Preparation method and application of magnesium-titanium co-doped cobalt carbonate

A technology of co-doping and cobalt carbonate, applied in the direction of cobalt carbonate, structural parts, electrical components, etc., to achieve the effect of concentrated particle size distribution, increase adsorption capacity, and promote growth

Pending Publication Date: 2022-07-05
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because nano-titanium dioxide is insoluble in water, it requires very strong stirring equipment and effective dispersants

Method used

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  • Preparation method and application of magnesium-titanium co-doped cobalt carbonate
  • Preparation method and application of magnesium-titanium co-doped cobalt carbonate
  • Preparation method and application of magnesium-titanium co-doped cobalt carbonate

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Embodiment 1

[0042] The present embodiment prepares a magnesium-titanium co-doped cobalt carbonate, and the specific process is:

[0043] Step 1. Prepare a solution: configure a cobalt-magnesium mixed metal solution A of cobalt chloride and magnesium chloride, wherein the cobalt concentration is 2.0mol / L, the mass ratio of magnesium-cobalt elements is 0.005, and a mixed solution C of citric acid and titanium chloride is configured, wherein The concentration of titanium ions is 0.05mol / L, the molar ratio of citric acid to titanium is 0.2, the pH of the mixed solution C is 0.8 at room temperature, and the mixed precipitant solution B of ammonium bicarbonate solution and ammonium dodecyl sulfate is configured, wherein The concentration of ammonium bicarbonate is 3mol / L, and the mass ratio of ammonium dodecyl sulfate and ammonium bicarbonate is 0.05;

[0044] Step 2. Synthesis of magnesium-titanium co-doped cobalt carbonate: pure water and ammonium bicarbonate solution are added to the reaction ...

Embodiment 2

[0048] The present embodiment prepares a magnesium-titanium co-doped cobalt carbonate, and the specific process is:

[0049] Step 1. Prepare a solution: configure a cobalt-magnesium mixed metal solution A of cobalt sulfate and magnesium sulfate, wherein the cobalt concentration is 1.8 mol / L, the mass ratio of magnesium-cobalt elements is 0.008, and a mixed solution C of tartaric acid and titanium sulfate is configured, wherein titanium ions are The concentration is 0.18mol / L, the molar ratio of tartaric acid to titanium is 0.6, the pH of the prepared mixed solution is 0.5 at room temperature, and the mixed precipitant solution B of ammonium bicarbonate solution and sodium laurate is configured, wherein the concentration of is 2.5mol / L, and the mass ratio of sodium laurate to ammonium bicarbonate is 0.10;

[0050] Step 2. Synthesis of magnesium-titanium co-doped cobalt carbonate: pure water and ammonium bicarbonate solution are added to the reaction kettle as the bottom liquid,...

Embodiment 3

[0054] The present embodiment prepares a magnesium-titanium co-doped cobalt carbonate, and the specific process is:

[0055] Step 1. Prepare a solution: configure a cobalt-magnesium mixed metal solution A of cobalt nitrate and magnesium nitrate, wherein the cobalt concentration is 1.5mol / L, the mass ratio of magnesium-cobalt elements is 0.01, and a mixed solution C of gluconic acid and titanyl sulfate is configured, wherein The titanium ion concentration is 0.1mol / L, the molar ratio of gluconic acid and titanium is 0.5, the pH of the prepared mixed metal solution is 1.0 at room temperature, and the mixed precipitant solution B of ammonium bicarbonate solution and polyacrylamide is configured, in which carbonic acid The concentration of ammonium bicarbonate solution is 2.0mol / L, and the mass ratio of polyacrylamide to ammonium bicarbonate is 0.15;

[0056] Step 2. Synthesis of magnesium-titanium co-doped cobalt carbonate: pure water and ammonium bicarbonate solution are added t...

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Abstract

The invention discloses a preparation method and application of magnesium-titanium co-doped cobalt carbonate, a cobalt-magnesium mixed metal liquid, a precipitator solution and a titanium salt solution are added into a base solution in a parallel flow mode for a reaction, magnesium-titanium co-doped cobalt carbonate slurry is obtained, the precipitator solution is a mixed solution of carbonate and a surfactant, and the titanium salt solution is a mixed solution of magnesium carbonate and titanium carbonate. The titanium salt solution is a mixed solution of an acidic complexing agent and a titanium salt, then carrying out solid-liquid separation on the magnesium-titanium co-doped cobalt carbonate slurry, and washing and drying the obtained solid to obtain the magnesium-titanium co-doped cobalt carbonate. Titanium salt is independently fed into the solution, the acid complexing agent is added into the titanium salt solution, the effects of complexing titanium ions and inhibiting hydrolysis of titanium can be achieved at the same time, the surface active agent and the carbonate solution are mixed, the adsorption capacity of the surfaces of precursor secondary particle balls in the synthesis stage is improved, growth of magnesium-titanium co-doped cobalt carbonate is promoted, and the synthesis efficiency is improved. And the rate capability of the lithium cobalt oxide positive electrode material is remarkably improved by doping magnesium and titanium elements in the bulk phase.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode material precursors for lithium ion batteries, and in particular relates to a preparation method and application of magnesium-titanium co-doped cobalt carbonate. Background technique [0002] Due to its high energy density, lithium cobalt oxide cathode materials are mainly used in the 3C field. With the popularization of 5G mobile phones, the requirements for lithium-ion battery life, size and fast charging performance are constantly increasing. Doping titanium element in cobalt carbonate can increase the hexagonal structure layer spacing of lithium cobalt oxide cathode material, which is conducive to lithium ion deintercalation, making lithium cobalt oxide fine grains, increasing grain boundaries, shortening lithium ion diffusion distance, and reducing material diffusion. Internal resistance: Doping magnesium in cobalt carbonate can change the valence state of cobalt ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/06H01M4/505H01M4/525H01M10/0525
CPCC01G51/06H01M4/505H01M4/525H01M10/0525C01P2002/52C01P2004/61C01P2004/03C01P2006/40Y02E60/10
Inventor 卢星华李长东刘更好胡海涵阮丁山韦吉
Owner GUANGDONG BRUNP RECYCLING TECH
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