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Three-dimensional porous carbon material with carbon nanotubes vertically grown on multilayer graphene surface, preparation method and lithium ion battery applying material

A multi-layer graphene and graphene surface technology, applied in the direction of batteries, battery electrodes, secondary batteries, etc., can solve the problems of low density of carbon nanotubes, large diameter of carbon nanotubes, and low distribution density, so as to improve electron transmission Good performance, good crystallinity, and improved storage capacity

Active Publication Date: 2016-09-21
杭州中盟智控科技集团有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The existing method is to use chemical methods to deposit catalysts on the surface of graphene, but the distribution density of deposition is low, therefore, the density of carbon nanotubes on the surface of graphene is very low
There are existing applications for the preparation of Co on the surface of multilayer graphene 3 o 4 Catalyst to prepare carbon nanotubes by CVD method, but cobalt element belongs to the national strategic reserve material, at the same time, cobalt has certain toxicity, and the diameter of carbon nanotubes prepared by cobalt is too large, and the density distributed on the surface of graphene is relatively low

Method used

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  • Three-dimensional porous carbon material with carbon nanotubes vertically grown on multilayer graphene surface, preparation method and lithium ion battery applying material
  • Three-dimensional porous carbon material with carbon nanotubes vertically grown on multilayer graphene surface, preparation method and lithium ion battery applying material
  • Three-dimensional porous carbon material with carbon nanotubes vertically grown on multilayer graphene surface, preparation method and lithium ion battery applying material

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Embodiment 1

[0056] 8mlDMF and 2ml distilled water are mixed as mixed solvent, add 7mg expanded graphite in mixed solvent, ultrasonic vibration 2 hours, obtain the required multilayer graphene of the present invention, wherein DMF: distilled water volume ratio is 8: 2, expanded graphite is relative to mixed The solvent volume is 0.7mg / ml, and its scanning electron microscope picture is as follows image 3 shown. Add 180mg NaAc, 72mg Fe(Cl) to the mixed solution 2 4H 2 O and 59 mg Mn(Ac) 2 4H 2 O, Mn(Ac) 2 4H 2 Manganese atom in O and Fe(Cl) 2 4H 2 The molar ratio of iron atoms in O is 3:2, the concentration of NaAc is 0.22mol / L, Fe(Cl) 2 4H 2 The molar ratio of O relative to the mixed solvent was 36mmol / L, and stirred for 5 minutes; the solution was poured into the hydrothermal reactor, so that the filling degree of the solution in the hydrothermal reactor was 30%. Keep warm at 100°C for 2 hours and then cool to room temperature; take out the reactant from the hydrothermal reacti...

Embodiment 2

[0060] Measure 8ml of DMF and 2ml of distilled water and mix them as a mixed solvent, add 8mg of expanded graphite to the mixed solvent, and ultrasonically vibrate for 3 hours to obtain the multilayer graphene required by the present invention. Among them, the volume ratio of DMF:distilled water is 8:2, the volume of expanded graphite relative to the mixed solvent is 0.8mg / ml, and 170mgNaAc, 48mgFe(Cl) are added to the mixed solution 2 4H 2 O and 89mgMn(Ac) 2 4H 2 O, Mn(Ac) 2 4H 2 Manganese atom in O and Fe(Cl) 2 4H 2 The molar ratio of iron atoms in O is 2:3, the concentration of NaAc is 0.21mol / L, Fe(Cl) 24H 2 The molar ratio of O relative to the mixed solvent was 24mmol / L, and stirred for 4 minutes; the solution was poured into the hydrothermal reactor, so that the filling degree of the solution in the hydrothermal reactor was 30%. Keep warm at 100°C for 2 hours and then cool to room temperature; take out the reactant from the hydrothermal reaction kettle, use disti...

Embodiment 3

[0065] Measure 8ml of DMF and 2ml of distilled water and mix them as a mixed solvent, add 9mg of expanded graphite to the mixed solvent, and ultrasonically vibrate for 4 hours to obtain the multilayer graphene required by the present invention. Among them, the volume ratio of DMF:distilled water is 8:2, the volume of expanded graphite relative to the mixed solvent is 0.9mg / ml, and 160mgNaAc, 24mgFe(Cl) are added to the mixed solution 2 4H 2 O and 118mgMn(Ac) 2 4H 2 O, Mn(Ac) 2 4H 2 Manganese atom in O and Fe(Cl) 2 4H 2 The molar ratio of iron atoms in O is 4:1, the concentration of NaAc is 0.20mol / L, Fe(Cl) 2 4H 2 The molar ratio of O relative to the mixed solvent was 12mmol / L, and stirred for 6 minutes; the solution was poured into the hydrothermal reactor, so that the filling degree of the solution in the hydrothermal reactor was 30%. Keep warm at 100°C for 2 hours and then cool to room temperature; take out the reactant from the hydrothermal reaction kettle, use dis...

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Abstract

Embodiments of the invention disclose a three-dimensional porous carbon material with carbon nanotubes vertically grown on a multilayer graphene surface, a preparation method and a lithium ion battery applying the material, wherein the preparation method of the three-dimensional porous carbon material with the carbon nanotubes vertically grown on the multilayer graphene surface comprises the following steps: S10, utilizing a pi-pi action to deposit iron and manganese oxide nanoparticles distributed at high density on a graphene surface; and S20, enabling nanotubes to vertically grow on the graphene surface by utilizing a chemical vapor deposition method, thereby obtaining the three-dimensional porous carbon material. The three-dimensional porous carbon material prepared by the preparation method can solve an agglomeration problem of the graphene and the nanotubes during drying; when as a negative electrode of a lithium ion battery, the three-dimensional porous carbon material has three-dimensional carbon grids capable of effectively improving electron conductivity of the carbon material; due to the porosity, ion transfer capability can be improved, and lithium ion storage capability of the nanotubes and the graphene is fully exerted.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and particularly relates to a three-dimensional porous carbon material, a preparation method and a lithium-ion battery using the same. The three-dimensional porous carbon material is composed of multilayer graphene and vertically grown on the surface of multilayer graphene Composed of multi-walled carbon nanotubes with high distribution density, the prepared three-dimensional porous carbon material has excellent lithium storage performance and can be applied to lithium-ion battery anode materials. Background technique [0002] With the development of electric bicycles and electric vehicles, higher requirements are put forward for the capacity performance, rate performance and service life of lithium-ion batteries. At present, the negative electrode of commercial lithium batteries mainly uses graphite, whose theoretical capacity can only reach 372mAh / g, and the rate...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M10/0525H01M2220/20Y02E60/10
Inventor 徐军明周林志宋开新武军张森李从文李强
Owner 杭州中盟智控科技集团有限公司
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