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Carbon-coated MnO-Co particles as well as preparation method and application thereof

A carbon coating, mn-co-mof-n technology, applied in the direction of nano-carbon, carbon nanotubes, nanotechnology for materials and surface science, etc., can solve the problem of low material utilization, fast capacity decay, electrochemical High resistance and other problems, to achieve the effect of excellent high temperature cycle performance, small volume expansion effect, and excellent rate performance

Active Publication Date: 2021-05-25
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of transition metal oxides such as poor electrical conductivity, obvious volume expansion effect, fast capacity decay, and poor cycle stability, the practical application has been greatly limited.
The study found that by combining transition metal oxides with one-dimensional highly conductive carbon materials (such as: carbon nanotubes and carbon fibers), or depositing transition metal oxides on carbon substrates (such as: graphene and carbon cloth), get The conductivity of the negative electrode material is enhanced, and the volume expansion effect is reduced, but the conductive paste prepared from the negative electrode material is prone to phase separation during coating, drying and long-term circulation, which will eventually lead to low utilization of the material. Poor electrical conductivity and high electrochemical resistance still cannot be used in practical applications

Method used

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  • Carbon-coated MnO-Co particles as well as preparation method and application thereof
  • Carbon-coated MnO-Co particles as well as preparation method and application thereof
  • Carbon-coated MnO-Co particles as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A carbon-coated MnO-Co particle, the preparation method of which comprises the following steps:

[0055]1) Disperse 4.5mmol of manganese chloride tetrahydrate in 40mL of deionized water to prepare a manganese chloride solution, disperse 3mmol of potassium cobaltcyanide in 40mL of deionized water to prepare a potassium cobaltcyanide solution, and then add chlorine The manganese chloride solution was slowly added to the potassium cobaltcyanide solution, and stirred for 30 minutes, then aged at room temperature for 24 hours, centrifuged, washed with deionized water for 3 times, and vacuum-dried at 70°C for 24 hours to obtain Mn-Co-MOF;

[0056] 2) Disperse the Mn-Co-MOF in a mixed solution consisting of 4mL of ammonia water, 28mL of ethanol and 28mL of deionized water, let it stand for 12h, centrifuge, wash the centrifuged solid with deionized water 3 times, and store at 70°C Vacuum drying for 24 hours to obtain Mn-Co-MOF-N;

[0057] 3) Put the Mn-Co-MOF-N in a nitrogen a...

Embodiment 2

[0090] A carbon-coated MnO-Co particle, the preparation method of which comprises the following steps:

[0091] 1) Disperse 4.2mmol of manganese chloride tetrahydrate in 40mL of deionized water to prepare a manganese chloride solution, disperse 3mmol of potassium cobaltcyanide in 40mL of deionized water to prepare a potassium cobaltcyanide solution, and then add chlorine The manganese chloride solution was slowly added to the potassium cobaltcyanide solution, and stirred for 30 minutes, then aged at room temperature for 24 hours, centrifuged, washed with deionized water for 3 times, and vacuum-dried at 70°C for 24 hours to obtain Mn-Co-MOF;

[0092] 2) Disperse the Mn-Co-MOF in a mixed solution consisting of 4mL of ammonia water, 28mL of ethanol and 28mL of deionized water, let it stand for 14h, centrifuge, wash the centrifuged solid with deionized water 3 times, and store at 70°C Vacuum drying for 24 hours to obtain Mn-Co-MOF-N;

[0093] 3) Put the Mn-Co-MOF in a nitrogen at...

Embodiment 3

[0096] A carbon-coated MnO-Co particle, the preparation method of which comprises the following steps:

[0097] 1) Disperse 4.8mmol of manganese chloride tetrahydrate in 40mL of deionized water to prepare a manganese chloride solution, disperse 3mmol of potassium cobaltcyanide in 40mL of deionized water to prepare a potassium cobaltcyanide solution, and then add chlorine The manganese chloride solution was slowly added to the potassium cobaltcyanide solution, and stirred for 30 minutes, then aged at room temperature for 24 hours, centrifuged, washed with deionized water for 3 times, and vacuum-dried at 70°C for 24 hours to obtain Mn-Co-MOF;

[0098] 2) Disperse the Mn-Co-MOF in a mixture consisting of 4mL of ammonia water, 28mL of ethanol and 28mL of deionized water, let it stand for 10h, centrifuge, wash the centrifuged solid with deionized water 3 times, and store at 70°C Vacuum drying for 24 hours to obtain Mn-Co-MOF-N;

[0099] 3) Put the Mn-Co-MOF in a nitrogen atmospher...

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Abstract

The invention discloses carbon-coated MnO-Co particles as well as a preparation method and application thereof. The carbon-coated MnO-Co particles comprise a plurality of MnO nanoparticles and a plurality of Co nanoparticles which are stacked and packaged in a carbon layer, nitrogen-doped carbon nanotubes grown on the carbon layer, and oxygen vacancies distributed in the MnO nanoparticles. The preparation method of the arbon-coated MnO-Co particles comprises the following steps: 1) carrying out a co-precipitation reaction of manganese salt and cobalt potassium cyanide to prepare Mn-Co-MOF; (2) carrying out pretreatment on the Mn-Co-MOF by using ammonia water, so as to obtain Mn-Co-MOF-N; and (3) calcining the Mn-Co-MOF-N in a protective atmosphere. The carbon-coated MnO-Co particles are high in density and good in conductivity, have the advantages of being excellent in rate capability, excellent in high-temperature cycle performance, small in volume expansion effect, small in capacity fading and the like when being used as a lithium ion battery negative electrode material, and are simple in preparation process and suitable for large-area application.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a carbon-coated MnO-Co particle that can be used as a lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries (LIBs), with their high energy density and long cycle life, have become mainstream energy storage systems (ESSs) for electronics, automotive and grid energy storage, in which electrode material technology is the core technology. Lithium titanate and graphite are anode materials that have been commercially used in large areas at present, but in view of their limitations in electrochemical performance, many researchers are committed to developing anode materials for lithium-ion batteries with better performance. [0003] Transition metal oxides (TMOs) have the advantages of environmental friendliness, abundant natural sources, and high theoretical capacity, and are potential anode materials that can replace lithium ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/38H01M4/583H01M4/62H01M10/0525H01M4/36C01B32/158B82Y40/00B82Y30/00
CPCH01M4/505H01M4/38H01M4/366H01M4/583H01M4/625H01M10/0525C01B32/158B82Y30/00B82Y40/00Y02E60/10
Inventor 林晓明林佳许旋罗一帆
Owner SOUTH CHINA NORMAL UNIVERSITY