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Coated positive electrode material capable of slowly releasing oxygen as well as preparation method and application of coated positive electrode material

A positive electrode material, coated technology, applied in the field of new energy, can solve the problems of battery cycle performance decline, positive plate impedance increase, etc., to achieve quantitative control, improve safety performance, and good electrochemical performance.

Active Publication Date: 2021-10-19
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of transition metal dichalcogenides will lead to an increase in the impedance of the positive electrode sheet and a decrease in battery cycle performance.

Method used

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  • Coated positive electrode material capable of slowly releasing oxygen as well as preparation method and application of coated positive electrode material
  • Coated positive electrode material capable of slowly releasing oxygen as well as preparation method and application of coated positive electrode material
  • Coated positive electrode material capable of slowly releasing oxygen as well as preparation method and application of coated positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a coated positive electrode material for slowing and decomposing oxygen, including a high-nickel positive electrode material and a zinc layer coated on the surface of the high-nickel positive electrode material; taking the coated positive electrode material as a whole, the mass of the zinc layer The content is 10000ppm.

[0055] This embodiment also provides a method for preparing the above-mentioned coated positive electrode material, including the following steps:

[0056] Grind and disperse coating agent zinc powder in ethanol, and vacuum dry at 80°C.

[0057] Add 1g of zinc powder and 99g of high-nickel cathode material to the mixing equipment for mixing, mixing time: 15min, rotation speed: 2000rpm. The coated material was treated at a high temperature of 450°C under an argon atmosphere for 8 hours, cooled, and the zinc powder was melted and cooled to form a continuous coating layer on the surface of the high-nickel positive electrode mater...

Embodiment 2

[0059] This embodiment provides a coated positive electrode material for slowing and decomposing oxygen, including a high-nickel positive electrode material and a tin layer coated on the surface of the high-nickel positive electrode material; taking the coated positive electrode material as a whole, the mass of the tin layer The content is 20000ppm.

[0060] This embodiment also provides a method for preparing the above-mentioned coated positive electrode material, including the following steps:

[0061] Grind and disperse the tin powder of the coating agent in ethanol, and dry it under vacuum at 80°C.

[0062] Add 2g of tin powder and 98g of high-nickel cathode material to the mixing equipment for mixing, mixing time: 20min, speed: 1500rpm. Treat the coated material at a high temperature of 270°C under a nitrogen atmosphere for 6 hours, and then cool it. After the tin powder is melted and cooled, a continuous coating layer is formed on the surface of the high-nickel positive...

Embodiment 3

[0064] This embodiment provides a coated positive electrode material for slowing and decomposing oxygen, including a high-nickel positive electrode material and a zinc layer coated on the surface of the high-nickel positive electrode material; taking the coated positive electrode material as a whole, the mass of the zinc layer The content is 500ppm.

[0065] This embodiment also provides a method for preparing the above-mentioned coated positive electrode material, including the following steps:

[0066] Grind and disperse coating agent zinc powder in ethanol, and vacuum dry at 80°C.

[0067]Add 0.05g of zinc powder and 99.95g of high-nickel cathode material to the mixing equipment for mixing, mixing time: 15min, speed: 2000rpm. The coated material was treated at a high temperature of 450°C under an argon atmosphere for 8 hours, cooled, and the zinc powder was melted and cooled to form a continuous coating layer on the surface of the high-nickel positive electrode material. T...

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Abstract

The invention discloses a coated positive electrode material capable of slowly releasing oxygen as well as a preparation method and application of the coated positive electrode material. The coated positive electrode material comprises a positive electrode active material and a metal layer coated on the surface of the positive electrode active material, the metal layer is formed by melting a metal simple substance, and the metal activity of the metal simple substance is stronger than that of hydrogen and weaker than that of magnesium. When the positive electrode material disclosed by the invention is applied to the lithium ion battery, an excellent slow release and oxygen release effect is shown, the safety performance of the battery is improved, and good electrochemical performance is also ensured.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to a coated positive electrode material for slowing and decomposing oxygen, a preparation method and application thereof. Background technique [0002] Lithium battery is the key to promote the next generation of sustainable energy technology, among which high energy density lithium ion battery has been paid more and more attention by researchers. Oxygen-containing cathodes are the main components of high-voltage, high-energy-density lithium-ion batteries. Since graphite is used as the anode in most commercial Li-ion batteries, the electrochemical performance of the battery, such as energy density and operating voltage, is determined by the choice of cathode material. [0003] In order to obtain lithium-ion batteries with high energy density, the current main technical route is to use high-nickel, high-voltage positive electrode materials, and the main problem brought about by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525H01M12/08C23C26/02
CPCH01M4/62H01M4/628H01M4/366H01M10/0525H01M12/08C23C26/02H01M2004/028Y02E60/10
Inventor 郑晓醒江卫军李子郯陈思贤许鑫培杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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