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Preparation method of cobalt-doped manganese lithium ion sieve compound

A technology of lithium ions and compounds, which is applied in the field of preparation of cobalt-doped manganese-based lithium ion sieve compounds, can solve the problems of unrealistic industrial production, manganese hinders the number of cycles, and increases costs, and achieves low cost and improved cycle use. The effect of life and simple process

Inactive Publication Date: 2021-03-26
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, problems such as manganese dissolution and loss seriously hinder its recycling times, greatly increasing the cost, making industrial production unrealistic

Method used

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  • Preparation method of cobalt-doped manganese lithium ion sieve compound
  • Preparation method of cobalt-doped manganese lithium ion sieve compound
  • Preparation method of cobalt-doped manganese lithium ion sieve compound

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Experimental program
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Effect test

Embodiment 1

[0022] A method for preparing a cobalt-doped manganese-based lithium ion sieve compound of the present invention specifically comprises the following steps:

[0023] Step 1, the electrolytic MnO 2 The powder is heat-treated in a muffle furnace to obtain Mn 2 o 3 Powder, wherein the heat treatment temperature is 800°C, and the reaction time is 15h;

[0024] Step 2, take Mn 2 o 3 , LiCl and CoCl 2 Mix evenly to obtain a mixture, wherein the molar ratio of lithium, manganese and cobalt elements in the mixture is 2:0.9:0.1, dissolve in 50mL water, add KOH to adjust the pH value of the solution to 13, and place the uniformly stirred solution in 50mL water In a thermal reaction kettle, place it in an oven at 180°C for heat treatment for 8 hours, and finally obtain Li(MnCo)O by vacuum filtration, rinsing with deionized water and drying. 2 powder;

[0025] Step three, the Li(MnCo)O 2 The powder is heat-treated in a muffle furnace to obtain the Co-doped manganese-based lithium ...

Embodiment 2

[0029] A method for preparing a cobalt-doped manganese-based lithium ion sieve compound of the present invention specifically comprises the following steps:

[0030] Step 1, the electrolytic MnO 2 The powder is heat-treated in a muffle furnace to obtain Mn 2 o 3 Powder, wherein the heat treatment temperature is 800°C, and the reaction time is 15h;

[0031] Step 2, take Mn 2 o 3 , LiCl and CoCl 2 Mix evenly to obtain a mixture, wherein the molar ratio of lithium, manganese and cobalt elements in the mixture is 2:0.94:0.06, dissolve in 50mL water, add KOH to adjust the pH value of the solution to 13, and place the uniformly stirred solution in 50mL water In a thermal reaction kettle, place it in an oven at 180°C for heat treatment for 8 hours, and finally obtain Li(MnCo)O by vacuum filtration, rinsing with deionized water and drying. 2 powder;

[0032] Step three, the Li(MnCo)O 2 The powder is heat-treated in a muffle furnace to obtain the Co-doped manganese-based lithiu...

Embodiment 3

[0036] A method for preparing a cobalt-doped manganese-based lithium ion sieve compound of the present invention specifically comprises the following steps:

[0037] Step 1, the electrolytic MnO 2 The powder is heat-treated in a muffle furnace to obtain Mn 2 o 3 Powder, wherein the heat treatment temperature is 800°C, and the reaction time is 15h;

[0038] Step 2, take Mn 2 o 3 , LiCl and CoCl 2 Mix evenly to obtain a mixture, wherein the molar ratio of lithium, manganese and cobalt elements in the mixture is 2:0.9:0.1, dissolve in 50mL water, add KOH to adjust the pH value of the solution to 10, and place the uniformly stirred solution in 50mL water In a thermal reaction kettle, place it in an oven at 180°C for heat treatment for 8 hours, and finally obtain Li(MnCo)O by vacuum filtration, rinsing with deionized water and drying. 2 powder;

[0039] Step three, the Li(MnCo)O 2 The powder is heat-treated in a muffle furnace to obtain the Co-doped manganese-based lithium ...

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Abstract

The invention relates to the technical field of preparation of lithium ion sieve adsorbents, in particular to a preparation method of a cobalt-doped manganese lithium ion sieve compound. The preparation method comprises the following steps: carrying out heat treatment on electrolytic MnO2 powder to obtain Mn2O3, carrying out hydrothermal reaction on Mn2O3, LiCl and CoCl2 in an alkaline environmentto obtain Li (MnCo) O2, and carrying out heat treatment on Li (MnCo) O2 to obtain a Co-doped lithium ion sieve precursor Li1.6 (MnCo) 1.6O4; and obtaining the H1.6 (MnCo) 1.6O4 lithium ion sieve through further acid pickling. The lithium ion sieve is high in purity and has a uniform spinel structure. The transition element Co-doped manganese lithium ion sieve is prepared by adopting a hydrothermal method, and the synthesized lithium ion sieve has a stable spinel structure. According to the method, MnO2 and LiCl which are low in cost are used as raw materials, and the method has the advantagesof being low in cost, simple in process, environmentally friendly, capable of saving energy and the like. According to the prepared lithium ion sieve, the recycling service life of the lithium ion sieve can be remarkably prolonged, the lowest manganese dissolution loss rate is 3.1%, the highest Li elution rate can reach 94%, the highest lithium adsorption and extraction capacity can reach 40.8 mg / g, and a good application prospect is shown.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion sieve adsorbents, in particular to a preparation method of a cobalt-doped manganese-based lithium-ion sieve compound. Background technique [0002] Lithium metal and its compounds are widely used in aerospace, alloy products, lithium battery new energy, chemical industry and other industries. They are called metal materials that "promote global progress" and are a key development strategic resource. The distribution of lithium resources in the world is relatively concentrated, and two-thirds of them exist in salt lake brine. Compared with ore lithium, brine lithium resources are more concentrated. Since brine lithium exists in the form of lithium ions, it is more environmentally friendly in terms of mining. The mining cost of lithium brine is higher than that of brine lithium, which is not friendly to the environment and consumes more energy. Therefore, using brine as raw mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30
CPCB01J20/041B01J20/06
Inventor 韩红静张超林张银龙欧立斌瞿伟李原
Owner QINGHAI UNIVERSITY