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A bamboo leaf-like co(oh) 2 /graphene composite electrode material and preparation method thereof

A graphene composite and electrode material technology, which is applied in the field of material chemistry, can solve the problems of poor electrical conductivity and poor cycle stability of metal hydroxides, and overcome poor cycle performance, high specific capacitance, and strong shape controllability Effect

Active Publication Date: 2019-12-03
SHANGHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is environmentally friendly, and the obtained Co(OH) 2 / The graphene two-dimensional hierarchical structure electrode material has a special morphology, and at the same time, it can solve the shortcomings of the metal hydroxide in the prior art, such as poor conductivity and poor cycle stability, thereby improving the overall performance of the electrode material

Method used

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  • A bamboo leaf-like co(oh) <sub>2</sub> /graphene composite electrode material and preparation method thereof
  • A bamboo leaf-like co(oh) <sub>2</sub> /graphene composite electrode material and preparation method thereof
  • A bamboo leaf-like co(oh) <sub>2</sub> /graphene composite electrode material and preparation method thereof

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Effect test

Embodiment 1

[0027] A bamboo leaf-like Co(OH) 2 The preparation method of / graphene composite electrode material comprises the steps:

[0028] (1) Preparation of graphene oxide

[0029] a. Add 5g of graphite flakes and 3.75g of NaNO to a 1L beaker 3 crystals, and added 100ml of concentrated sulfuric acid, stirred with a mechanical stirrer for an hour until the graphite and NaNO 3 well mixed;

[0030] b. Take by weighing 20g potassium permanganate, slowly add in the above-mentioned mixture within one hour, allow it to react for 5 days;

[0031] c. After the reaction is over, add 500ml of deionized water to the system, stir for 2 hours, then slowly add 30ml of 30% hydrogen peroxide, and react for 2 hours;

[0032] d. Centrifuge the above product at 10,000 rpm for 3 to 5 times to remove the impurities in the upper layer and obtain the bottom sediment;

[0033] e. Centrifuge the sediment at 7000rpm to remove the upper impurities, collect the golden translucent honey-like liquid in the midd...

Embodiment 2

[0044] A bamboo leaf-like Co(OH) 2 The preparation method of / graphene composite electrode material comprises the steps:

[0045] (1) Preparation of graphene oxide

[0046] (2) Preparation of Co(OH) 2 / Graphene composite electrode material

[0047] a. Add 20 mg of cobalt nitrate and 1.5 mg / mL graphene oxide (GO) dispersion into 40 ml of deionized water, sonicate for 70 min, then add 2 mg of absolute ethanol and 1.3 mg of DMF to the above mixed solution;

[0048]b. Move the solution obtained in step (a) into a hydrothermal reaction kettle, and react at 170° C. for 20 hours. After the reaction is completed, naturally cool to room temperature to obtain a reaction solution;

[0049] c. Suction filter the reaction solution obtained in step (b), wash with deionized water and absolute ethanol, and finally freeze-dry for 2 days to obtain a two-dimensional bamboo leaf-like Co(OH) 2 / graphene composite electrode material.

[0050] figure 2 , 3 is the resulting two-dimensional ba...

Embodiment 3

[0053] A bamboo leaf-like Co(OH) 2 The preparation method of / graphene composite electrode material comprises the steps:

[0054] (1) Preparation of graphene oxide

[0055] (2) Preparation of Co(OH) 2 / Graphene composite electrode material

[0056] a. Add 20 mg of cobalt nitrate and 1.5 mg / mL graphene oxide (GO) dispersion into 50 ml of deionized water, sonicate for 80 min, then add 2.5 mg of absolute ethanol and 1.5 mg of DMF to the above mixed solution;

[0057] b. Move the solution obtained in step (a) into a hydrothermal reaction kettle, and react at 170° C. for 22 hours. After the reaction is completed, naturally cool to room temperature to obtain a reaction solution;

[0058] c. Suction filter the reaction solution obtained in step (b), wash with deionized water and absolute ethanol, and finally freeze-dry for 2 days to obtain a two-dimensional bamboo leaf-like Co(OH) 2 / graphene composite electrode material.

[0059] Two-dimensional bamboo leaf-like Co(OH) 2 / Grap...

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Abstract

The invention discloses a bamboo-leaf-shaped Co(OH)<2> / graphene composite electrode material and a preparation method therefor. The preparation method specifically comprises the following steps of (1) performing mixing and ultrasonic processing on a cobalt source, graphene oxide GO and deionized water to obtain a mixed solution, and then adding ethyl alcohol and dimethyl formamide DMF to the mixed solution; and (2) moving the solution obtained in the step (1) into a hydrothermal reaction kettle to be subjected to a hydrothermal reaction, after the reaction is completed, performing natural cooling to the room temperature, and then carrying out suction filtration, washing, freezing and drying to obtain the bamboo-leaf-shaped Co(OH)<2> / graphene composite electrode material. The bamboo-leaf-shaped Co(OH)<2> / graphene composite electrode material is obtained by adopting ultrasonic and hydrothermal treatment method, so that the composite electrode material is not only high in thermal stability and crystallization degree but also high in appearance controllability, so that the composite electrode material is one of ideal energy materials.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and relates to a two-dimensional hierarchical structure composite electrode material, in particular to a bamboo leaf-shaped Co(OH) 2 / Graphene composite electrode material and preparation method thereof. Background technique [0002] The increasing energy demand year by year, the increasingly severe environmental situation, and the urgent need for efficient, renewable and clean energy are the three major problems facing human society. Therefore, there is an urgent need for an effective way to solve the above problems, thereby alleviating the large demand for energy by human beings, and at the same time reducing the pollution and damage to the environment caused by human production and life to the greatest extent. Therefore, new energy materials have gradually become the internal motivation and driving force of mainstream energy in the future society. New environmental protection and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M4/86H01M4/90H01M4/88H01G11/24H01G11/30H01G11/36H01G11/86H01L31/0224
CPCH01G11/24H01G11/30H01G11/36H01G11/86H01L31/022425H01M4/362H01M4/523H01M4/62H01M4/625H01M4/8647H01M4/88H01M4/9016H01M4/9083Y02E60/10Y02E60/50
Inventor 蔺华林陈达明王爱民常兴韩生韩治亚陈红艳刘平赵志成周嘉伟薛原许广文陈海军韦焕明何忠义熊丽萍
Owner SHANGHAI INST OF TECH
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