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A kind of preparation method and application of iron oxide, ferrous sulfide and sulfur composite material

A technology of ferrous disulfide and composite materials, which is applied to structural parts, electrical components, battery electrodes, etc., can solve the problems of loss of electroactive substances, and achieve the effects of improved stability, easy price, and good catalytic effect

Active Publication Date: 2020-05-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Long-chain lithium polysulfide Li 2 S x (4≤x≤8) easily soluble in ester electrolytes, resulting in loss of electroactive substances

Method used

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  • A kind of preparation method and application of iron oxide, ferrous sulfide and sulfur composite material
  • A kind of preparation method and application of iron oxide, ferrous sulfide and sulfur composite material
  • A kind of preparation method and application of iron oxide, ferrous sulfide and sulfur composite material

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specific Embodiment approach 1

[0023] Specific embodiment one: what this embodiment records is a kind of preparation method of iron oxide, ferrous disulfide and sulfur composite material, and described method step is as follows:

[0024] Step 1: Add 1-5 mmol FeSO 4 •7H 2 O was added to 25-100 mL of methanol and stirred to fully dissolve, which was recorded as solution 1; 4-20 mmol of 2-methylimidazole and 0.3-1.5 g of polyvinylpyrrolidone were added to 25 mL of methanol and stirred to fully dissolve, Record it as solution 2; slowly add the above solution 1 into solution 2, stir for 5-20 min, then let it stand for 24 h, centrifuge at 8000-10000r / min for 5-10 min to collect the precipitate, wash it with methanol for 5 times, put it in a dry In the oven, dry at a temperature of 40-100 ℃ for 6-48 h to obtain Fe-metal organic framework materials (Fe-MOFs);

[0025] Step 2: Put the Fe-metal organic framework material prepared in Step 1 in a tube furnace, heat up to 400-600°C under air conditions, and keep it wa...

specific Embodiment approach 2

[0028] Specific embodiment two: the preparation method of a kind of iron oxide, ferrous disulfide and sulfur composite material described in specific embodiment one, in step two, the rate when heating up is 2 ℃ / min, 5 ℃ / min or 10 ℃ / min.

specific Embodiment approach 3

[0029] Specific embodiment three: the preparation method of a kind of iron oxide, ferrous sulfide and sulfur composite material described in specific embodiment one, in step three and step four, described elemental sulfur is sublimated sulfur, settled sulfur, refined sulfur kind of.

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Abstract

Belonging to the technical field of energy materials, the invention provides a preparation method and application of an iron oxide, ferrous disulfide and sulfur composite material. The method includesthe steps of: (1) using a solution method to prepare an Fe-metal organic framework material; (2) calcining the dried Fe-metal organic framework material in the air to obtain iron oxide hollow spheres; (3) mixing the iron oxide hollow spheres obtained in step (2) with elemental sulfur, in an inert gas-reducing gas, carrying out certain programmed heating steps to obtain iron oxide and ferrous disulfide materials; and (4) mixing the materials prepared in step (3) with elemental sulfur, performing heating to melting, and then conducting cooling to room temperature, thus obtaining the iron oxide,ferrous disulfide and sulfur composite material. According to the invention, the used raw materials are easily available and low in price, the preparation method is simple, and the process is clean and environment-friendly. And the porous structure of the composite material can buffer the volume change of elemental sulfur in the charging-discharging process, thereby improving the battery performance.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a preparation method and application of iron oxide, ferrous disulfide and sulfur composite materials. Background technique [0002] In recent years, with the continuous improvement of people's demand for consumer electronics and pure electric vehicles, the research and development and production of energy storage devices with high energy density, long cycle life and low price have become crucial. Lithium-sulfur batteries, due to their advantages in electrode materials and energy storage mechanisms, can better meet future consumer demand in terms of energy density and price compared with existing lithium battery technologies. However, the practical application of lithium-sulfur batteries still faces many challenges, including how to solve the problem of rapid capacity decay during charging and discharging. [0003] The overall reaction of the lithium-sulfur b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/364Y02E60/10
Inventor 孙克宁都颖武鹤显范立双张乃庆
Owner HARBIN INST OF TECH
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