Polymer and nanometer sulfur composite material with shell and egg yolk structure and preparation method

A composite material and polymer technology, applied in the field of electrochemistry, can solve the problems of active material loss, unstable structure, low electrochemical activity, etc., and achieve the effects of preventing agglomeration, alleviating volume change, and inhibiting dissolution and diffusion

Active Publication Date: 2017-04-26
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to propose a polymer-nano-sulfur composite for lithium-sulfur batteries in view of the problems of low electrochemical activity, unstable stru

Method used

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  • Polymer and nanometer sulfur composite material with shell and egg yolk structure and preparation method
  • Polymer and nanometer sulfur composite material with shell and egg yolk structure and preparation method
  • Polymer and nanometer sulfur composite material with shell and egg yolk structure and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Weigh 15g of sublimed sulfur element and place it in a high-pressure reactor, add 100g of deionized water, raise the temperature to 150°C, control the pressure to 0.5Mpa, stir at high speed or ultrasonically disperse for 2 hours, and obtain an emulsion of elemental sulfur and water.

Embodiment 2

[0089] Weigh 15g of sublimated sulfur and place it in a high-pressure reactor, add 100g of ethylene glycol, raise the temperature to 150°C, control the pressure to 0.1Mpa, stir at high speed or ultrasonically disperse for 2 hours, and obtain an emulsion of elemental sulfur and ethylene glycol.

Embodiment 3

[0091] Carboxylate, sulfonate, benzenesulfonate (such as sodium alkyl carboxylate, sodium tetradecylsulfonate, sodium dodecylbenzenesulfonate, etc.) Anionic surfactant to obtain stable emulsions of sulfur and water solvents.

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Abstract

The invention relates to a polymer and nanometer sulfur composite material with a shell and egg yolk structure and a preparation method of the composite material. The composite material is provided with the shell and egg yolk double-layer structure, a central nucleus is formed by sulfur particles, an outer shell is formed by a polymer, a gap is preserved between the central nucleus and the shell, so that the double-layer structure like an egg shell and an egg yolk is formed; elemental sulfur is shrunk in the process that the temperature is quickly changed by using the change of crystal form and the change of density in different temperatures, and the elemental sulfur is partially dissolved and separated out by using a solvent, so that the composite material of the shell and egg yolk structure is formed. The composite material of the structure is applicable to cathodes of lithium sulfur batteries, structure collapse caused by volume expansion in the discharge process of the elemental sulfur is relieved, the dissolution and loss of discharge products are inhibited, and the electrical conductivity and circularity of the material are improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a polymer-nanometer sulfur composite material with a shell-egg yolk structure and a preparation method. Background technique [0002] Lithium secondary batteries play a vital role in important strategic fields such as electric vehicles, power tools, smart grids, distributed energy systems, and national defense. Improving the energy density of batteries has always been one of the themes in the research and development of lithium secondary batteries. However, after more than 20 years of development, the lithium-ion battery has basically reached its theoretical energy density limit, and its development space is very limited. At the same time, in order to solve energy and pollution problems, the global upsurge of the electric vehicle industry has risen again, and electric vehicles have become a new green industry actively promoted by the Chinese government. However, the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/38H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 弓胜民王耀焦灿张立赵尚骞杨容李久铭孙浩博卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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