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Ultrathin folded carbon layer coated ZnS composite sandwich material and preparation method and application of ultrathin folded carbon layer coated ZnS composite sandwich material

A technology of interlayer material and carbon layer, which is applied in the field of ultra-thin wrinkled carbon film-coated zinc sulfide composite interlayer material and its preparation, can solve the problems of low conductivity of sulfur and lithium sulfide, complicated preparation process, capacity attenuation, etc., and achieve discharge Excellent capacity, simple process and low cost

Active Publication Date: 2019-12-31
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

However, lithium-sulfur batteries have the following disadvantages in practical applications: 1) the low conductivity of sulfur and lithium sulfide; 2) the large volume change caused by the density difference between the cathode material sulfur and the final product lithium sulfide; 3) polysulfide Rapid capacity fading caused by lithium shuttling (shuttle effect)
[0003] Most of the existing positive electrode materials start with the structural design of carbon materials or the optimization of the conductivity of polar materials. However, the preparation process of these positive electrode materials is complicated and expensive. Therefore, it is necessary to introduce an interlayer material between the positive electrode material and the separator to prevent the shuttle effect. A more efficient and convenient method

Method used

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  • Ultrathin folded carbon layer coated ZnS composite sandwich material and preparation method and application of ultrathin folded carbon layer coated ZnS composite sandwich material
  • Ultrathin folded carbon layer coated ZnS composite sandwich material and preparation method and application of ultrathin folded carbon layer coated ZnS composite sandwich material
  • Ultrathin folded carbon layer coated ZnS composite sandwich material and preparation method and application of ultrathin folded carbon layer coated ZnS composite sandwich material

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preparation example Construction

[0034] like figure 1 As shown, the present invention proposes a kind of preparation method of ultra-thin wrinkled carbon layer coating zinc sulfide composite interlayer material, comprises the steps:

[0035] S1: First, disperse zinc acetate and thiourea in water evenly, then add gum arabic and stir evenly to obtain a mixed solution, heat the mixed solution in a hydrothermal reaction kettle, and obtain zinc sulfide nano-microsphere filter cake after suction filtration and washing;

[0036] S2: Disperse the zinc sulfide nanospheres prepared in S1 in a mixed solution of water, absolute ethanol, and ammonia water, add a certain amount of silicon source and stir for a certain period of time, then add a certain amount of resorcinol and formaldehyde solution, The entire mixed solution was stirred at a certain temperature for a certain period of time to obtain an orange precipitate, which was collected by centrifugation and dried to obtain the first intermediate product;

[0037] S3...

Embodiment 1

[0051] S1: Under stirring, add 0.015mol zinc acetate and 0.03mol thiourea to 100ml aqueous solution in turn, and then add 2g gum arabic to obtain a mixed solution; pour the mixed solution into a tetrafluoroethylene tank and place it in a hydrothermal reaction In the still, at 200°C, react for 30h. After the reaction, let the hydrothermal reaction kettle cool down to room temperature naturally to obtain the reaction product zinc sulfide nanospheres;

[0052] S2: Disperse 0.2g of zinc sulfide nanospheres prepared above in a mixed solution of 10ml of water, 100ml of alcohol, and 5ml of ammonia water, add 5ml of methyl orthosilicate and stir at room temperature for 50min; add 100mg of resorcinol to the above solution and 100 μL formaldehyde solution, and the whole mixed solution was stirred at room temperature for 24 hours to obtain an orange precipitate, which was collected by centrifugation and dried at 80° C. to obtain the first intermediate product;

[0053] S3: carbonizing th...

Embodiment 2

[0056] S1: Under stirring, add 0.015mol zinc acetate and 0.028mol thiourea to 100ml aqueous solution in sequence, then add 1.8g gum arabic to obtain a mixed solution; pour the mixed solution into a tetrafluoroethylene tank and place it in a hydrothermal In the reaction kettle, react at 180°C for 24 hours. After the reaction, let the hydrothermal reaction kettle cool down to room temperature naturally to obtain the reaction product zinc sulfide nanospheres;

[0057] S2: Disperse 0.18g of zinc sulfide nanospheres prepared above in a mixed solution of 10ml of water, 90ml of alcohol, and 4ml of ammonia water, add 4ml of methyl orthosilicate and stir at room temperature for 30min; add 80mg of resorcinol to the above solution and 80 μL formaldehyde solution, and the whole mixed solution was stirred at room temperature for 20 hours to obtain an orange precipitate, which was collected by centrifugation and dried at 80° C. to obtain the first intermediate product;

[0058] S3: carboniz...

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Abstract

The invention discloses an ultrathin folded carbon layer coated zinc sulfide composite sandwich material and a preparation method and an application thereof. The material is composed of zinc sulfide nano microspheres and a carbon layer coated with zinc sulfide on the surface, the average size of the zinc sulfide nano microspheres is 250 nm, the average thickness of the carbon layer is 8 nm, and the carbon layer is in a folded shape similar to a graphene sheet. The preparation method comprises steps of preparing zinc sulfide nano microspheres, dispersing the zinc sulfide nano microspheres in mixed solution of water, absolute ethyl alcohol and ammonia water, adding a silicon source, stirring, adding resorcinol and a formaldehyde solution, and stirring the whole mixed solution at a certain temperature for a certain time to obtain a first intermediate product, carbonizing the first intermediate product in a tubular furnace protection atmosphere at a certain temperature for a certain time to obtain a second intermediate product, etching the second intermediate product with sodium hydroxide solution at a certain temperature for a certain period of time to obtain a final product. The wrinkled ultrathin carbon layer coated zinc sulfide is utilized as a lithium-sulfur battery interlayer material, so high cycling stability and high rate capability are realized.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery diaphragm modified interlayer materials, and in particular relates to an ultra-thin wrinkled carbon film-coated zinc sulfide composite interlayer material and its preparation method and application. Background technique [0002] In recent years, the demand for portable electronic devices with high energy density and long cycle life has increased dramatically, and the energy density of traditional lithium-ion batteries has faced the limit. As a new generation energy storage system with great development prospects, lithium-sulfur battery has attracted much attention because of its advantages of high energy density (2600Wh / kg), high specific capacity (1673mAh / g), low price and non-toxicity. . However, lithium-sulfur batteries have the following disadvantages in practical applications: 1) the low conductivity of sulfur and lithium sulfide; 2) the large volume change caused by the densi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052C01B32/15C01G9/08B82Y40/00
CPCB82Y40/00C01G9/08C01P2004/32C01P2004/62C01P2004/64C01P2004/80C01B32/15H01M4/362H01M4/5815H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 赵世玺陆益铭杨金霖
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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