Carbon-based material of graphene-similar three-dimensional porous composite iron oxide, and preparation method

A three-dimensional porous, carbon-based material technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of poor cycle performance, low sulfur utilization, and low sulfur loading, and achieve buffer volume expansion, large pores and ratios Surface area, the effect of increasing sulfur loading

Inactive Publication Date: 2019-10-11
HUBEI UNIV
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Problems solved by technology

[0006] Aiming at the problems of low sulfur load, low sulfur utilization rate, and poor cycle performance in existing lithium-sulfur batteries, the present invention provides a preparation method of a graphene-like three-dimensional porous composite iron oxide carbon-based material and its application in lithium-sulfur batteries. Applications
2. The three-dimensional network structure provides a conductive network and a lithium ion transmission channel, which solves the problem of non-conductivity of sulfur and its reduction products

Method used

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  • Carbon-based material of graphene-similar three-dimensional porous composite iron oxide, and preparation method
  • Carbon-based material of graphene-similar three-dimensional porous composite iron oxide, and preparation method
  • Carbon-based material of graphene-similar three-dimensional porous composite iron oxide, and preparation method

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preparation example Construction

[0030] refer to figure 1 —6, a carbon-based material and preparation method of graphene-like three-dimensional porous composite iron oxide, comprising the following steps:

[0031] (1) Add sodium chloride, carbon source, surfactant and catalyst iron salt into deionized water at room temperature, and stir thoroughly for 2-3 hours to form a uniform and transparent orange solution. A certain amount of catalyst iron salt is put into the deionized water, and 7-8g of sodium chloride, 1-3g of citric acid and 0.2-0.3g of polyvinylpyrrolidone are added to each 40ml of deionized water.

[0032] (2) Put the solution obtained in step (1) in the refrigerator to freeze into ice, then put it into a freeze dryer, take it out after 60-70 hours, and obtain a yellow sample.

[0033] (3) The yellow sample obtained by freeze-drying in step (2) was carbonized at an annealing temperature of 600-700° C. for 3-4 hours under the protection of an inert gas to obtain a black solid powder. The inert gas...

Embodiment example 1

[0037](1) In this example, 7.35g of sodium chloride, 1.25g of citric acid, 0.25g of polyvinylpyrrolidone and 0.32g of ferric chloride hexahydrate were added to 40ml of deionized water at room temperature, and polyvinylpyrrolidone was used as a surfactant and Nitrogen source, stirred well for 2 hours to form a homogeneous transparent orange solution.

[0038] (2) Put the solution obtained in step (1) into ice, put it into a freeze dryer, take it out after 72 hours, and obtain a yellow sample.

[0039] (3) Under the protection of argon, the yellow sample obtained by freeze-drying in step (2) was heated to 650°C at a heating rate of 2°C per minute and carbonized for 3 hours to obtain a black solid powder.

[0040] (4) Disperse the carbonized black powder obtained in step (3) in 100ml of deionized water, filter the sample with a vacuum filtration device, and continuously inject 1000ml of deionized water during the suction filtration process to remove the sodium chloride template, ...

Embodiment 2

[0043] (1) Add 7.35g of sodium chloride, 1.25g of citric acid, 0.25g of polyvinylpyrrolidone and 0.47g of cobalt chloride hexahydrate into 40ml of deionized water at room temperature, with polyvinylpyrrolidone as a surfactant and nitrogen source, and stir well A homogeneous clear pink solution formed in 2 hours.

[0044] (2) Put the solution obtained in step (1) in the refrigerator to freeze into ice, then put it into a freeze dryer, take it out after 72 hours, and obtain a pink sample.

[0045] (3) Under the protection of argon, the yellow sample obtained by freeze-drying in step (2) was heated to 650°C at a heating rate of 2°C per minute and carbonized for 3 hours to obtain a black solid powder.

[0046] (4) Disperse the carbonized black powder obtained in step (3) in 100ml of deionized water, filter the sample with a vacuum filtration device, and continuously inject 1000ml of deionized water during the suction filtration process to remove the sodium chloride template, and t...

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Abstract

The invention discloses a carbon-based material of graphene-similar three-dimensional porous composite iron oxide, and a preparation method. The method comprises the steps of: adding sodium chloride,carbon source, surfactant and catalyst iron salt into deionized water at room temperature; and adequately stirring for 2-3 hours to form uniform and transparent orange solution. A certain amount of catalyst iron salt is added into the deionized water; and, 7-8g sodium chloride, 1-3g citric acid and 0.2-0.3g polyvinylpyrrolidone are added into each 40ml deionized water. The carbon-based material ofgraphene-similar three-dimensional porous composite iron oxide has rich pore structure, big specific surface area and good electrical conductivity, which are good for improving the loading capacity of sulfur and for transmitting the lithium ion and the electron; and thus, the carbon-based material is suitable to be used in the anode of the lithium-sulfur battery.

Description

technical field [0001] The technical invention relates to the technical field of energy materials, in particular to a carbon-based material and a preparation method of a graphene-like three-dimensional porous composite iron oxide, which is mainly used in lithium-sulfur battery cathode materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products, electric vehicles and other equipment. With the development of society, people's demand for high energy density batteries is becoming more and more urgent. At present, commercial lithium-ion batteries generally use graphite as the negative electrode, and lithium iron phosphate, lithium cobalt oxide, and nickel-cobalt-manganese ternary system as the positive electrode material. The theoretical capacity of these positive electrode materials is 150~200mAhg-1, which is difficult to meet the needs of large electrical appliances and The demand for long-life power batteries. Lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/525H01M4/62
CPCH01M4/364H01M4/38H01M4/525H01M4/625Y02E60/10
Inventor 刘建文郭再萍王鹏宇汤虎尤雷
Owner HUBEI UNIV
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