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Lithium-sulfur cell anode composite material and its preparation method and use

A technology for composite materials and lithium-sulfur batteries, applied in battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems that materials containing silicon-oxygen groups cannot uniformly disperse carbon-sulfur compounds and limit development, etc. Achieve the effect of suppressing the shuttle effect, low product cost, and low raw material price

Active Publication Date: 2014-02-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its post-addition method, the substances containing siloxane groups cannot be uniformly dispersed around the carbon-sulfur complex, which limits its development.
[0007] In summary, improving the structure of carbon materials to form new carbon-sulfur complexes with sulfur or adding adsorbents on the basis of existing carbon-sulfur complexes can effectively inhibit the shuttle of polysulfides and improve the cycle stability of lithium-sulfur batteries. However, the existing cathode materials for lithium-sulfur batteries have room for improvement both in terms of product preparation methods and commercial value.

Method used

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  • Lithium-sulfur cell anode composite material and its preparation method and use
  • Lithium-sulfur cell anode composite material and its preparation method and use

Examples

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Embodiment 1

[0035] Mix thiophenemethanol and tetraethyl orthosilicate at a molar ratio of 10:1, stir at room temperature to fully dissolve to form a transparent solution A; add 2M sodium hydroxide solution to solution A, continue stirring, and adjust the pH The value is 7, so that it generates a yellow-orange liquid-solid product B; the product B is distilled under reduced pressure at -0.1MPa for 5h at 100°C to obtain the product C; the product C is added to the mixed solution of toluene and n-hexane (V: V =10:1), recrystallized at -10°C to obtain product D; washed product D with n-hexane for 3 times, and vacuum dried to obtain product E; dissolved solid powder E in ethanol (solution concentration: 1%) , mixed uniformly at 0°C to form solution F; take elemental sulfur, cetyl ammonium bromide (CTAB), and ferric chloride and dissolve them in ethanol (solution F) at a mass ratio of 1:1:0.1:1 concentration is 0.1%), and stirred for 10 minutes to form solution G; slowly added solution F to sol...

Embodiment 2

[0037] Mix aniline alcohol and methyl orthosilicate in a molar ratio of 1:1, stir at room temperature to fully dissolve to form a transparent solution A; add 0.2M sodium hydroxide solution to solution A, continue stirring, and adjust the pH The value is 7, so that it generates a yellow-orange liquid-solid product B; the product B is distilled under reduced pressure at -0.1MPa for 5h at 150°C to obtain the product C; the product C is added to the mixed solution of toluene and n-hexane (V: V =1:1), recrystallized at -10°C to obtain product D; washed product D with n-hexane for 5 times, and vacuum dried to obtain product E; dissolved solid powder E in water and mixed evenly at 0°C to form solution F (solution concentration is 80%); take elemental sulfur, polyethylene oxide-polypropylene oxide-polyethylene oxide, and ammonium persulfate in a mass ratio of 1:5:1:5. In the solvent in step (6), stir for 10 minutes to form solution G; slowly add solution F to solution G (solution concen...

Embodiment 3

[0039] Mix aniline alcohol and tetraethyl orthosilicate at a molar ratio of 10:1, stir at room temperature to fully dissolve to form a transparent solution A; add 0.1M sodium bicarbonate solution to solution A, continue stirring, and adjust the pH The value is 9, so that it generates a yellow-orange liquid-solid product B; the product B is distilled under reduced pressure at -0.1MPa for 5h at 150°C to obtain the product C; the product C is added to the mixed solution of toluene and n-hexane (V: V =1:1), recrystallized at -10°C to obtain product D; washed product D with n-hexane for 5 times, and vacuum dried to obtain product E; dissolved solid powder E in water and mixed evenly at 0°C , forming solution F (solution concentration is 10%); take elemental sulfur, polyethylene oxide-polypropylene oxide-polyethylene oxide, and hydrogen peroxide in a ratio of 1:5:1:8 by mass and dissolve in the step In the solvent in (6), stir for 30 minutes to form solution G; slowly add solution F...

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Abstract

The invention relates to a lithium-sulfur cell anode composite material and a preparation method thereof. The lithium-sulfur cell anode composite material is a shell-core structure comprising a Si-O bond-containing conducting polymer as a shell and sulfur in the shell, and the sulfur content is in a range of 10-90wt%. Through the Si-O bond having reception bag functions, the lithium-sulfur cell anode composite material has a strong capability of adsorption and release of lithium polysulfide produced by in cell charging and discharging, can effectively inhibit tunneling effects of lithium polysulfide and can improve cell cycling stability and coulombic efficiency.

Description

technical field [0001] The invention relates to an electrode material and a preparation method thereof, in particular to a positive electrode material for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Lithium-sulfur battery is a secondary battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode. Its specific energy can theoretically reach 2600Wh / kg, and the actual energy density can reach 300Wh / kg at present, and it is very likely to increase to 300Wh / kg in the next few years. At the same time, the elemental sulfur cathode material has the advantages of abundant sources, low price, and environmental friendliness, and is considered to be one of the most attractive secondary battery systems at present. [0003] However, there are still many problems in the development of lithium-sulfur batteries. The utilization rate of sulfur as the positive active material is not high, and the cycle capaci...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/13
CPCY02E60/122H01M4/366H01M4/624H01M10/052Y02E60/10
Inventor 张华民王美日曲超张益宁王倩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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