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A cobalt-nickel bimetallic nitrogen-doped carbon composite containing single-atom active sites

An active site, nitrogen-doped carbon technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of few metal nitrogen carbon materials and the adjustment effect of surface metal doping is not considered, and meet the equipment requirements Low, improve the electrochemical performance, the effect of high yield

Active Publication Date: 2021-06-15
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the anode materials for lithium-ion batteries prepared by using MOFs precursors take advantage of the hollow skeleton structure and the advantages of nitrogen-doped carbon, without considering the further regulation of the surface metal doping on the carbon matrix. There are very few metal nitrogen carbon materials at the site

Method used

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  • A cobalt-nickel bimetallic nitrogen-doped carbon composite containing single-atom active sites
  • A cobalt-nickel bimetallic nitrogen-doped carbon composite containing single-atom active sites
  • A cobalt-nickel bimetallic nitrogen-doped carbon composite containing single-atom active sites

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Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, a method for preparing a cobalt-nickel double-metal nitrogen-doped carbon composite material containing a single-atom active site comprises the following steps:

[0032] 1) 5.95g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 150mL methanol to prepare solution A, 6.16g 2-methylimidazole was dissolved in 150mL methanol solution to prepare solution B; solution A and solution B were mixed and stirred at room temperature for 24 hours, and the obtained The product was centrifuged at 8000rpm for 5min, washed 5 times with methanol, and then dried under vacuum at 70°C;

[0033] 2) fully dissolve the ZIF-8 nanocrystals (0.747g) obtained in step 1) in 150mL methanol for ultrasonic treatment for 5min, and mark it as solution C; then 8.75g Co(NO 3 ) 2 ·6H 2 O and 0.91g DNi were dissolved in 200mL of methanol and ultrasonically treated for 5min, marked as solution D; 9.23g of 2-methylimidazole was dissolved in 50mL of methanol, marked as solution E; then solution D wa...

Embodiment 2

[0038] In this embodiment, a method for preparing a nitrogen-doped carbon composite lithium-ion battery negative electrode material comprises the following steps:

[0039] 1) 5.95g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 150mL of methanol, and then the prepared solution was poured into 150mL of methanol solution containing 6.16g of 2-methylimidazole, mixed and stirred at room temperature for 24h, and the product obtained by the reaction was centrifuged at 8000rpm for 5min , and washed 5 times with methanol, followed by vacuum drying at 70 °C;

[0040] 2) Place the product obtained in step 1) in a tube furnace, heat it to 850°C at a heating rate of 2°C / min, and heat it under flowing N 2 Keep it for 2 hours, and cool it down to room temperature naturally to obtain the product, which is the anode material of nitrogen-doped carbon composite lithium-ion battery (as a comparative material).

[0041] The electrochemical performance test method consistent with that in Example 1 was a...

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Abstract

The invention discloses a method for preparing a cobalt-nickel double-metal nitrogen-doped carbon composite material containing a single-atom active site. Firstly, a ZIF-8 crystal is prepared; then a ZIF-8@DNi-ZIF67 crystal is obtained, which is the MOFs precursor; The MOFs precursor is calcined at high temperature under an inert atmosphere, and then naturally cooled to room temperature; the cooled material is pickled, washed with water several times until neutral, and finally dried. The preparation method takes advantage of the metal-organic framework compound precursor, and the target product can be obtained only through three steps of precursor preparation, calcination, and pickling. The prepared material has high yield, good stability, strong repeatability, and conforms to green Chemical requirements, short production cycle, low equipment requirements, and great application potential. The cobalt-nickel bimetallic nitrogen-doped carbon composite material prepared by the aforementioned method improves the lithium affinity of the material, shortens the diffusion distance of lithium ions and electrons, buffers the volume change during the cycle, and effectively improves the electrical conductivity of the material. chemical properties.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and relates to a cobalt-nickel double-metal nitrogen-doped carbon composite material containing a single-atom active site and its preparation method and application. The nitrogen-doped composite material contains single-atom CoNx and NiNx Active sites have the characteristics of significantly improving the cycle performance and rate performance of lithium-ion batteries. Background technique [0002] Electrochemical energy storage is widely used in rechargeable and dischargeable electronic devices. Lithium-ion batteries have the characteristics of high energy density, light weight, small volume and long life, and have become the current mainstream technology. At the same time, lithium-ion batteries with high specific energy have been It is imperative for electronic terminal equipment to go to the field of electric vehicles, and will play an important role in the sto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王芳于海峰许艳杰冯婷雷建飞
Owner LUOYANG INST OF SCI & TECH
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