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Preparation method for reducing voltage drop of positive electrode material, positive electrode material and application

A positive electrode material and voltage drop technology, applied in chemical instruments and methods, circuits, electrical components, etc., can solve problems such as voltage drop, and achieve the effects of reduced voltage drop, tight combination, and simple process

Pending Publication Date: 2022-01-04
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem of voltage drop during the cycle of the material

Method used

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  • Preparation method for reducing voltage drop of positive electrode material, positive electrode material and application

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Embodiment 1

[0053] This embodiment provides a preparation method for reducing the voltage drop of the positive electrode material, the preparation method comprising:

[0054] (1) Cobalt-free precursor Ni 0.45 mn 0.55 (OH) 2 with dopant Al 2 o 3 Put into the mixing device, the quality of the Al element in the dopant accounts for 0.1wt% of the total mass of the nickel element and manganese element in the precursor, the material filling rate in the mixing device is 30%, and the first mixing is carried out at a stirring speed of 500rpm for 20min ;

[0055] (2) After the first mixing, the mixed material is placed in the air atmosphere for the first sintering, and the temperature is raised to 700°C at a heating rate of 1°C / min, kept for 3h, and then cooled to room temperature with the furnace to obtain Al-containing Elemental Oxide Ni 0.45 mn 0.55 o 2 ;

[0056] (3) Lithium source Li 2 CO 3 and oxide according to the molar ratio of Li:(Ni+Mn) is 1.1:1 into the mixing device, the mate...

Embodiment 2

[0059] This embodiment provides a preparation method for reducing the voltage drop of the positive electrode material, the preparation method comprising:

[0060] (1) Cobalt-free precursor Ni 0.2 mn 0.8 (OH) 2 with dopant ZrO 2 Put into the mixing device, the quality of Zr element in the dopant accounts for 0.15wt% of the total mass of nickel element and manganese element in the precursor, the material filling rate in the mixing device is 40%, carry out the first mixing 18min under the stirring speed of 600rpm ;

[0061] (2) After the first mixing, put the mixed material in an oxygen atmosphere for the first sintering, raise the temperature to 650°C at a heating rate of 2°C / min, keep it for 3.5h, and then cool it to room temperature with the furnace to obtain Oxide Ni of Zr element 0.2 mn 0.8 o 2 ;

[0062] (3) The lithium source LiOH and the oxide are put into the mixing device according to the molar ratio of Li:(Ni+Mn) of 1.6:1, the material filling rate in the mixin...

Embodiment 3

[0065] This embodiment provides a preparation method for reducing the voltage drop of the positive electrode material, the preparation method comprising:

[0066] (1) Cobalt-free precursor Ni 0.25 mn 0.75 (OH) 2 with dopant TiO 2 Put into the mixing device, the mass of the Ti element in the dopant accounts for 0.2wt% of the total mass of the nickel element and the manganese element in the precursor, the material filling rate in the mixing device is 50%, and the first mixing is carried out at a stirring speed of 800rpm for 15min ;

[0067] (2) After the first mixing, put the mixed material in the air atmosphere for the first sintering, raise the temperature to 600°C at a heating rate of 3°C / min, keep it for 4h, and then cool it to room temperature with the furnace to obtain Ti-containing Elemental Oxide Ni 0.25 mn 0.75 o 2 ;

[0068] (3) Lithium source LiNO 3 and oxide according to the molar ratio of Li:(Ni+Mn) is 1.5:1 into the mixing device, the material filling rate...

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Abstract

The invention provides a preparation method for reducing the voltage drop of a positive electrode material, the positive electrode material and an application. The preparation method comprises the steps: sequentially carrying out first mixing and first sintering on a precursor and a dopant to obtain an oxide containing a doping element, and sequentially carrying out second mixing and second sintering on the oxide and a lithium source to obtain the positive electrode material. Doping is carried out in the precursor pretreatment process, so that the voltage drop of the positive electrode material is reduced. The doping element can better stabilize lattice oxygen in the precursor. When the doped oxide and the lithium salt are mixed and sintered, lattice oxygen and the doped element are combined more tightly, and more stable metal element and oxygen chemical bonds are formed, so that the material structure is more stable, and the reduction of voltage and capacity in the cycle process is smaller. The method is simple in technological process and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a preparation method for reducing the voltage drop of positive electrode materials, positive electrode materials and applications. Background technique [0002] At present, the development of electric vehicles is facing two major problems of short mileage and poor safety, which restrict their large-scale promotion and application. The most direct and effective way to solve the problem is to use positive and negative active materials for batteries with high energy density. [0003] As a cathode material for lithium-ion batteries, LiCoO is widely used at present. 2 , which has the advantages of good processability and long cycle life. However, the reserves of cobalt resources in the world are small and the resources are scarce. The production of LiCoO 2 The production cost of cobalt is higher, and the toxicity of cobalt is bigger, and serious harm is caused to environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/56C01G53/50H01M4/505H01M4/525H01M10/0525C01P2004/80C01P2006/40Y02E60/10
Inventor 乔齐齐杨红新李子郯王鹏飞施泽涛郭丰
Owner SVOLT ENERGY TECHNOLOGY CO LTD