Cobalt phosphide nanoparticle embedded carbon nanosheet array material as well as preparation and application thereof

A carbon nanosheet and nanoparticle technology, applied in the field of cobalt phosphide nanoparticle inlaid carbon nanosheet array materials, can solve the problems of poor stability, excessive size, unfavorable lithium storage reaction, etc., and achieve the effect of improving electrical conductivity

Inactive Publication Date: 2021-01-05
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent specification whose publication number is CN111525127A discloses a graphene-based cobalt phosphide negative electrode material and its preparation and application. Two-dimensional graphene oxide (GO) is used as the base material, and ZIF-67 is combined with graphene to combine After the composite material is reduced, the obtained airgel is calcined and phosphated to obtain a graphene-coated cobalt phosphide composite material, but the cobalt phosphide synthesized by this method has a large size and is coated in coarse carbon particles , the lithium storage reaction of cobalt phosphide is severely limited
CoP was reported by LihongXue et al. 3

Method used

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  • Cobalt phosphide nanoparticle embedded carbon nanosheet array material as well as preparation and application thereof
  • Cobalt phosphide nanoparticle embedded carbon nanosheet array material as well as preparation and application thereof
  • Cobalt phosphide nanoparticle embedded carbon nanosheet array material as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) The nickel foam is cleaned with dilute hydrochloric acid and deionized water, and dried in vacuum. 0.73g Co(NO 3 ) 2 ·6H 2 O was dissolved in 50mL of deionized water, 1.64g of 2-methylimidazole was dissolved in 50mL of deionized water, the two solutions were quickly mixed, and nickel foam was suspended in the mixed solution at a temperature of 35°C, left to stand for 60min, and then taken out. After washing with deionized water for several times, put it in an oven and dry it at 80°C to obtain ZIF-67 nanosheet array@foam nickel;

[0034] (2) Place the ZIF-67 nanosheet array @ nickel foam obtained in step (1) in a quartz tube furnace, and heat it at a rate of 1°C min under the protection of argon. -1 Heating to 550°C, keeping it warm for 60 minutes, cooling down to room temperature with the furnace, and obtaining cobalt nanoparticle-embedded carbon nanosheet array@foam nickel;

[0035] (3) Embed the cobalt nanoparticle-embedded carbon nanosheet array@foam nickel o...

Embodiment 2

[0042] Nickel foam is cleaned with dilute hydrochloric acid and deionized water, and dried in vacuum. 0.73g Co(NO 3 ) 2 ·6H 2 O was dissolved in 50mL of deionized water, 1.64g of 2-methylimidazole was dissolved in 50mL of deionized water, the two solutions were quickly mixed, and the nickel foam was suspended in the mixed solution at a temperature of 35°C, left to stand for 120min, and then taken out. After washing with deionized water for several times, place it in an oven and dry at 80°C to obtain ZIF-67 nanosheet array@foam nickel; the subsequent process is the same as that in Example 1.

[0043] The microstructure of the product cobalt phosphide nanoparticle-embedded carbon nanosheet array is similar to that of Example 1, the main difference being that the thickness of the carbon nanosheet is changed to 150 nm.

[0044] Adopt the same technology as embodiment 1 to make lithium ion battery negative electrode, assemble into lithium ion battery, with current density 200mA ...

Embodiment 3

[0046] Nickel foam is cleaned with dilute hydrochloric acid and deionized water, and dried in vacuum. 0.73g Co(NO 3 ) 2 ·6H 2 O was dissolved in 50mL of deionized water, 1.64g of 2-methylimidazole was dissolved in 50mL of deionized water, the two solutions were quickly mixed, the nickel foam was suspended in the mixed solution, the solution temperature was 25°C, and stood for 60min, then taken out, After washing with deionized water for several times, place it in an oven and dry at 80°C to obtain ZIF-67 nanosheet array@foam nickel; the subsequent process is the same as that in Example 1.

[0047] The microstructure of the product cobalt phosphide nanoparticle-embedded carbon nanosheet array is similar to that of Example 1, the main difference being that the thickness of the carbon nanosheet is changed to 90nm.

[0048] Adopt the same technology as embodiment 1 to make lithium ion battery negative electrode, assemble into lithium ion battery, with current density 200mA g -1...

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Abstract

The invention discloses a cobalt phosphide nanoparticle inlaid carbon nanosheet array material and a preparation and application thereof in a lithium ion battery negative electrode material. The cobalt phosphide nanoparticles are embedded into the carbon nanosheet array material, and the cobalt phosphide nanoparticles are embedded into the carbon nanosheets to form a jujube cake type composite structure; the carbon nanosheets vertically grow on a surface of the foamed nickel to form an array structure. The preparation method comprises the following steps of firstly, growing the ZIF67 nanosheetarray on the surface of the foamed nickel, and then carbonizing and phosphatizing. According to the preparation method, conductivity, structural stability, cycling stability and electrochemical activity of cobalt phosphide can be improved, so cobalt phosphide has higher charge-discharge capacity and more stable cycling performance. The cobalt phosphide nanoparticle embedded carbon nanosheet arrayhas important application value as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a cobalt phosphide nanoparticle-embedded carbon nanosheet array material and its preparation and application. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and power density, long cycle life, and no memory effect, and are widely used in portable electronic devices and electric vehicles. At present, the negative electrode material of commercial lithium-ion batteries mainly uses graphite, but the theoretical capacity of graphite is only 372mAh g -1 , cannot meet the market demand, and the safety performance of graphite is poor, and the rate performance is low. Therefore, the development of negative electrode materials with higher energy density and better cycle stability is the focus of lithium-ion battery research. [0003] Metal phosphides have a higher specific capacity than graphite and are ideal substitutes for gr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B32/15C01B25/08B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/08C01P2004/03C01P2004/04C01P2004/20C01P2004/64C01P2004/80C01B32/15H01M4/362H01M4/5805H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 严微微
Owner CHINA JILIANG UNIV
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