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Preparation method and application of carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with heterojunction structure

A technology of carbon nanofiber and tin disulfide, which is applied in the direction of nanotechnology, nanotechnology, structural parts, etc. for materials and surface science, can solve problems such as lithium polysulfide shuttle effect, and achieve clean and environmentally friendly preparation process and high production process Simple, transformative effect

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

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the lithium polysulfide shuttle effect existing in lithium-sulfur batteries, and to provide a preparation method and application of carbon nanofibers, tin disulfide, tin dioxide and sulfur composite materials with a heterojunction structure

Method used

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  • Preparation method and application of carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with heterojunction structure
  • Preparation method and application of carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with heterojunction structure
  • Preparation method and application of carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with heterojunction structure

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specific Embodiment approach 1

[0021] Specific embodiment one: what this embodiment records is a kind of preparation method of carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with heterojunction structure, described method steps are as follows:

[0022] Step 1: Dissolve 16 mg of thioacetamide and 32-80 mg of tin tetrachloride in 10 mL of isopropanol, add carbon nanofibers with a diameter of 1 cm, react in hydrothermal reaction at 180 ° C for 24 hours, and cool naturally to room temperature. Dry overnight at a temperature of 70°C to obtain a carbon nanofiber, tin disulfide and tin dioxide composite material with a heterojunction structure;

[0023] Step 2: Dissolve 200-400 mg of sulfur powder in 5 mL of carbon disulfide to obtain a sulfur solution, and impregnate the carbon nanofibers, tin disulfide and tin dioxide composite materials with a heterojunction structure in step 1 into the sulfur solution to make the sulfur The loading capacity is 1.5-3.0mg cm -2 After 5 minutes, it wa...

specific Embodiment approach 2

[0024] Specific embodiment two: a method for preparing a carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with a heterojunction structure described in specific embodiment one, the carbon nanofiber, tin disulfide and disulfide The morphology of tin oxide is a nanosheet array structure with a rough surface.

specific Embodiment approach 3

[0025] Embodiment 3: Application of the carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material prepared by the method described in Embodiment 1 or 2 in the positive electrode of lithium-sulfur battery.

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Abstract

The invention relates to a preparation method and application of a carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with a heterojunction structure, and belongs to the technical field of an energy material. The method comprises the following steps: 1, dissolving tin tetrachloride, thioacetamide and carbon nanofiber into polypropyl alcohol and performing hydrothermal reaction to obtain a carbon nanofiber, tin disulfide and tin dioxide composite material with the heterojunction structure; 2, dipping the composite material obtained in the step 1 into a sulfur solution, taking out after 5 minutes, vacuum-drying and calcining at high temperature to obtain the carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with the heterojunction structure. The preparation method and the application of the carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with the heterojunction structure have the following advantages: the composite material has special interface effect, can effectively increase electrode surface electron and ion transmission speed and is favorable for realize efficient utilization of the sulfur and obtainingthe cyclic stable lithium sulfur battery. The composite material can be prepared by directly utilizing a one-step hydrothermal method, the preparation method is simple and practical, and the components are controllable.

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 a carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with a heterojunction structure. Background technique [0002] With the development of the portable electronics industry, the demand for high specific energy batteries is more urgent, limited by the specific capacity of traditional lithium cobalt oxide, lithium manganese oxide and other materials, lithium ion batteries can no longer meet the current demand. It is imperative to seek a secondary battery with higher specific capacity. Lithium-sulfur batteries have attracted the attention of researchers in recent years. Due to their high specific capacity (1675mAh / g), low cost, wide source of elemental sulfur, and non-toxicity, they are expected to become the next generation of high specific energy secondary battery systems. . [0003] However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/583H01M10/052H01M4/13B82Y30/00
CPCB82Y30/00H01M4/13H01M4/362H01M4/38H01M4/48H01M4/5815H01M4/583H01M10/052Y02E60/10
Inventor 孙克宁王茂旭张乃庆范立双
Owner HARBIN INST OF TECH
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