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a fes 2 Preparation method and application of composite material with s

A technology for composite materials and cathode materials, which is applied in the field of preparation of FeS2 and S composite materials, can solve problems such as the shuttle effect, achieve the effects of reducing the shuttle effect, simple preparation method, and low raw material price

Active Publication Date: 2020-07-28
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a FeS 2 The preparation method and application of the S composite material, the method first uses the solution method to prepare Fe-ZIF, and then prepares FeS by high-temperature calcination and vulcanization 2 Hollow spheres, and finally the FeS 2 Preparation of FeS by compounding hollow spheres with sulfur 2 and S composites

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  • a fes <sub>2</sub> Preparation method and application of composite material with s
  • a fes <sub>2</sub> Preparation method and application of composite material with s
  • a fes <sub>2</sub> Preparation method and application of composite material with s

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specific Embodiment approach 1

[0019] Specific embodiment 1: This embodiment describes a kind of FeS 2 And the preparation method of S composite material, described method step is as follows:

[0020] Step 1: Take 1-10 mmol of iron salt and add it to 25-250 mL of methanol and stir to fully dissolve it, which is recorded as solution 1; take 4-40 mmol of 2-methylimidazole and 0.3-1.5 g of polyvinylpyrrolidone (PVP) Add it into 25 mL of methanol and stir to fully dissolve it, and record it as solution 2; add the above solution 1 dropwise into solution 2 and stir for 5-10 minutes, then let it stand for 12-48 hours, and centrifuge at a speed of 8000-10000r / min for 5- Collect the precipitate for 10 minutes, wash it with methanol for 5 times, put it in a drying oven, and dry it at 60-70°C for 24 hours to obtain the iron-based zeolite-type imidazole framework compound (Fe-ZIF);

[0021] Step 2: Take the iron-based zeolite-type imidazole framework compound and elemental sulfur prepared in step 1 according to the ma...

specific Embodiment approach 2

[0023] Specific embodiment two: a kind of FeS described in specific embodiment one 2 and the preparation method of S composite material, in step 1, described iron salt is FeSO 4 •7H 2 O, FeCl 2 4H 2 O or Fe(NO 3 ) 2 ·6H 2 One of O.

specific Embodiment approach 3

[0024] Specific embodiment three: a kind of FeS described in specific embodiment one 2 and S composite materials, in step 2, the heating rate before 400°C is 1°C / min, 2°C / min or 5°C / min, and the heating rate between 400 and 500°C is 5°C / min or 10°C °C / min.

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Abstract

The invention discloses a preparation method and an application of a FeS2 and S composite material, and belongs to the technical field of energy materials. The method includes the steps: (1) mixing ferric salt solution and organic ligand solution to prepare a Fe-based zeolite imidazole frame compound (Fe-ZIF); (2) mixing the prepared Fe-ZIF and sulfur, and calcining mixture in a tube furnace at high temperature to obtain hollow FeS2 balls; (3) mixing the hollow FeS2 balls and elemental sulfur, heating and smelting mixture under protection of inert gas, and cooling the mixture to reach the indoor temperature to obtain the FeS2-S composite material. The preparation method has the advantages that the FeS2 serves as positive electrode materials of lithium-sulfur batteries and has high chemicaladsorption effects on discharge intermediate polysulfide lithium of the lithium-sulfur batteries, namely, dissolution of the polysulfide lithium is restrained by the aid of Lewis acid and base actions of the FeS2 and polysulfide ions, shuttle effects are reduced, and decomposition of the polysulfide lithium can be catalyzed by the FeS2, so that battery performances are improved. The preparation method is simple, low in raw material cost and pollution-free in process.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a FeS 2 The preparation method and application of S and S composite materials. Background technique [0002] A lithium-sulfur battery uses elemental sulfur as the positive electrode active material and metal lithium as the negative electrode material. The total reaction of the battery is as follows: . From this calculation, its theoretical energy density is as high as 2600 Wh / kg, which is much higher than the current commercial lithium-ion batteries. Moreover, sulfur is abundant in the earth's crust, and has the advantages of low price and environmental friendliness. Therefore, lithium-sulfur batteries are a kind of lithium batteries with good application prospects. However, lithium-sulfur batteries also have their inherent problems that need to be overcome, such as the low conductivity of elemental sulfur, which affects the battery rate performance; the intermediate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/052
CPCH01M4/362H01M4/38H01M4/5815H01M10/052Y02E60/10
Inventor 孙克宁都颖武鹤显范立双张乃庆
Owner HARBIN INST OF TECH
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