Preparation method of 2-amino-anthraquinone modified graphene oxide cathode material for lithium ion battery

A lithium-ion battery, aminoanthraquinone technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low conductivity and insufficient electrochemical characteristics, and achieve low oxidation degree and good cycle stability. The effect of high degree of resistance and oxidation

Active Publication Date: 2018-11-13
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent documents CN1810852B and CN1810854B disclose a method for preparing polyaminoanthraquinone powder by improving the polymerization process. However, most of the currently reported aminoanthraquinone polymers exist in the form of agglomerated stacks, and their electrical conductivity is low. As a result, the excellent electrochemical properties of this type of polymer cannot be fully reflected.

Method used

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  • Preparation method of 2-amino-anthraquinone modified graphene oxide cathode material for lithium ion battery
  • Preparation method of 2-amino-anthraquinone modified graphene oxide cathode material for lithium ion battery
  • Preparation method of 2-amino-anthraquinone modified graphene oxide cathode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment prepares AQGO as follows:

[0034] 1. Preparation of sheet-layer graphene oxide

[0035] Mix 2g graphite powder with 1g NaNO 3 Add the powder into a three-necked flask, and then add 50 mL of concentrated H with a mass concentration of 98%. 2 SO 4 , with magnetic stirring in an ice-water bath, 6g KMnO 4 The solid particles were added to the three-necked flask in batches at 5°C, and after the addition was completed, the temperature was raised to 35°C and stirred for 24 hours; after the reaction, 100mL of deionized water was added to the reaction solution, and 250mL of deionized water was added after mixing evenly, and then Add 15mL of 30wt% hydrogen peroxide dropwise to the reaction solution, then add 200mL of 1mol / L HCl solution, stir and mix evenly, then centrifuge at a speed of 4500r / min, remove the supernatant, wash with water and centrifuge the precipitate until the pH is close to neutral. properties; transfer the centrifuged precipitate to a 500m...

Embodiment 2

[0039] In this example, AQGO was prepared by the same method as in Example 1, except that the mass ratio of sheet-layer graphene oxide to 2-aminoanthraquinone in step 2 was 5:1.

Embodiment 3

[0041]In this example, AQGO was prepared according to the same method as in Example 1, except that the mass ratio of sheet-layer graphene oxide to 2-aminoanthraquinone in step 2 was 2:1.

[0042] figure 1 GO and AQGO prepared for the present invention are 0.1Ag at different current densities -1 , 0.2Ag -1 , 0.5Ag -1 , 1Ag -1 , 2Ag -1 and 5Ag -1 The ratio performance comparison chart. in 5Ag -1 Under high current, AQGO 10:1, AQGO 5:1 and GO anode materials still maintain delithiation specific capacities of 471, 192 and 140mAh / g, and have good stability. After 0.1Ag -1 , 0.2Ag -1 , 0.5Ag -1 , 1Ag -1 , 2Ag -1 and 5Ag -1 After the charge-discharge cycle test at the current density, return to the current density of 0.1Ag -1 , AQGO 10:1, AQGO 5:1 and GO anode material delithiation specific capacity can still return to the initial value, reflecting good structural stability.

[0043] figure 2 Transmission electron microscope (TEM) images of GO and AQGO prepared for t...

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Abstract

The invention discloses a preparation method of a 2-amino-anthraquinone modified graphene oxide cathode material for a lithium ion battery. The preparation method comprises the following steps: firstly, preparing laminated graphene oxide by using an improved Hummers method, carrying out ultrasonic dispersion on the graphene oxide in an N,N-dimethylformamide solution; activating carboxyl group on GO by using carbonyl diimine and N-hydroxysuccinimide, carrying out ultrasonic dispersion on 2-amino-anthraquinone in a DMF solution and dropwise adding into dispersion liquid; charging the obtained mixed solution with nitrogen for reaction, then centrifuging by using ethanol, washing and carrying out freeze-drying to obtain AQGO. The AQGO prepared by the preparation method disclosed by the invention has the characteristics of high conductivity and high specific surface area, and has higher specific capacity and good cycling stability when being used as the cathode material for the lithium-ionbattery. The preparation method has the advantages of simple process, low cost and broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of a 2-aminoanthraquinone modified graphene oxide lithium ion battery negative electrode material. The lithium ion battery negative electrode material synthesized by this method has better cycle performance and charge and discharge capacity, and belongs to the field of lithium ion batteries . Background technique [0002] With the continuous advancement of science and technology, people put forward more and higher requirements on the performance of batteries. The miniaturization and personalized development of electronic equipment requires batteries to have smaller volume and higher specific energy output. Aerospace energy requires batteries to have cycle life, better low temperature charge and discharge performance and higher safety performance. Electric vehicles require batteries with large capacity, low cost, high stability and safety performance. Lithium-ion batteries have the advantages of high ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/587H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 陈鹏鹏胡梦丹周艺峰聂王焰徐颖
Owner ANHUI UNIVERSITY
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