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Preparation method of flaky nanometer FeS2/C negative electrode material

A negative electrode material and nanotechnology, which is applied in the field of preparation of sheet-like nano FeS2/C negative electrode materials for lithium ion batteries, can solve the problems of low discharge capacity of electrode materials, and achieve uniform product shape and size, high ion transmission speed, The effect of improving ionic conductivity

Active Publication Date: 2018-01-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is simple, but the discharge capacity of the prepared electrode material is low, and there is still room for improvement

Method used

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  • Preparation method of flaky nanometer FeS2/C negative electrode material
  • Preparation method of flaky nanometer FeS2/C negative electrode material
  • Preparation method of flaky nanometer FeS2/C negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment includes the following steps:

[0034] (1) Dissolve 4 mmol of fumaric acid and 4 mmol of ferric chloride hexahydrate in 40 mL of deionized water, and stir for 1 hour to obtain a homogeneous solution.

[0035] (2) Put the homogeneous solution obtained in step (1) into a 100 mL stainless steel reaction kettle lined with polytetrafluoroethylene, put it in a drying oven, and conduct a hydrothermal reaction at 120°C for 15 hours, then naturally cool to room temperature , filtered, washed the precipitate four times with absolute ethanol and deionized water, and dried in an oven at 60°C for 24 h to obtain 1.0 g of yellow powder.

[0036] (3) Disperse 1.0g of yellow powder obtained in step (2) and 4.0g of thioacetamide in 60ml of ethanol solution; place the resulting solution in a 100 mL stainless steel reactor lined with polytetrafluoroethylene, and put it in a dry The hydrothermal reaction was carried out at 180 °C for 12 h in the oven, then naturally cooled ...

Embodiment 2

[0044] This embodiment includes the following steps:

[0045] (1) Dissolve 8 mmol of trimesic acid and 4 mmol of ferric nitrate nonahydrate in 60 mL of N,N-dimethylformamide, and stir for 1 hour to obtain a homogeneous solution.

[0046] (2) Put the homogeneous solution obtained in step (1) into a 100 mL stainless steel reaction kettle lined with polytetrafluoroethylene, put it in a drying oven, and conduct a hydrothermal reaction at 150°C for 10 hours, then cool it naturally to room temperature , filtered, washed the precipitate four times with absolute ethanol and deionized water, and dried in an oven at 60 °C for 12 h to obtain a red powder.

[0047] (3) Disperse 1.0 g of the red powder obtained in step (2) and 4.0 g of thioacetamide in 60 ml of ethanol solution, place the resulting solution in a 100 mL stainless steel reactor lined with polytetrafluoroethylene, and put it in a dry The hydrothermal reaction was carried out at 120 °C for 16 h in the oven, then naturally coo...

Embodiment 3

[0054] This embodiment includes the following steps:

[0055] (1) Dissolve 2mmol of terephthalic acid and 4mmol of ferric nitrate nonahydrate in 60mL of N,N-dimethylformamide, and stir for 1 hour to obtain a homogeneous solution.

[0056] (2) Put the homogeneous solution obtained in step (1) into a 100 mL stainless steel reaction kettle lined with polytetrafluoroethylene, put it in a drying oven, and conduct a hydrothermal reaction at 150°C for 10 hours, then cool it naturally to room temperature , filtered, washed the precipitate four times with absolute ethanol and deionized water, and dried in an oven at 60 °C for 12 h to obtain a yellow powder.

[0057] (3) Disperse 1.0g of yellow powder obtained in step (2) and 4.0g of thioacetamide in 60ml of ethanol solution; place the resulting solution in a 100 mL stainless steel reactor lined with polytetrafluoroethylene, and put it in a dry The hydrothermal reaction was carried out at 120 °C for 16 h in the oven, then naturally coo...

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Abstract

The invention discloses a preparation method of a flaky nanometer FeS2 / C negative electrode material. The preparation method comprises the following steps: (1) dissolving an iron source and an organicligand into a solvent I, and stirring uniformly to obtain a homogeneous solution; (2) performing a hydrothermal reaction on the homogeneous solution obtained in the step (1), naturally cooling to room temperature, filtering, washing, depositing and drying to obtain yellow or red powder; (3) dispersing the yellow or red powder obtained in the step (2) and a sulfur source compound in a solvent II in the mass ratio of 1:(3 to 4), performing a hydrothermal reaction on mixed solution, natural cooling to room temperature, filtering, washing, precipitating and drying to obtain black powder; and (4)calcining the black powder obtained in the step (3) in a protective atmosphere, and cooling to room temperature to obtain the flaky nanometer FeS2 / C negative electrode material. The obtained flaky nanometer FeS2 / C negative electrode material is uniform in shape and size. A carbon material can be effectively compounded with ferrous sulfide, so that the ionic conductivity and electronic conductivityof the material are increased. The two-dimensional structure has the characteristics of shorter diffusion distance of lithium ions, high transmission rate, high specific surface area, high conductivity, high ion transmission speed and the like.

Description

technical field [0001] The invention relates to a preparation method of a flaky nano FeS2 / C negative electrode material, in particular to a preparation method of a flaky nano FeS2 / C negative electrode material for a lithium ion battery. Background technique [0002] As the application range of lithium-ion batteries gradually expands to the range of power batteries, the requirements for its energy density are also getting higher and higher. Due to the abundant natural resources of metal sulfides and their high energy density when used as anodes, researchers have conducted extensive studies on the energy storage of metal sulfides and their conversion mechanisms in lithium-ion batteries. Among various metal sulfides, FeS2 has a higher theoretical capacity (894 mAh g -1 ), and has attracted much attention because of its environmental friendliness. [0003] CN 102760877 B discloses a transition metal sulfide / graphene composite material and its preparation method and application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 童汇姚赢赢张宝陈核章王旭董鹏远郑俊超喻万景张佳峰
Owner CENT SOUTH UNIV
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