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Aluminum-doped cobalt carbonate material and preparation method thereof, and aluminum-doped cobaltosic oxide and lithium cobalt oxide positive electrode material

A technology of tricobalt tetroxide and cobalt carbonate materials, applied in cobalt oxide/cobalt hydroxide, cobalt carbonate, nanotechnology for materials and surface science, etc., can solve the problem of uneven distribution of aluminum elements, avoid precipitation and recrystallization, Effect of improving stability, reducing differences in particle density and crystallinity

Pending Publication Date: 2022-03-15
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the washing and drying process of aluminum-doped cobalt carbonate, the aluminum compound inside it will undergo a morphological transformation, precipitate and recrystallize to form an obvious flaky aluminum compound, and eventually cause the uneven distribution of aluminum elements.

Method used

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  • Aluminum-doped cobalt carbonate material and preparation method thereof, and aluminum-doped cobaltosic oxide and lithium cobalt oxide positive electrode material
  • Aluminum-doped cobalt carbonate material and preparation method thereof, and aluminum-doped cobaltosic oxide and lithium cobalt oxide positive electrode material
  • Aluminum-doped cobalt carbonate material and preparation method thereof, and aluminum-doped cobaltosic oxide and lithium cobalt oxide positive electrode material

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Effect test

Embodiment 1

[0094] The preparation method of the aluminum-doped cobalt carbonate material provided in this embodiment comprises the following steps:

[0095] (1) Cobalt chloride and aluminum chloride are dissolved in water, and after mixing uniformly, an aluminum-cobalt mixed solution is obtained; in the described aluminum-cobalt mixed solution, the mass concentration of the cobalt element is 90g / L, and the amount of the aluminum element and the cobalt element Mass ratio is 0.0062:1; And preparation mass concentration is the ammonium bicarbonate solution of 190g / L as precipitant solution; Preparation mass concentration is the ammonium bicarbonate solution of 10g / L as bottom liquid;

[0096] (2) Add the aluminum-cobalt mixed solution and the precipitating agent solution prepared in step (1) into the reaction kettle containing the bottom liquid at the same time, and carry out the reaction. When the particle grows to a particle size of 12.9 μm, stop feeding to obtain the inner core; During t...

Embodiment 2

[0099] The preparation method of the aluminum-doped cobalt carbonate material provided in this embodiment comprises the following steps:

[0100] (1) Cobalt sulfate and aluminum sulfate are dissolved in water, and after mixing uniformly, an aluminum-cobalt mixed solution is obtained; in the described aluminum-cobalt mixed solution, the mass concentration of cobalt element is 130g / L, and the mass ratio of aluminum element to cobalt element is It is 0.0126:1; And preparation mass concentration is the ammonium bicarbonate solution of 230g / L as precipitant solution; Preparation mass concentration is the ammonium bicarbonate solution of 30g / L as bottom liquid;

[0101] (2) adding the aluminum-cobalt mixed solution prepared in step (1) and the precipitating agent solution into the reaction kettle containing the bottom liquid at the same time, and reacting, and when the particle grows to a particle size of 9.3 μm, stop feeding to obtain the inner core; During the reaction, the growth...

Embodiment 3

[0104] The preparation method of the aluminum-doped cobalt carbonate material provided in this embodiment comprises the following steps:

[0105] (1) Cobalt chloride and aluminum chloride are dissolved in water, and after mixing uniformly, an aluminum-cobalt mixed solution is obtained; in the described aluminum-cobalt mixed solution, the mass concentration of the cobalt element is 100g / L, and the amount of the aluminum element and the cobalt element is Mass ratio is 0.0111:1; And preparation mass concentration is the ammonium carbonate solution of 200g / L as precipitant solution; Preparation mass concentration is the ammonium carbonate solution of 70g / L as bottom liquid;

[0106] (2) adding the aluminum-cobalt mixed solution prepared in step (1) and the precipitating agent solution into the reaction kettle containing the bottom liquid at the same time, and reacting, and when the particle grows to a particle size of 12.5 μm, stop feeding, and obtain the inner core; During the re...

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Abstract

The invention relates to the technical field of lithium ion battery positive electrode precursor materials, in particular to an aluminum-doped cobalt carbonate material and a preparation method thereof, and aluminum-doped cobaltosic oxide and lithium cobalt oxide positive electrode materials. The aluminum-doped cobalt carbonate material has a core-shell structure, and the shell and the core of the core-shell structure are aluminum-doped cobalt carbonate; wherein the overall crystallite size of the aluminum-doped cobalt carbonate material is larger than 15 nm, and the crystallite size of the inner core is smaller than 20 nm; and the ratio of the crystallite size of the whole aluminum-doped cobalt carbonate material to the crystallite size of the core is greater than 1.05. The crystallite size of the shell and the crystallite size of the inner core are controlled to be within the specific range, the crystallite size of the shell is larger than that of the inner core, it can be guaranteed that the aluminum element in the aluminum-doped cobalt carbonate material is evenly distributed, and the density of the shell can be improved; and an internal aluminum compound is prevented from being separated out and recrystallized in the washing and drying processes.

Description

technical field [0001] The invention relates to the technical field of positive electrode precursor materials for lithium ion batteries, in particular to an aluminum-doped cobalt carbonate material and a preparation method thereof, aluminum-doped tricobalt tetroxide and lithium cobaltate positive electrode materials. Background technique [0002] With the electronic equipment in the 3C field (that is, the abbreviation of three types of electronic products, computers, communications and consumer electronics products, including tablet computers, computers, electronic dictionaries, mobile phones, digital cameras, walkmans, digital audio players, audio-visual playback hardware equipment etc.), especially the performance of all aspects of smart phones has been greatly improved, thus putting forward higher requirements for battery capacity, cycle and safety in the device. [0003] The performance of lithium cobaltate, which is a cathode material in consumer batteries, is particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/06C01G51/04C01G51/00B82Y40/00B82Y30/00
CPCC01G51/06C01G51/04C01G51/42B82Y30/00B82Y40/00C01P2004/64C01P2004/61C01P2004/62C01P2004/80C01P2004/03
Inventor 訚硕翁毅周明涛王灯周正卿毕尧胡俊康何乐
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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