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Aluminum-doped positive electrode material precursor as well as preparation method and application thereof

A positive electrode material and precursor technology, applied in the field of aluminum-doped positive electrode material precursor and its preparation, can solve the problems of uneven precipitation, widened precipitation particle size, poor morphology, etc. The effect of low density and improved sphericity

Active Publication Date: 2022-05-27
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since aluminum ions are basically not complexed with ammonia, the solubility product constant of aluminum hydroxide is 1.9×10 -33 Much smaller than nickel hydroxide and cobalt hydroxide, aluminum hydroxide is easy to nucleate alone, forming a white colloidal precipitate with extremely small particle size, which promotes the widening of the overall precipitate particle size, uneven precipitation, and poor morphology
As a result, the ternary cathode material NCA material cannot be fixed and unified during the sintering process, and different sintering processes need to be adjusted for different production batches, which affects quality stability and production efficiency

Method used

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  • Aluminum-doped positive electrode material precursor as well as preparation method and application thereof
  • Aluminum-doped positive electrode material precursor as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0048] In this example, an aluminum-doped positive electrode material precursor is prepared, which includes the following steps:

[0049] (1) According to the required molar ratio of nickel, cobalt, aluminum and calcium elements, namely 0.85:0.1:0.05:0.1, the chloride salts of nickel, cobalt, aluminum and calcium are selected as raw materials, and the total molar concentration of metal ions is prepared first. It is a mixed salt solution of 2.5mol / L of nickel, cobalt and calcium;

[0050] (2) the sodium hydroxide solution that the preparation concentration is 1.5mol / L, and the aluminum chloride in the step (1) is dissolved in the sodium hydroxide solution to make an aluminum alkali solution, and the molar concentration of Al in the aluminum alkali solution is 0.12mol / L;

[0051] (3) the ammoniacal liquor that preparation concentration is 12.0mol / L is used as complexing agent;

[0052] (4) in the reactor, add bottom liquid to diffuse bottom stirring paddle, bottom liquid is th...

Embodiment 2

[0063] In this example, an aluminum-doped positive electrode material precursor is prepared, and the specific process is as follows:

[0064] (1) According to the required molar ratio of nickel, cobalt, aluminum and calcium elements, that is, 0.9:0.05:0.05:0.1, the chloride salts of nickel, cobalt, aluminum and calcium are selected as raw materials, and the total molar concentration of metal ions is prepared first. It is a mixed salt solution of 1.5mol / L nickel cobalt calcium;

[0065] (2) the sodium hydroxide solution that the preparation concentration is 1.0mol / L, and the aluminum chloride in the step (1) is dissolved in the sodium hydroxide solution to make an aluminum alkali solution, and the molar concentration of Al in the aluminum alkali solution is 0.14mol / L;

[0066] (3) the ammoniacal liquor that preparation concentration is 9.0mol / L is used as complexing agent;

[0067] (4) in the reactor, add bottom liquid to diffuse bottom stirring paddle, bottom liquid is the m...

Embodiment 3

[0077] In this example, an aluminum-doped positive electrode material precursor is prepared, and the specific process is as follows:

[0078] (1) According to the required molar ratio of nickel, cobalt, aluminum and calcium elements, namely 0.95:0.03:0.02:0.04, the nitrates of nickel, cobalt, aluminum and calcium were selected as raw materials, and the total molar concentration of metal ions was first prepared as 1.0mol / L mixed salt solution of nickel, cobalt and calcium;

[0079] (2) the sodium hydroxide solution that the preparation concentration is 2.0mol / L, and the aluminum nitrate in the step (1) is dissolved in the sodium hydroxide solution to make an aluminum alkali solution, and the molar concentration of Al in the aluminum alkali solution is 0.1 mol / L;

[0080] (3) the ammoniacal liquor that preparation concentration is 6.0mol / L is used as complexing agent;

[0081] (4) in the reactor, add bottom liquid to diffuse bottom stirring paddle, bottom liquid is the mixed s...

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Abstract

The invention discloses an aluminum-doped positive electrode material precursor and a preparation method and application thereof.The preparation method comprises the steps that a nickel-cobalt-calcium mixed salt solution, a first aluminum alkali solution, ammonia water and a sodium hydroxide solution are added into a base solution for a reaction, solid-liquid separation is conducted to obtain a filter cake, the filter cake is soaked in a second aluminum alkali solution, solid-liquid separation is conducted to obtain a solid material, and the solid material is dried to obtain the aluminum-doped positive electrode material precursor. And calcining the solid material, and soaking the calcined material in water to obtain the aluminum-doped positive electrode material precursor. According to the precursor, the nickel-cobalt-aluminum co-precipitation effect is achieved, the material gradually forms a porous structure under the effects of subsequent chlorine removal, calcium removal and dehydration, the material has the characteristic of low tap density, and diffusion of a lithium source is facilitated when the precursor and the lithium source are sintered to prepare a positive electrode material subsequently.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to an aluminum-doped positive electrode material precursor and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used due to their advantages of good cycle performance, high capacity, low price, convenient use, safety and environmental protection. Today, with the increasing market demand for high-performance batteries such as high energy density and the continuous popularization of electric vehicles, the market demand for battery cathode materials has shown a rapid growth trend. Due to the characteristics of high energy density, relatively low cost, and excellent cycle performance, ternary cathode materials are the most potential and promising materials among the current mass-produced cathode materials. Therefore, it is imminent to improve the performance of ternary precursors. [0003] There are ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M10/0525H01M4/36H01M4/525
CPCC01G53/40H01M10/0525H01M4/364H01M4/525C01P2004/03C01P2006/11C01P2006/12C01P2004/61C01P2004/32H01M2004/021H01M2004/028Y02E60/10C01P2006/14H01M4/36H01M4/505
Inventor 余海军谢英豪李爱霞张学梅李长东
Owner GUANGDONG BRUNP RECYCLING TECH