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A kind of graphene nanoribbon material and its preparation method and application

A nano-ribbon, graphene technology, applied in the direction of graphene nano-ribbon, graphene, nano-carbon, etc., can solve problems such as hindering lithium ion transmission, achieve lithium storage performance and lithium ion transmission rate improvement, increase specific surface area, The effect of high specific capacity

Active Publication Date: 2021-04-30
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the diffusion barrier of lithium ions crossing graphene vertically is as high as 9eV [ACSAppl.

Method used

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  • A kind of graphene nanoribbon material and its preparation method and application
  • A kind of graphene nanoribbon material and its preparation method and application
  • A kind of graphene nanoribbon material and its preparation method and application

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[0034] As an aspect of the technical solution of the present invention, what it relates to is a kind of preparation method of graphene nanoribbon material, and it comprises:

[0035] The carbon nanotubes are oxidized and stripped longitudinally by the Hummers method to form a graphene oxide nanoribbon solution;

[0036] Directional freeze-drying is performed on the graphene oxide nano-ribbon solution to obtain a structured and ordered flocculent graphene oxide nano-ribbon material.

[0037] In some embodiments, the preparation method includes: reacting a mixed reaction system comprising carbon nanotubes, concentrated sulfuric acid, phosphoric acid, and an oxidizing agent at 60-80° C. for 1-3 hours to form a graphene oxide nanoribbon solution.

[0038] Further, the preparation method specifically includes: adding carbon nanotubes into concentrated sulfuric acid and stirring for 1-3 hours, and then sequentially adding phosphoric acid and an oxidizing agent to form the mixed reac...

Embodiment 1

[0067] The preparation technology of graphene nano strip material in the present embodiment comprises the steps:

[0068] 1) Add 1 g of multi-walled carbon nanotubes (5-20 μm in length and 45 nm in average diameter) into 250 mL of concentrated sulfuric acid solution, stir at room temperature for 2 h; add 28 mL of phosphoric acid solution dropwise at a constant speed within 30 min, and add 6 g of potassium permanganate at 2 g / Add the mixed solution at a speed of h, and stir at room temperature for 1 hour; heat to 70°C and stir for 2 hours, then cool to room temperature naturally; slowly pour the mixed solution into 400 mL of 0.73% hydrogen peroxide solution in an ice-water bath, overnight; use 5 wt % hydrochloric acid solution for centrifugal washing and dialysis for 10 days.

[0069] 2) Sonicate the graphene oxide nanostrip solution obtained after dialysis for 1 hour, quickly immerse the 50mL needle tube with the built-in graphene oxide nanostrip solution in liquid nitrogen a...

Embodiment 2

[0072] The preparation technology of graphene nano strip material in the present embodiment comprises the steps:

[0073] 1) Add 1 g of multi-walled carbon nanotubes (5-20 μm in length and 45 nm in average diameter) into 250 mL of concentrated sulfuric acid solution, stir at room temperature for 2 h; add 28 mL of phosphoric acid solution dropwise at a constant speed within 30 min, and add 6 g of potassium permanganate at 2 g / Add the mixed solution at a speed of h, and stir at room temperature for 1 hour; heat to 70°C and stir for 2 hours, then cool to room temperature naturally; slowly pour the mixed solution into 400 mL of 0.73% hydrogen peroxide solution in an ice-water bath, overnight; use 5 wt % hydrochloric acid solution for centrifugal washing and dialysis for 10 days.

[0074] 2) Sonicate the graphene oxide nanostrip solution obtained after dialysis for 1 hour, and slowly immerse the 50mL needle tube with the built-in graphene oxide nanostrip solution in liquid nitroge...

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Abstract

The invention discloses a graphene nano strip material, a preparation method and application thereof. The preparation method comprises: using the Hummers method to longitudinally oxidize and strip the carbon nanotubes to form a graphene oxide nanostrip solution; to perform directional freeze-drying on the graphene oxide nanostrip solution to obtain a flocculent oxidized carbon nanotube with an ordered structure. Graphene nanoribbon materials. The process of the present invention is simple, and the obtained graphene nano strip material has a three-dimensional porous structure, a large specific surface area and a large amount of oxygen-containing functional groups that are beneficial to lithium storage, and the lithium ion battery negative electrode prepared from this material has a high specific capacity (500 ‑650mAh / g), superior electrochemical performance and good rate performance, it is an ideal battery anode material.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and its preparation process, in particular to a graphene nano-strip material, its preparation method and its application in lithium-ion battery negative electrode materials and lithium-ion batteries, belonging to lithium-ion battery technology field. Background technique [0002] With the rapid development of human society and the increasing demand for energy, the storage capacity of non-renewable energy such as coal, oil, and natural gas has decreased sharply. It has become a top priority to find new renewable and clean energy. Lithium-ion batteries stand out as specific energy and efficiency due to their superior performance. Highest secondary battery type. In 1990, Tazawa and others began to use carbon materials as negative electrodes, and lithium-transition metal compounds as positive electrodes to prepare lithium-ion batteries. Carbon materials, as anode materials for lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19H01M4/587H01M10/0525
CPCC01B2204/06H01M4/587H01M10/0525Y02E60/10
Inventor 刘立伟钱雨婷李奇王汝冰刘丰奎李伟伟
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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