Method for preparing lithium-doped and cobalt-loaded g-C3N4 photocatalyst

A photocatalyst, g-c3n4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as abandoning residual value, enhance photocatalytic performance, realize added value utilization, The effect of avoiding the use of high-purity metal salts

Active Publication Date: 2022-04-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be found that in most studies, the waste cathode material is only used as a secondary resource for recycling metal resources, and its residual value is always discarded

Method used

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  • Method for preparing lithium-doped and cobalt-loaded g-C3N4 photocatalyst
  • Method for preparing lithium-doped and cobalt-loaded g-C3N4 photocatalyst
  • Method for preparing lithium-doped and cobalt-loaded g-C3N4 photocatalyst

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Embodiment 1

[0024] This embodiment provides a method for preparing lithium-doped, cobalt-supported g-C3N4 photocatalysts, such as figure 1 , including the following steps:

[0025] 1. Disassemble the waste lithium cobalt oxide battery to obtain the positive electrode sheet, and then vacuum pyrolyze the positive electrode sheet at 450°C for 30 minutes to remove the binder to obtain the lithium cobalt oxide positive electrode material;

[0026] 2. Uniformly mix the obtained lithium cobalt oxide cathode material with melamine at a mass ratio of 3:100, and then perform anaerobic calcination. The nitrogen flow rate was controlled to 50ml / min, the heating rate was 5°C / min, the reaction temperature was 600°C, and the reaction time was 2h.

[0027] 3. The residue after the reaction was treated by ball milling to obtain the photocatalyst. The ball milling conditions were as follows: the rotation speed was 2000 rpm, and the reaction time was 1 h.

Embodiment 2

[0029] This embodiment provides a method for preparing lithium-doped, cobalt-supported g-C3N4 photocatalysts, such as figure 1 , including the following steps:

[0030] 1. Disassemble the waste lithium cobalt oxide battery to obtain the positive electrode sheet, and then vacuum pyrolyze the positive electrode sheet at 450°C for 30 minutes to remove the binder to obtain the lithium cobalt oxide positive electrode material.

[0031] 2. Mix the obtained lithium cobalt oxide cathode material with melamine uniformly at a ratio of 3:100, and then perform anaerobic calcination. The flow rate of argon gas is controlled to 100ml / min, the heating rate is 2°C / min, the reaction temperature is 550°C, and the reaction time is 2h.

[0032] 3. The residue after the reaction was treated by ball milling to obtain the photocatalyst. The ball milling conditions were as follows: the rotation speed was 2000 rpm, and the reaction time was 1 h.

Embodiment 3

[0034] This embodiment provides a method for preparing lithium-doped, cobalt-supported g-C3N4 photocatalysts, such as figure 1 , including the following steps:

[0035] 1. Disassemble the waste lithium cobalt oxide battery to obtain the positive electrode sheet, and then vacuum pyrolyze the positive electrode sheet at 450°C for 30 minutes to remove the binder to obtain the lithium cobalt oxide positive electrode material;

[0036] 2. Mix the obtained lithium cobalt oxide cathode material with melamine uniformly at a ratio of 3:100, and then perform anaerobic calcination. Control the argon flow rate to 100ml / min, the heating rate to 4°C / min, the reaction temperature to 650°C, and the reaction time to 0.5h;

[0037] 3. The residue after the reaction was treated by ball milling to obtain the photocatalyst. The ball milling conditions were as follows: the rotation speed was 2000 rpm, and the reaction time was 1 h.

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Abstract

The invention discloses a method for preparing a lithium doped and cobalt loaded g-C3N4 photocatalyst. Comprising the following steps: disassembling the waste lithium cobalt oxide battery to obtain a positive plate, and then performing pyrolysis treatment to obtain a positive electrode material; and mixing the obtained positive electrode material with melamine, urea, cyanamide or dicyanodiamine, and then carrying out anaerobic roasting treatment to obtain the lithium-doped and cobalt-loaded g-C3N4 photocatalyst. Compared with the conventional method for preparing the doped and simultaneously loaded g-C3N4 photocatalyst by using high-purity metal salt, the method disclosed by the invention has the advantages of low cost, simple process and the like. Meanwhile, the photocatalyst is prepared by directly utilizing the positive electrode material, so that waste recycling and environmental protection are realized, the performance of the traditional g-C3N4 photocatalyst is improved, and the preparation method has important economic and social benefits.

Description

technical field [0001] The present invention relates to the technical field of recycling waste lithium ion batteries, in particular to a method for preparing lithium-doped and cobalt-loaded g-C3N4 photocatalysts, in particular to a method for preparing lithium-doped lithium cobalt oxide battery cathode materials , Cobalt supported g-C3N4 photocatalyst method. Background technique [0002] At present, the huge social life demand for lithium-ion batteries (LIBs) products has become the norm, which also means that a large number of waste lithium-ion batteries will continue to be produced. From the perspective of sustainable development, it is very important for lithium battery manufacturers to recycle metal resources in waste lithium batteries, especially metals such as lithium and cobalt in positive electrode materials, and then use them in the production of new batteries. Methods for recovering metal resources from waste lithium include hydrometallurgy, pyrometallurgy, biome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCY02W30/84
Inventor 许振明肖杰锋
Owner SHANGHAI JIAO TONG UNIV
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