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Nano basic aluminum cobalt carbonate/cobalt carbonate composite spherical precursor

A technology of aluminum carbonate and cobalt carbonate, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of uneven distribution of aluminum elements, inability to uniformly co-precipitate, and insignificant improvement effect. Achieve the effect of good aluminum distribution uniformity and excellent high-voltage cycle performance

Active Publication Date: 2020-04-28
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid phase method mixes cobalt tetroxide, materials containing aluminum-doped elements, and lithium carbonate, and then performs high-temperature calcination to prepare aluminum-doped lithium cobaltate. However, the aluminum element is not uniformly distributed in lithium cobaltate, and the improvement effect is not obvious.
Doping aluminum in advance in the precursor preparation stage can improve the doping uniformity in the subsequent calcination stage. At present, most of the large-size spherical cobalt tetroxide on the market are prepared by precipitation method and then calcined. Price and valence state do not match, cobalt carbonate and aluminum cannot be uniformly co-precipitated, and the precipitation of aluminum in the carbonate system is extremely unstable, easy to hydrolyze and recrystallize, resulting in serious aluminum segregation and uneven doping

Method used

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  • Nano basic aluminum cobalt carbonate/cobalt carbonate composite spherical precursor
  • Nano basic aluminum cobalt carbonate/cobalt carbonate composite spherical precursor
  • Nano basic aluminum cobalt carbonate/cobalt carbonate composite spherical precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve cobalt sulfate and aluminum sulfate octadecahydrate into mixed solution A, wherein the cobalt ion concentration is 120g / L, and the aluminum ion concentration is 3.38g / L; ammonium bicarbonate is dissolved into solution B with a concentration of 220g / L.

[0025] Use solution B as a base, heat up to 45°C, start stirring at 150rpm, add solution A at a flow rate of 380L / h until the pH value in the kettle drops to 7.6, then adjust the flow rate of solution A to 600L / h, and add solution B at the same time , by adjusting the flow rate of solution B, the pH value is controlled at 7.5-7.6. When the particle size of the dispersed sample reaches 4 μm, the feeding is completed, the stirring is stopped, and the solid-liquid separation is carried out in a static manner. Finally, the supernatant is pumped away to make room for continuous feeding. , repeat the above operations until the seed crystal size reaches 9 μm.

[0026] The slurry in the reactor is separated for the firs...

Embodiment 2

[0031] Dissolve cobalt chloride and aluminum sulfate octadecahydrate into mixed solution A, wherein the cobalt ion concentration is 150g / L, and the aluminum ion concentration is 3g / L; ammonium bicarbonate is dissolved into solution B with a concentration of 220g / L.

[0032] Use solution B as a base, heat up to 45°C, start stirring at 150rpm, add solution A at a flow rate of 380L / h until the pH value in the kettle drops to 7.6, then adjust the flow rate of solution A to 600L / h, and add solution B at the same time , by adjusting the flow rate of solution B, the pH value is controlled at 7.5-7.6. When the particle size of the dispersed sample reaches 4 μm, the feeding is completed, the stirring is stopped, and the solid-liquid separation is carried out in a static manner. Finally, the supernatant is pumped away to make room for continuous feeding. , repeat the above operations until the seed crystal size reaches 9 μm.

[0033] The slurry in the reactor is separated for the first ...

Embodiment 3

[0037] Cobalt sulfate and aluminum chloride are dissolved into mixed solution A, wherein cobalt ion concentration 90g / L, aluminum ion concentration 0.8g / L; Ammonium bicarbonate is dissolved into concentration and is the solution B of 220g / L.

[0038] Use solution B as a base, heat up to 45°C, start stirring at 150rpm, add solution A at a flow rate of 380L / h until the pH value in the kettle drops to 7.6, then adjust the flow rate of solution A to 600L / h, and add solution B at the same time , by adjusting the flow rate of solution B, the pH value is controlled at 7.5-7.6. When the particle size of the dispersed sample reaches 4 μm, the feeding is completed, the stirring is stopped, and the solid-liquid separation is carried out in a static manner. Finally, the supernatant is pumped away to make room for continuous feeding. , repeat the above operations until the seed crystal size reaches 9 μm.

[0039] The slurry in the reactor is separated for the first time, that is, half of t...

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Abstract

The invention relates to the technical field of precursors of lithium cobalt oxide serving as a positive electrode material of a lithium ion battery, and particularly relates to an aluminum cobalt carbonate / cobalt carbonate composite spherical precursor and a preparation method thereof. The nano basic aluminum cobalt carbonate / cobalt carbonate composite spherical precursor is composite material formed by taking spherical cobalt carbonate as a main body material and uniformly distributing nano basic aluminum cobalt carbonate crystal particles in a bulk phase of the main body material, the expression of the composite material is (1-x)[CoCO3].x [Co6Al2CO3(OH)16.4H2O], and x is greater than or equal to 0.001 and less than or equal to 0.04. The product obtained by the invention has better aluminum distribution uniformity, is applied to the preparation of lithium cobalt oxide (LCO), is easier to uniformly dope Al into LCO crystal lattices, and has excellent high-voltage cycle performance.

Description

technical field [0001] The invention relates to the technical field of precursors of lithium cobalt oxide, a positive electrode material of lithium ion batteries, in particular to an aluminum cobalt carbonate / cobalt carbonate composite spherical precursor and a preparation method thereof. Background technique [0002] The development of mobile phone batteries puts forward higher requirements on the energy density of lithium cobalt oxide. Increasing the charge cut-off voltage of lithium cobalt oxide can effectively increase the capacity and energy density of the battery, but at this time, the crystal structure of lithium cobalt oxide is easy to collapse and the cycle performance deteriorates. Aluminum doping can effectively improve the stability of the crystal structure of lithium cobalt oxide, thereby improving the cycle performance of lithium cobalt oxide under high voltage. The traditional solid-phase method mixes cobalt tetroxide, materials containing aluminum-doped elem...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 周恩娄田礼平刘人生秦才胜高海峰游小龙
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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