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Graphene-nitrogen doped carbon tube lithium battery electrode material and preparation method thereof

A nitrogen-doped carbon and electrode material technology, applied in battery electrodes, graphene, secondary batteries, etc., can solve the problems of affecting the transmission of lithium ions in graphene, the decline of graphene rate performance, and the single lithium storage mechanism. Effect of suppressing π-π stacking action, improving rate performance, and excellent rate performance

Inactive Publication Date: 2020-03-27
安徽聚科生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as a negative electrode material for lithium-ion batteries, graphene is easy to re-stack together due to van der Waals force, which affects the transmission of lithium ions in graphene, which in turn leads to a decrease in the rate performance of graphene.
In addition, the lithium storage mechanism of pure carbon materials is single, and the upper limit of capacity is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A graphene-nitrogen-doped carbon tube lithium battery electrode material is a composite material of graphene and nitrogen-doped carbon tubes.

[0027] A graphene-nitrogen-doped carbon tube lithium battery electrode material, the preparation method comprising the following steps:

[0028] (1) Graphene oxide was prepared by the improved Hummers method;

[0029] (2) Prepare graphene oxide aqueous solution with a concentration of 3mg / mL;

[0030] (3) Polypyrrole tubes were prepared by the template method, and the template was methyl orange;

[0031] (4) 1 part by mass of graphene and 2 parts by mass of polypyrrole tube are subjected to a hydrothermal reaction at a temperature of 180°C and a reaction time of 15 hours;

[0032] (5) Soak the reaction product in deionized water, freeze and then lyophilize;

[0033] (6) The freeze-dried product was reacted in an argon atmosphere at 650° C. for 2.5 hours to obtain a graphene-nitrogen-doped carbon tube lithium battery electrode...

Embodiment 2

[0035] A graphene-nitrogen-doped carbon tube lithium battery electrode material is a composite material of graphene and nitrogen-doped carbon tubes.

[0036] A graphene-nitrogen-doped carbon tube lithium battery electrode material, the preparation method comprising the following steps:

[0037] (1) Graphene oxide was prepared by the improved Hummers method;

[0038] (2) Prepare graphene oxide aqueous solution with a concentration of 2mg / mL;

[0039] (3) Polypyrrole tubes were prepared by the template method, and the template was methyl orange;

[0040] (4) 1 part by mass of graphene and 0.9 parts by mass of polypyrrole tube were subjected to a hydrothermal reaction at a temperature of 170°C and a reaction time of 18 hours;

[0041] (5) Soak the reaction product in deionized water, freeze and then lyophilize;

[0042] (6) The freeze-dried product was reacted in an argon atmosphere at 700° C. for 3 hours to obtain a graphene-nitrogen-doped carbon tube lithium battery electrod...

Embodiment 3

[0044] A graphene-nitrogen-doped carbon tube lithium battery electrode material is a composite material of graphene and nitrogen-doped carbon tubes.

[0045] A graphene-nitrogen-doped carbon tube lithium battery electrode material, the preparation method comprising the following steps:

[0046] (1) Graphene oxide was prepared by the improved Hummers method;

[0047] (2) Prepare graphene oxide aqueous solution with a concentration of 5mg / mL;

[0048] (3) Polypyrrole tubes were prepared by the template method, and the template was methyl orange;

[0049] (4) 1 part by mass of graphene and 4 parts by mass of polypyrrole tube were subjected to a hydrothermal reaction at a temperature of 190°C and a reaction time of 16 hours;

[0050] (5) Soak the reaction product in deionized water, freeze and then lyophilize;

[0051] (6) The freeze-dried product was reacted in an argon atmosphere at 680° C. for 3 h to obtain a graphene-nitrogen-doped carbon tube lithium battery electrode mate...

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Abstract

The invention discloses a graphene-nitrogen doped carbon tube lithium battery electrode material. The electrode material is a composite material of graphene and a nitrogen doped carbon tube. The preparation method of the graphene and nitrogen-doped carbon tube composite material comprises the following steps: (1) preparing graphene oxide by an improved Hummers method, (2) preparing a graphene oxide aqueous solution, (3) preparing a polypyrrole tube by a template method, (4) adding a polypyrrole tube into the graphene oxide solution, and carrying out hydrothermal reaction, (5) washing, freezingand freeze-drying a reaction product, and (6) annealing the freeze-dried product to obtain the graphene-nitrogen doped carbon tube lithium battery electrode material. The graphene-nitrogen doped carbon tube lithium battery electrode material has the advantages of relatively high capacity, good cycling stability and excellent rate capability.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a graphene-nitrogen-doped carbon tube lithium battery electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long service life, superior safety, environmental friendliness, and small self-discharge, and are considered to be a classic energy source for modern materials and new energy science. With the development of portable, miniaturized and multifunctional electronic devices such as smart phones, especially the arrival of the mobile communication era, there is an urgent need for new high-energy batteries with high energy and environmental friendliness. Therefore, the development of lithium-ion batteries with higher quality and safety is the key to solving energy and environmental problems. [0003] As a lithium ion negative electrode material, graphene has very exce...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/182
CPCH01M4/362H01M4/583H01M4/625H01M10/0525C01B32/182Y02E60/10
Inventor 石帅旗
Owner 安徽聚科生物科技有限公司
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