Lithium-sulfur battery positive electrode structure and preparation method thereof

A lithium-sulfur battery and positive electrode technology, applied in the field of positive electrode structure and preparation, to achieve the effects of reducing mass transfer polarization, increasing discharge voltage platform, and increasing energy density

Active Publication Date: 2014-06-04
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

Therefore, improving the structure of the electrode is effective in increasing the energy density of the battery, but the existing lithium-sulfur battery positive electrode needs to be improved both in terms of product preparation methods and commercial value.

Method used

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  • Lithium-sulfur battery positive electrode structure and preparation method thereof
  • Lithium-sulfur battery positive electrode structure and preparation method thereof
  • Lithium-sulfur battery positive electrode structure and preparation method thereof

Examples

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Embodiment 1

[0034]Elemental sulfur and ordered mesoporous carbon (pore diameter 50nm, specific surface 60) are compounded by hot-melt method to prepare carbon-sulfur composite A, and the sulfur filling amount is 70%. Take A, conductive graphite, carboxymethyl cellulose The sodium is mixed evenly by ball milling at a mass ratio of 8:1:1, dispersed in the aqueous solution, and stirred to obtain the positive electrode active layer slurry B, wherein the solid content of the slurry is 15%, and the slurry is evenly scraped on the aluminum foil current collector , after vacuum drying at 80°C, press to obtain a large-diameter carbon-sulfur composite layer with a thickness of 50 μm.

[0035] Elemental sulfur and activated carbon (pore diameter 0.5nm, specific surface 300) are compounded by hot-melt method to prepare carbon-sulfur composite C, and the sulfur filling amount is 50%. 9:0:1 ball milling to mix evenly, disperse in N-methylpyrrolidone, stir to obtain positive electrode active layer slurr...

Embodiment 2

[0040] Composite elemental sulfur and graphene by hot-melt method to prepare carbon-sulfur composite A, the amount of sulfur filling is 95%, take A, conductive graphite, sodium carboxymethyl cellulose according to the mass ratio of 8:1:1 ball mill and mix evenly Afterwards, it was dispersed in an aqueous solution, and stirred to obtain positive electrode active layer slurry B, wherein the solid content in the slurry was 10%, and the slurry was uniformly scraped and coated on the aluminum foil current collector, and after vacuum drying at 50°C, it was pressed to obtain a large-pore size slurry B. The carbon-sulfur composite layer has a thickness of 500 μm.

[0041] Composite elemental sulfur and carbon nanotubes by hot-melt method to prepare carbon-sulfur composite C, the amount of sulfur filling is 10%, take C, acetylene black, and polyvinylidene fluoride in a mass ratio of 9:0:1 and mix them evenly by ball milling Disperse in N-methylpyrrolidone and stir to obtain positive el...

Embodiment 3

[0044] Prepare carbon-sulfur composite A by mechanically mixing elemental sulfur and conductive carbon black, the sulfur filling amount is 10%, take A, conductive graphite, and sodium carboxymethyl cellulose in a mass ratio of 1:1:0.5 and ball mill and mix them evenly Then disperse in the aqueous solution and stir to obtain positive electrode active layer slurry B, wherein the solid content in the slurry is 5%, and the slurry is uniformly scraped and coated on the aluminum foil current collector, and after vacuum drying at 50°C, it is pressed to obtain a carbon with a large pore size. The sulfur composite layer has a thickness of 100 μm.

[0045] The elemental sulfur and carbon nanofibers were prepared into a carbon-sulfur composite C by in-situ reaction composite method, and the sulfur filling amount was 95%, and C, acetylene black, and polyvinylidene fluoride were ball-milled and mixed uniformly at a mass ratio of 1:1:0.05 Then disperse in N-methylpyrrolidone, and stir to ob...

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Abstract

The present invention relates to a lithium-sulfur battery positive electrode structure and a preparation method thereof. According to the lithium-sulfur battery positive electrode structure, a current collector is adopted as a substrate, two carbon-sulfur complex layers with different pore sizes are attached onto the substrate, the structure sequentially comprises the current collector, the large pore size carbon-sulfur complex layer and the small pore size carbon-sulfur complex layer, the thickness of the large pore size carbon-sulfur complex layer is 50-500 mum, the thickness of the small pore size carbon-sulfur complex layer is 10-200 mum, the large pore size carbon material is a carbon material with a pore size of greater than 100 nm and less than 1 mum and a pore volume accounting for 50-90% of the total pore volume, and the small pore size carbon material is a carbon material with a pore size of 0.5-100 nm and a pore volume accounting for more than 50-90% of the total pore volume. With the lithium-sulfur battery positive electrode structure, the mass transfer curvature of the lithium ions in the electrode is effectively increased, the lithium ion transmission path is prolonged, provision of the capacity of the high supporting capacity active substance is easily achieved, and the energy density of the battery is increased.

Description

technical field [0001] The invention relates to a lithium-sulfur battery positive electrode and a preparation method thereof, in particular to a positive electrode structure and a preparation method thereof. Background technique [0002] In recent years, with the continuous advancement of science and technology and the rapid development of various electronic products, the chemical power sources used are required to have the characteristics of light weight, small size, and large capacity. In order to meet the needs of society and greatly increase the energy density of batteries, the development of new materials and new systems is necessary. [0003] 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/122H01M4/0404H01M4/13H01M4/139H01M4/366H01M10/052H01M2004/028Y02E60/10
Inventor 张华民王美日张益宁曲超王倩李婧聂红娇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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