Aluminum-doped small particle spherical tricobalt tetroxide and preparation method thereof

A technology of cobalt tetroxide and small particles, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of poor cycle performance, uneven distribution of doping elements, and low tap density of lithium-ion batteries, and achieve good stability and electrochemical performance. Performance, simple process flow, high tap density effect

Active Publication Date: 2019-01-11
CNGR ADVANCED MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the small particles of cobalt tetroxide that are common in the market have the defects of low tap density, poor sphericity, and uneven distribution of doping elements, which will cause poor cycle performance and weak stability of lithium-ion batteries, etc.

Method used

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  • Aluminum-doped small particle spherical tricobalt tetroxide and preparation method thereof
  • Aluminum-doped small particle spherical tricobalt tetroxide and preparation method thereof
  • Aluminum-doped small particle spherical tricobalt tetroxide and preparation method thereof

Examples

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preparation example Construction

[0025] A method for preparing intermittent aluminum-doped small particle spherical tricobalt tetroxide, comprising the following steps:

[0026] S1, prepare metal solution and precipitant solvent respectively:

[0027] Water is used to dissolve the cobalt source and the aluminum source respectively, and then the cobalt source solution and the aluminum source solution are mixed to obtain a metal solution containing aluminum and cobalt. The cobalt source and the aluminum source are firstly dissolved to obtain a solution, which is more conducive to the uniform mixing of the cobalt source and the aluminum source, and then ensures that the prepared tricobalt tetroxide element is evenly distributed, has good sphericity, and improves its performance.

[0028] Further, the mass ratio of cobalt to aluminum in the metal solution is 100:0.01-2.5. Adopting the above-mentioned mass ratio of cobalt and aluminum in the metal solution can ensure that the content of cobalt and aluminum in the...

Embodiment 1

[0048] This embodiment provides a batch-type preparation method of aluminum-doped small particle spherical tricobalt tetroxide, comprising the following steps:

[0049] S1, prepare metal solution and precipitant solvent respectively:

[0050] Use deionized water to dissolve aluminum sulfate and cobalt chloride respectively, then mix aluminum sulfate solution and cobalt chloride solution to obtain a metal solution containing aluminum and cobalt, and the cobalt ion and aluminum ion in the metal solution are 100g / L and 0.68g respectively / L. Ammonium bicarbonate was dissolved in deionized water so that the concentration of the precipitant solution was 230 g / L.

[0051] S2, crystallization reaction;

[0052] at 10m 3 Add 500L ammonium bicarbonate solution into the reaction kettle, then heat up to 46°C and mix the metal solution and the precipitant solution in parallel flow. The flow rate of the metal solution is 400L / h, and the flow rate of the precipitant solution is 560L / h. S...

Embodiment 2-6

[0057] The batch-type aluminum-doped small-particle spherical cobalt tetroxide preparation method provided in Examples 2-6 is basically the same as the batch-aluminum-doped small-particle spherical cobalt tetroxide preparation method provided in Example 1. The difference is that the specific operating conditions change.

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Abstract

The invention relates to the field of battery materials and particularly relates to aluminum-doped small particle spherical tricobalt tetroxide and a preparation method thereof. The preparation methodcomprises: mixing a metal solution containing aluminum and cobalt and a precipitant solution according to a volume ratio of 1: 0.8 to 1.5, carrying out multiple crystallization reaction processes at30-60 DEG C to obtain crystals with desired sizes, separating a supernatant liquid and final slurry, and sintering the final slurry in stages to obtain aluminum-doped small particle spherical tricobalt tetroxide. The preparation method has the advantages of simple processes, easy control of the reaction, no pollution in the reaction and easy industrial production. The aluminum-doped small particlespherical tricobalt tetroxide has the advantages of uniform distribution of aluminum, regular surface morphology, good sphericity and high tap density.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to an aluminum-doped small particle spherical tricobalt tetroxide and a preparation method thereof. Background technique [0002] In lithium-ion battery cathode materials, LiCoO 2 Has been in the dominant position, this is due to the fact that LiCoO 2 It is very suitable for the intercalation and extraction of lithium ions. It has the advantages of high voltage, stable discharge, high specific energy, good cycle performance, simple preparation process, etc., and can adapt to high current charge and discharge. Small particles of tricobalt tetroxide are mainly used to prepare high-rate lithium cobaltate. At present, the small particles of cobalt tetroxide that are common in the market have the defects of low tap density, poor sphericity, and uneven distribution of doping elements, which will cause poor cycle performance and weak stability of lithium-ion batteries. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2002/85C01P2004/32C01P2004/61C01P2006/11
Inventor 李旭升徐祥喻鹏訚硕
Owner CNGR ADVANCED MATERIAL CO LTD
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