Composite positive electrode material and preparation method thereof

A technology of composite positive electrode material and positive electrode material, which is applied in the field of composite positive electrode material and its preparation, can solve the problems of poor bonding force between the coating layer and the material matrix, the overall performance of the battery is not ideal, and the side reactions are serious, etc., and achieve long-term cycle stability. and electrochemical performance, rapid mass production, and improved binding effect

Pending Publication Date: 2022-07-29
贝特瑞(江苏)新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a composite positive electrode material and its preparation method to solve the problem of cumbersome steps, serious side reactions, unsatisfactory overall performance of the battery, and the combination of the coating layer and the material matrix in the existing method of constructing a coating layer on the surface of the positive electrode material. Poor strength and other issues

Method used

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  • Composite positive electrode material and preparation method thereof
  • Composite positive electrode material and preparation method thereof
  • Composite positive electrode material and preparation method thereof

Examples

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preparation example Construction

[0081] In a second aspect, the present application also provides a method for preparing a composite positive electrode material, the preparation method comprising the following steps:

[0082] Placing the active material flat on the surface of the cathode, and arranging the cathode and the anode in the electroplating solution in parallel along the horizontal direction, and performing electroplating treatment to obtain a positive electrode material precursor;

[0083] The positive electrode material precursor is sintered to obtain a composite positive electrode material.

[0084] The anode and the cathode are independently prepared from materials with electrical conductivity, specifically, materials such as graphite, aluminum, copper, nickel, stainless steel, and nickel-plated steel can be used.

[0085] The electroplating tank used in the electroplating treatment can be made of, but not limited to, acrylic, stainless steel, titanium, PP, PVC, FRP and other materials. The cros...

Embodiment 1

[0130] A preparation method of a composite positive electrode material includes the following steps S10 to S40:

[0131] In step S10, the thin graphite sheet is used as the anode and the thick graphite sheet is used as the cathode, such as figure 1 As shown, the anode and cathode are placed on the top and bottom surfaces of the electroplating tank, respectively, so that the anode and cathode are arranged in parallel up and down.

[0132] Step S20, configuring an ionic liquid electroplating solution: in an inert atmosphere, choline chloride and urea are mixed in a molar ratio of 1:1 to form an ionic liquid. Then, aluminum chloride with a mass of 5% of the mass of the ionic liquid is added to the ionic liquid, and the mixture is uniformly mixed to obtain an electroplating solution with a pH value of 7.8.

[0133] Step S30, 5g of positive electrode material NCM811 powder (d 0 = 15 μm) on the surface of the cathode, the NCM811 powder was uniformly adsorbed on the surface of the ...

Embodiment 2

[0137] Compared with Example 1, except that the metal salt in step S20 is tungsten chloride, the others are the same as Example 1.

[0138] The composite positive electrode material prepared in this example includes an active material and a coating layer existing on the surface of the active material, and the coating layer includes tungsten oxide.

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Abstract

The invention relates to the field of electrode materials, in particular to a composite positive electrode material and a preparation method thereof.The composite positive electrode material comprises an active substance and a coating layer existing on the surface of the active substance, and the coating layer comprises a metal compound; wherein the stress tensor sigma between the coating layer and the active material is 1.3 to 1.5. According to the composite positive electrode material provided by the invention, the coating layer is tightly combined with the active substance, the surface of the positive electrode material is completely coated with the coating layer, and the composite positive electrode material has excellent long-cycle stability and electrochemical performance.

Description

technical field [0001] The present application relates to the technical field of electrode materials, in particular to a composite positive electrode material and a preparation method thereof. Background technique [0002] The cathode material has defects such as serious phase transition and oxygen release during the charge and discharge process, the surface is prone to side reactions with the electroplating solution, and the storage performance is poor. These defects will affect the life of the cathode material, thereby limiting its wide application. In the related art, in order to solve the problem of the life of the positive electrode material, the surface of the positive electrode material is usually coated and modified. Through the coating modification, a physical isolation layer can be constructed on the surface of the positive electrode material, which can effectively slow down the electroplating solution on the surface of the positive electrode material. Side reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/58H01M4/525H01M10/0525H01M4/1397H01M4/1391H01M4/04
CPCH01M4/366H01M4/62H01M4/045H01M4/1397H01M4/1391H01M10/0525H01M4/525H01M4/5825H01M2004/028
Inventor 王皓逸宋雄吴小珍杨顺毅黄友元王金合张金龙
Owner 贝特瑞(江苏)新材料科技有限公司
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