A doped basic cobalt carbonate/cobalt carbonate composite precursor and its preparation method and application

A technology of cobalt carbonate and doping, which is applied in the direction of cobalt carbonate, cobalt compounds, chemical instruments and methods, etc., to achieve high tap density, appropriate particle size increase, and uniform and stable reaction system

Active Publication Date: 2020-12-22
JINCHI ENERGY MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It can be seen from the above that many existing patents have mentioned the preparation method of the doped tricobalt tetroxide precursor, but there are basically few studies on the primary particle morphology, phase structure and electrochemical properties of the doped tricobalt tetroxide precursor. systematic research

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  • A doped basic cobalt carbonate/cobalt carbonate composite precursor and its preparation method and application
  • A doped basic cobalt carbonate/cobalt carbonate composite precursor and its preparation method and application
  • A doped basic cobalt carbonate/cobalt carbonate composite precursor and its preparation method and application

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Embodiment 1

[0031] This embodiment includes the following steps:

[0032] Step S1, using cobalt sulfate as the cobalt source and aluminum sulfate as the aluminum source, prepare a cobalt-aluminum mixed salt solution, wherein the cobalt metal concentration is 1.5mol / L, and the aluminum metal concentration is 0.03mol / L; prepare 2mol / L bicarbonate ammonium solution;

[0033] Step S2, in the 50L reactor, add a certain amount of 1.5mol / L ammonium bicarbonate solution as the base liquid, make the liquid level just below the bottom of the stirring paddle, start stirring, and the stirring line speed is 3 m / s, The reaction temperature of the control system was 45°C. Add the mixed salt solution and ammonium bicarbonate solution prepared in step S1 into the system in parallel, wherein the feed rate of the mixed salt solution is 2.5 L / h, and the ammonium bicarbonate solution feeding control system reaction pH is 7.40~7.50. When the particle size D50 is 10um, the line speed decreases by 0.2 m / s ever...

Embodiment 2

[0036] This embodiment includes the following steps:

[0037] Step S1, using cobalt sulfate as the cobalt source and aluminum sulfate as the aluminum source, prepare a cobalt-aluminum mixed salt solution, wherein the cobalt metal concentration is 1.8mol / L, and the aluminum metal concentration is 0.04mol / L; prepare 3mol / L ammonium bicarbonate solution;

[0038] Step S2, in the 50L reaction kettle, add a certain amount of 1.5mol / L ammonium bicarbonate solution as the base liquid, make the liquid level just below the bottom of the stirring paddle, start stirring, and the stirring line speed is 3.5 m / s, control The reaction temperature of the system is 50°C. Add the mixed salt solution and ammonium bicarbonate solution prepared in step S1 into the system in parallel, wherein the feed rate of the mixed salt solution is 3 L / h, and the ammonium bicarbonate solution feeding control system reaction pH value is 7.30~7.40. When the particle size D50 is 10um, the line speed decreases by...

Embodiment 3

[0041] This embodiment includes the following steps:

[0042] Step S1, using cobalt chloride as the cobalt source and aluminum chloride as the aluminum source, prepare a cobalt-aluminum mixed salt solution, wherein the cobalt metal concentration is 1.8mol / L, and the aluminum metal concentration is 0.05mol / L; prepare 2.5mol / L ammonium bicarbonate solution;

[0043] Step S2, in the 50L reaction kettle, add a certain amount of 1.0mol / L ammonium bicarbonate solution as the base liquid, make the liquid level just below the bottom of the stirring paddle, start stirring, and the stirring line speed is 3.5m / s, The reaction temperature of the control system was 55°C. Add the mixed salt solution and ammonium bicarbonate solution prepared in step S1 into the system in parallel, wherein the feed rate of the mixed salt solution is 3.5 L / h, and the ammonium bicarbonate solution feeding control system reaction pH value is 7.20~7.30. When the particle size D50 is 10um, the line speed decrea...

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Abstract

The invention belongs to the field of lithium ion battery materials, and in particular relates to a doped basic cobalt carbonate / cobalt carbonate composite precursor and its preparation method and application. In the doped basic cobalt carbonate / cobalt carbonate composite precursor, the morphology of the primary particles is flake-like, the length of the primary particles is 500nm~2um, and the width is 100~500nm; the secondary particles are compacted by the flake-like primary particles Stacked, perfect sphericity. The composite precursor has a very high tap density, which lays a certain foundation for a high-tap lithium ion battery cathode material precursor. In the process of wet synthesis of the composite precursor, the particle size of the reaction system increases appropriately by steadily reducing the stirring linear velocity of the reaction system, and at the same time, the flaky primary particles are densely packed to form secondary spherical particles.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a doped basic cobalt carbonate / cobalt carbonate composite precursor and its preparation method and application. Background technique [0002] Due to its high material density and electrode compaction density, lithium cobalt oxide lithium-ion batteries using lithium cobalt oxide positive electrodes have high volumetric energy density, so lithium cobalt oxide is the most widely used positive electrode material in the consumer electronics market. With the continuous improvement of consumer electronics products, especially 5G mobile phones, etc., the requirements for lithium-ion battery life and size continue to increase, and the development of high-voltage (4.45V and above) lithium cobalt oxide materials has become a hot spot of common concern in the scientific research community and enterprises. . As the charging voltage increases, lithium cobalt oxide materials will g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/06C01G51/00H01M4/525H01M10/0525
CPCC01G51/06C01G51/42C01P2002/72C01P2004/03C01P2004/20H01M4/525H01M10/0525Y02E60/10
Inventor 吴泽盈张海艳胡志兵孟立君刘庭杰黎力熊意球李玉云
Owner JINCHI ENERGY MATERIALS CO LTD
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