A kind of hollow positive electrode material and its precursor, and preparation method

A technology of cathode materials and precursors, which is applied in the field of precursors of hollow cathode materials and its preparation, can solve the problem of inability to meet the requirements of high output power and high cycle characteristics of power batteries, and the difficulty of large-scale and high-efficiency production of hollow materials Precursors and other issues, to achieve high tap density, low cost, and increase capacity

Active Publication Date: 2021-10-29
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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  • A kind of hollow positive electrode material and its precursor, and preparation method
  • A kind of hollow positive electrode material and its precursor, and preparation method
  • A kind of hollow positive electrode material and its precursor, and preparation method

Examples

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Comparison scheme
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 in particular relates to a precursor of a hollow positive electrode material and a preparation method thereof. The core of the precursor body has a core part and a shell part, and the core part is loose, the shell part is dense, and has a high tap density, which can increase the capacity of the hollow material under the premise of ensuring the output characteristics of the hollow material. The preparation method of the present invention mainly controls the flow rate of the metal salt solution, the reaction time of stage I, and the reaction pH and atmosphere of stage II to obtain the precursor of the hollow material with a large proportion of the inner core, a coarse primary particle size of the outer wall, and fewer pores. body. The present invention further provides a hollow positive electrode material obtained by mixing and sintering the above precursor and 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 Patents(China)
IPC IPC(8): H01M4/505
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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