A synthesis method for improving the voltage drop of positive electrode material, positive electrode material and application

A synthesis method and positive electrode material technology, applied in positive electrodes, chemical instruments and methods, batteries, etc., can solve the problems of material energy density reduction, cycle performance and voltage attenuation, and achieve improved voltage drop, improved voltage drop, and voltage drop Reduced effect

Active Publication Date: 2022-02-22
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The cobalt-free lithium-rich cathode materials in the existing synthesis process are often cycled, and the cycle performance and voltage decay seriously, resulting in a decrease in the energy density of the material.

Method used

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  • A synthesis method for improving the voltage drop of positive electrode material, positive electrode material and application

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Embodiment 1

[0043] This embodiment provides a synthesis method for improving the voltage drop of the positive electrode material. The synthesis method specifically includes the following steps:

[0044] (1) Positive electrode precursor Ni 0.25 mn 0.75 (OH) 2 Mix it with nickel acetate at a mass ratio of 100:1, put it in an air atmosphere after mixing, raise the temperature to 400°C at a heating rate of 2°C / min, keep it warm for 5h, and complete one sintering to obtain the first sintered material;

[0045] (2) Lithium hydroxide and the first sintered material are fed according to the molar ratio of Li:(Ni+Mn)=1.3, and then the dopant zirconia is added, and the amount of zirconia added accounts for the total mass of lithium hydroxide and the first sintered material 2000ppm of 2000ppm; after mixing, put it in the air atmosphere, raise the temperature to 800°C at a heating rate of 2°C / min, keep it for 10h, and complete the second sintering to obtain the second sintered material;

[0046] (...

Embodiment 2

[0048] This embodiment provides a synthesis method for improving the voltage drop of the positive electrode material. The synthesis method specifically includes the following steps:

[0049] (1) Positive electrode precursor Ni 0.25 mn 0.75 (OH) 2 Mix it with nickel carbonate at a mass ratio of 50:1, put it in an air atmosphere after mixing, raise the temperature to 300°C at a heating rate of 5°C / min, keep it warm for 7h, and complete one sintering to obtain the first sintered material;

[0050] (2) Lithium hydroxide and the first sintered material are fed according to the molar ratio of Li:(Ni+Mn)=1.35, and then the dopant yttrium oxide is added, and the amount of yttrium oxide added accounts for the total mass of lithium hydroxide and the first sintered material 1500ppm; after mixing, put it in the air atmosphere, raise the temperature to 900°C at a heating rate of 1°C / min, keep it for 8h, and complete the second sintering to obtain the second sintering material;

[0051] ...

Embodiment 3

[0053] This embodiment provides a synthesis method for improving the voltage drop of the positive electrode material. The synthesis method specifically includes the following steps:

[0054] (1) Positive electrode precursor Ni 0.25 mn 0.75 (OH) 2 Mix it with nickel acetate at a mass ratio of 70:1, put it in an air atmosphere after mixing, raise the temperature to 350°C at a heating rate of 4°C / min, keep it warm for 6h, and complete one sintering to obtain the first sintered material;

[0055] (2) Lithium hydroxide and the first sintered material are fed according to the molar ratio of Li:(Ni+Mn)=1.4, and then the dopant lanthanum oxide is added, and the amount of lanthanum oxide added accounts for the total mass of lithium hydroxide and the first sintered material 1700ppm of 1700ppm; after mixing, put it in the air atmosphere, raise the temperature to 860°C at a heating rate of 2°C / min, keep it for 9h, and complete the second sintering to obtain the second sintered material;...

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Abstract

The present invention provides a synthesis method for improving the voltage drop of the cathode material, the cathode material and its use. The synthesis method comprises: the cathode precursor is mixed with the first nickel source and then sintered once to obtain the first sintered material, the first sintered material, The lithium source and the dopant are mixed and sintered twice to obtain the second sintered material, and the second sintered material is mixed with the second nickel source and then sintered three times to obtain the positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials, and relates to a synthesis method for improving the voltage drop of positive electrode materials, positive electrode materials and applications. Background technique [0002] With the continuous deterioration of the environment and the gradual scarcity of fossil fuels, human demand for energy is becoming more and more clean and portable. Due to the advantages of non-polluting, large energy storage and easy portability, lithium-ion secondary batteries are widely used in 3C devices such as mobile phone batteries, computers, and cameras. With the development of technology, lithium-ion batteries with high energy density are more and more widely used in hybrid electric vehicles and even pure electric vehicles to provide power for people's travel. [0003] Lithium nickel manganese cobalt oxide ternary cathode material has the advantages of high energy density, good cycle performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/052
CPCC01G53/42C01G53/50H01M4/505H01M4/525H01M10/052H01M2004/028H01M2220/20H01M2220/30C01P2004/80Y02E60/10
Inventor 施泽涛乔齐齐李子郯杨红新王鹏飞郭丰
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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