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Hollow positive electrode material, precursor thereof, and preparation method of precursor

A cathode material and precursor technology, which is applied in the field of hollow cathode material precursor and its preparation, can solve the problem of difficulty in large-scale and efficient production of hollow material precursor, and the inability to meet the high output power and high cycle of power batteries. The requirements of characteristics, etc., to achieve the effect of high tap density, low cost and simple process

Active Publication Date: 2021-08-13
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.
[0009] In summary, it is difficult to produce precursors of hollow materials with high tap density on a large scale and efficiently with existing technologies.

Method used

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  • Hollow positive electrode material, precursor thereof, and preparation method of precursor
  • Hollow positive electrode material, precursor thereof, and preparation method of precursor
  • Hollow positive electrode material, precursor thereof, and preparation method of precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 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 60:20:20, and prepare a 2mol / L sodium hydroxide solution. Add pure water to the reaction kettle with a volume of 100L, control the temperature at 55°C, add ammonia water to adjust the concentration of ammonia water in the reaction kettle to 7g / L, add lye to adjust the pH to 11.80, and add 1.3L / The flow rate of min is continuously fed into the air.

[0044] In the reaction process of stage I, inject the ternary metal salt solution with the flow rate of 3.6L / h in the reactor, control reaction temperature to be 55 ℃, regulate the flow of the ammoniacal liquor and the sodium hydroxide solution injected in the reactor, make the reactor The pH inside was maintained at 11.80, the concentration of ammonia water was maintained at 7g / L, the pH was adjusted to 11.40 after 1 hour of reaction, ...

Embodiment 2

[0048] 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 60:20:20, and prepare a 2mol / L sodium hydroxide solution. Add pure water to the reactor with a volume of 100L, control the temperature at 55°C, add ammonia to adjust the ammonia concentration in the reactor to 7g / L, add lye to adjust the pH to 12.0, and add 0.75L / The flow rate of min is continuously fed into the air.

[0049] In the reaction process of stage I, inject ternary metal salt solution with the flow rate of 2.4L / h in the reactor, control reaction temperature to be 55 ℃, regulate the flow of the ammoniacal liquor and the sodium hydroxide solution injected in the reactor, make the reactor The pH inside was maintained at 12.0, the concentration of ammonia water was maintained at 7g / L, the pH was adjusted to 11.40 after 0.5h of reaction, the air flow rate was reduced to 0.1L / ...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a precursor of a hollow positive electrode material, and a preparation method of the precursor. The inner core of the precursor is provided with an inner core part and an outer shell part, the inner core part is loose, the outer shell part is compact, the high tap density is achieved, and the capacity of the hollow material can be improved on the premise that the output characteristic of the hollow material is guaranteed. According to the preparation method disclosed by the invention, the precursor of the hollow material with large core proportion, coarse primary particle size on the outer wall and fewer pores is obtained mainly by controlling the flow of the metal salt solution, the reaction time of the stage I and the reaction pH and atmosphere of the stage II. The invention also provides a hollow positive electrode material obtained by mixing and sintering the precursor and a lithium source.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a precursor of a high tap density hollow positive electrode material 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 requirements of battery manufacturers for high output power and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/01C01P2004/34C01P2004/50C01P2004/61C01P2004/62C01P2006/11H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 刘凯胡海诗胡志兵张海艳李玉云熊海龙熊意球刘宙张娉婷
Owner JINCHI ENERGY MATERIALS CO LTD
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