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Macroporous structural lithium-sulfur secondary cell and preparation method thereof

A lithium-sulfur secondary battery and pore structure technology, which is applied in the manufacture of secondary batteries, lithium storage batteries, and electrolyte storage batteries, can solve the problems of insufficient utilization of active materials, not very ideal, etc., to improve the stability of charge and discharge, The effect of increasing speed and improving stability

Active Publication Date: 2014-10-22
湖州优研知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents have improved the conductivity and cycle stability of sulfur cathode materials to a certain extent, but they are still not ideal, and the utilization rate of active materials is not high enough, and further improvement is needed

Method used

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  • Macroporous structural lithium-sulfur secondary cell and preparation method thereof
  • Macroporous structural lithium-sulfur secondary cell and preparation method thereof
  • Macroporous structural lithium-sulfur secondary cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1 Preparation of three-dimensional skeleton polymer template: Mix epoxy resin (brand E-44) and polyethylene glycol (PEG1000 and PEG2000 mixed at 5:1) with a mass ratio of 1:2 and heat to 60-70°C After stirring for 5-15 minutes to form a transparent solution, quickly add triethylenetetramine with a mass ratio of 1:4 to the epoxy resin, stir well and pour it into a polytetrafluoroethylene mold for shaping, and keep the shaping temperature at 70-80°C After 2 hours, a white solid polymer blend is formed. After soaking in pure water for 10-20 hours, the polyethylene glycol phase is completely removed, leaving an epoxy resin with a three-dimensional skeleton structure, and it is naturally dried at room temperature for 1-5 hours. sky;

[0035] Step 2 Three-dimensional ultra-thin structure SiO 2 Preparation: soak the epoxy resin with three-dimensional skeleton structure prepared in step 1 in tetraethyl orthosilicate for 2 to 5 hours, and form SiO after being exposed at 30°C...

Embodiment 2

[0041] Step 1 Preparation of three-dimensional skeleton polymer template: Mix epoxy resin (brand E-44) and polyethylene glycol (PEG1000 and PEG600 at a ratio of 4:1) with a mass ratio of 1:2.5 and heat to 60-70°C After stirring for 5-15 minutes to form a transparent solution, quickly add triethylenetetramine with a mass ratio of 1:4 to the epoxy resin, stir well and pour it into a polytetrafluoroethylene mold for shaping, and keep the shaping temperature at 70-80°C After 2 hours, a white solid polymer blend is formed. After soaking in pure water for 10-20 hours, the polyethylene glycol phase is completely removed, leaving an epoxy resin with a three-dimensional skeleton structure, and it is naturally dried at room temperature for 1-5 hours. sky;

[0042] Step 2 Three-dimensional ultra-thin structure SiO 2 Preparation: soak the epoxy resin with three-dimensional skeleton structure prepared in step 1 in tetraethyl orthosilicate for 2 to 5 hours, and form SiO after being exposed...

Embodiment 3

[0048] Step 1 Preparation of three-dimensional skeleton polymer template: mix epoxy resin (brand E-44) and polyethylene glycol 1000 with a mass ratio of 1:3 and heat to 60-70°C, stir for 5-15 minutes to form a transparent solution Finally, quickly add triethylenetetramine with a mass ratio of 1:4 to the epoxy resin, stir evenly, pour it into a polytetrafluoroethylene mold for shaping, and keep the shaping temperature at 70-80°C for 2 hours to form a white solid For polymer blends, soak in pure water for 10-20 hours and then completely remove the polyethylene glycol phase, leaving an epoxy resin with a three-dimensional skeleton structure, and dry naturally at room temperature for 1-5 days;

[0049] Step 2 Three-dimensional ultra-thin structure SiO 2 Preparation: soak the epoxy resin with three-dimensional skeleton structure prepared in step 1 in tetraethyl orthosilicate for 2 to 5 hours, and form SiO after being exposed at 30°C for 15 hours in an ammonia atmosphere. 2 / epoxy ...

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Abstract

The invention relates to a macroporous structural lithium-sulfur secondary cell. The cell comprises a cathode taking sulfur as a cathode active substance, an anode and an electrolyte, the anode is a lithium sheet, and the cell is characterized in that the cathode is a sulfur / carbon / silicon dioxide composite material which employs a three-dimensional ultrathin structural C / SiO2 composite conductor with large aperture as a matrix, enables sulfur to be attached to the surface of the three-dimensional channel of the matrix in the form of an elementary substance, and employs a layer of a polyester membrane to coat the exterior. The preparation process successively comprises preparing a three-dimensional skeleton structure, preparing a SiO2 macroporous material, preparing a macroporous carbon / silicon dioxide composite conductor, introducing sulfur, and finally covering with a layer of the polyester membrane as an outer protective layer, and using a common technology to assembly the lithium ion battery. The prepared macroporous structural lithium-sulfur secondary cell is different with a conventional lithium ion battery in the structure, does not need an adhesive, the internal resistance is reduced because of the sufficient contact between a conductive material and an electroactive material, the internal structure of the cell is stable, the charge / discharge performances are superior, and the dimension of the cell can be amplified for satisfying large-power need.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to a lithium-sulfur secondary battery, in particular to a lithium-sulfur secondary battery with a macroporous structure and a preparation method thereof. Background technique [0002] Lithium-ion secondary battery is a green energy developed in the 1990s. It is favored because of its excellent performance such as high reversible capacity, high voltage, high cycle performance and high energy density. High energy density has always been the subject of secondary battery research and development. Lithium-sulfur battery is one of the secondary battery systems under development with relatively high energy density. Elemental sulfur or sulfur-containing materials are used as the positive electrode active material, and its theoretical energy density reaches 2600Wh / kg is the representative and direction of secondary batteries with high energy density performance. Lithium-sulfur batteries ha...

Claims

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Application Information

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IPC IPC(8): H01M10/39H01M4/66H01M4/13H01M10/38
CPCH01M4/13H01M4/366H01M4/667H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 张瑞丰陈宗宗江峰梁云霄肖通虎龙能兵
Owner 湖州优研知识产权服务有限公司
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