Precursor of hollow positive electrode material and preparation method thereof

A positive electrode material and precursor technology, which is applied in the field of hollow positive electrode material precursor and its preparation, can solve the problems of inability to meet the requirements of high output power and high cycle characteristics of power batteries, etc.

Active Publication Date: 2021-05-25
JINCHI ENERGY MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ternary materials have become the main cathode materials for current power batteries due to their high energy density and good rate performance. However, traditional ternary materials cannot meet the requirements of battery manufacturers for high output power and high cycle characteristics of power batteries.
[0007] To sum up, existing technologies are difficult to produce precursors of hollow materials with narrow particle size and high specific surface area on a large scale and efficiently.

Method used

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  • Precursor of hollow positive electrode material and preparation method thereof
  • Precursor of hollow positive electrode material and preparation method thereof
  • Precursor of hollow positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Prepare a ternary metal salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate with a total metal concentration of 2mol / L, the molar ratio of nickel, cobalt, and manganese is 50:20:30, and prepare a 2mol / L sodium hydroxide solution. Add pure water into the reaction kettle with a volume of 300L, control the temperature at 70°C, adjust the pH to 11.70 with lye, and continuously feed nitrogen into the reaction kettle.

[0045] During the reaction process of stage I, inject the ternary metal salt solution into the reactor at a flow rate of 60mL / min, control the reaction temperature at 70°C, enter the reaction of stage II after the pH value of the solution drops to 9.50, and start injecting sodium hydroxide Solution, maintain the pH value of the solution within the range of 9.50±0.02, after 6 hours of reaction, increase the flow rate of the ternary metal salt solution to 120mL / min, after 12 hours, increase the flow rate of the ternary metal salt solution to 18...

Embodiment 2

[0049] Prepare a ternary metal salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate with a total metal concentration of 2mol / L, the molar ratio of nickel, cobalt, and manganese is 50:20:30, and prepare a 2mol / L sodium hydroxide solution. Add pure water into the reaction kettle with a volume of 300L, control the temperature at 70°C, adjust the pH to 11.50 with lye, and continuously feed nitrogen into the reaction kettle.

[0050] During the reaction process of stage I, inject the ternary metal salt solution into the reaction kettle at a flow rate of 60mL / min, control the reaction temperature at 70°C, enter stage II reaction after the pH value of the solution drops to 8.90, and start injecting sodium hydroxide solution , maintain the pH value of the solution within the range of 8.90±0.02, after 6 hours of reaction, increase the flow rate of the ternary metal salt solution to 100mL / min, after 10 hours, increase the flow rate of the ternary metal salt solution to ...

Embodiment 3

[0052] Prepare a ternary metal salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate with a total metal concentration of 2mol / L. The molar ratio of nickel, cobalt, and manganese is 35:35:30, and prepare a 2mol / L sodium hydroxide solution. Pure water was added to a reaction kettle with a volume of 100 L, the temperature was controlled at 65° C., the pH was adjusted to 11.70 with lye, and nitrogen gas was continuously introduced into the reaction kettle.

[0053] During the reaction process of stage I, inject the ternary metal salt solution into the reaction kettle at a flow rate of 40mL / min, control the reaction temperature at 70°C, enter stage II reaction after the pH value of the solution drops to 8.90, and start injecting sodium hydroxide solution , maintain the pH value of the solution within the range of 9.8±0.02, after 6 hours of reaction, increase the flow rate of the ternary metal salt solution to 80mL / min, after 12 hours, increase the flow rate of the t...

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Abstract

The invention belongs to the field of lithium ion battery materials, and discloses a precursor of a hollow positive electrode material and a preparation method of the precursor. The precursor synthesis process is divided into two stages, and the hollow positive electrode material precursor with narrow particle size distribution and high specific surface area is prepared by adjusting the flow and pH of the ternary metal salt solution in the reaction process of different stages. The method is simple in process, no new cost is added on the basis of an existing mainstream discontinuous method, and the method is not only suitable for manganese-containing precursors, but also suitable for manganese-free precursors such as nickel, cobalt and aluminum.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a precursor of a hollow positive electrode material with a narrow particle size distribution and a high specific surface area and a preparation method thereof. Background technique [0002] In recent years, the energy crisis and environmental pollution have become increasingly serious. In order to reduce global carbon emissions, governments of various countries have begun to increase investment in the new energy vehicle industry. Hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs) and pure electric vehicles (EVs) and other electric drive devices loaded with lithium-ion batteries have begun to gradually replace pure fuel vehicles. Ternary materials have become the main cathode materials for current power batteries because of their high energy density and good rate performance. However, traditional ternary materials cannot meet the requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/01C01P2004/32C01P2004/50C01P2004/61C01P2006/12H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘凯胡海诗张海艳胡志兵李玉云黎力苏帅张娉婷熊意球刘庭杰
Owner JINCHI ENERGY MATERIALS CO LTD
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