Positive electrode active material and preparation method thereof, secondary battery positive electrode and lithium battery

A positive electrode active material and secondary battery technology, which is applied in the field of materials, can solve the problems of limited stability improvement of lithium cobalt oxide materials, and achieve the effects of improving cycle stability and improving harmful reactions

Active Publication Date: 2020-11-13
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned metal doping has a limited effect on improving the stability of lithium cobalt oxide materials.

Method used

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  • Positive electrode active material and preparation method thereof, secondary battery positive electrode and lithium battery
  • Positive electrode active material and preparation method thereof, secondary battery positive electrode and lithium battery
  • Positive electrode active material and preparation method thereof, secondary battery positive electrode and lithium battery

Examples

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preparation example Construction

[0059] The present application also provides a method for preparing the above-mentioned positive electrode active material, including:

[0060] first doping boron in the lithium-containing compound particles, and then doping nickel;

[0061] Or, doping nickel in the lithium-containing compound particles first, and then doping boron;

[0062] Alternatively, boron and nickel are doped together in the lithium-containing compound particles.

[0063] In other words, in this application, nickel and boron can be doped simultaneously, or one can be doped first, and then the other can be doped.

[0064] In the embodiment of this application, doping is performed by sintering. It can be understood that in other embodiments of this application, other methods can be used for doping. In this embodiment, high temperature sintering is used. Doping is described as an example.

[0065] For example, the boron source, the nickel source, the fusion agent and the lithium-containing compound part...

Embodiment 1

[0089] This embodiment provides a positive electrode active material, which is mainly prepared by the following method:

[0090] 50g of LiCo 0.98 al 0.02 o 2 Material, 0.2g H 3 BO 3 , 0.15g NiO, 2g sucrose and 20g deionized water were evenly mixed, and the resulting mixture was dried in a 120°C water bath environment, and the above-mentioned dried mixture was calcined at 800°C for 5h, and the heating rate was 3°C / min. After the calcination was completed, Decrease to room temperature at a rate of 5°C / min.

[0091] figure 1 A STEM image of the positive electrode active material provided in Example 1 of the present application is shown. figure 2 A STEM line scan image of the surface of the positive electrode active material provided in Example 1 of the present application is shown.

[0092] from figure 1 and figure 2 It can be seen that the contents of boron and nickel elements gradually decrease from the surface to the interior.

Embodiment 2

[0094] This embodiment provides a positive electrode active material, which is mainly prepared by the following method:

[0095] 50g of LiCo 0.98 al 0.02 o 2 Material, 0.15g B 2 o3 , 0.15g NiO were evenly mixed, and the resulting mixture was calcined in air at 800°C for 5h with a heating rate of 3°C / min, and after the calcination was completed, the rate was lowered to room temperature at a rate of 5°C / min.

[0096] image 3 The XPS characterization diagram of the cathode active material provided in Example 2 is shown. image 3 It can be seen that: LiCo doped with boron and nickel elements 0.98 Al 0.02 o 2 The relative content changes of boron and nickel elements on the surface obtained by XPS characterization at different etching depths, we can see that the content of boron and nickel elements decreases from the surface to the interior as the etching depth increases.

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Abstract

The invention relates to the field of materials, in particular to a positive electrode active material, a preparation method thereof, a secondary battery positive electrode and a lithium battery. Thepositive electrode active material includes lithium-containing compound particles having a chemical formula of Li1 + xCo1-yMzOu, boron gradiently doped to the lithium-containing compound particles, and nickel gradiently doped to the lithium-containing compound particles. And the contents of boron and nickel are gradually reduced in a gradient manner from the outer surfaces of the lithium-containing compound particles to the inner parts. Due to gradient doping of nickel and boron, the surface activity of Li1+xCo1-yMzOu with a lamellar structure can be obviously reduced. The synergistic effect is achieved on the surfaces of lithium-containing compound particles. The surface activity of the layered lithium cobalt oxide is synergistically reduced, the electronic conductivity of the lithium cobalt oxide material is increased while the stability of the lithium cobalt oxide material is improved, and the dissolution of transition metal on the surface of the layered positive electrode active material in the cycle process under high-temperature and high-pressure conditions is inhibited, so that the capacity retention ratio and the charge-discharge coulombic efficiency of the lithium cobalt oxide material are improved.

Description

technical field [0001] The present application relates to the field of materials, in particular, to a positive electrode active material and a preparation method thereof, a secondary battery positive electrode, and a lithium battery. Background technique [0002] Compared with other rechargeable battery systems, lithium-ion secondary batteries have the advantages of high working voltage and light weight. The positive electrode materials of lithium-ion secondary batteries can be roughly divided into three categories, lithium cobaltate, lithium iron phosphate and lithium manganate. [0003] Lithium cobaltate has high capacity and density; for high-voltage lithium cobaltate cathode material, during the cycle, due to the interaction between the traditional carbonate electrolyte and the cathode material, the surface of the cathode material loses oxygen, and the surface of the material occurs Dissolution, which eventually leads to a reduction of the active substance. [0004] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62H01M4/131H01M10/052H01M10/0525C01G51/00
CPCH01M4/525H01M4/628H01M4/626H01M4/131H01M10/052H01M10/0525C01G51/42C01P2004/01C01P2002/85H01M2004/021H01M2004/028Y02E60/10
Inventor 武怿达黄学杰詹元杰马晓威张义郭亚奇
Owner SONGSHAN LAKE MATERIALS LAB
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