C. During the sintering process, 5L / h oxygen is introduced. After sintering for 2 hours, the temperature is increased to 700°C, and sintering is continued. After 30 hours, it was cooled to room temperature, crushed and passed through a 200-mesh sieve to obtain a multi-element cathode material coated with Li-Ti-O oxide layer. The scanning electron microscope image of the multi-element cathode material coated with Li-Ti-O oxide showed that the surface The Li-Ti-O oxide coating layer ...

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Abstract

The invention relates to an electrode material surface coating method and application thereof. The method includes the steps that an electrode material and lithium hydrate are mixed; then TiO2 and / or Al2O3 are added into the obtained mixture and continue to be mixed; the obtained mixture is sintered at the first temperature and heated to the second higher temperature to be sintered to obtain the electrode material coated with an oxide layer, wherein the second temperature is higher than or equal to the first temperature, and the first temperature is higher than or equal to 400 DEG C. The method is easy to operate and suitable for large-scale production, and a coating layer of a prepared product is complete and even. A battery made of the electrode material coated with the oxide layer is excellent in circulating performance and high temperature performance and good in safety performance, the 500-cycle capacity retention ratio at the normal temperature is 93.5% or more, and the 500-cycle capacity retention ratio at the high temperature is 89.2% or more.

Description

Technical field [0001] The invention belongs to the technical field of electrode material preparation and lithium ion batteries, and relates to a method for surface coating of electrode materials, an electrode material coated with an oxide layer prepared by the method, and an electrode material coated with the oxide layer Lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high discharge platform, long cycle life, and no memory effect. They have been widely used in mobile phones, cameras, and notebook computers. They have also begun to be used in power battery fields such as electric bicycles and electric vehicles. [0003] Lithium cobalt oxide cathode material is the first cathode material to be commercialized, but cobalt resources are limited, expensive, and polluting, which limits its further development. Multi-element cathode materials are becoming a substitute for lithium cobalt oxide due to low cost, low toxici...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/0471H01M4/366H01M4/485H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 张欣鹏杨顺毅任建国黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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