A carbon-sulfur composite for positive electrode of lithium-sulfur battery and its preparation and application

A lithium-sulfur battery and composite technology, which is applied in the field of nanocomposite materials and its preparation, can solve the problems of low utilization rate of active material sulfur, restrictions on industrialized large-scale production, unsafe and environmentally friendly thiophene, etc., achieve good cycle stability, and benefit Diffusion and transport, the effect of improving electrochemical capacity

Active Publication Date: 2018-10-09
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

[0004] Chinese patent (Application No. 200910111579.8) discloses an ordered mesoporous carbon-sulfur nanocomposite cathode material and its preparation method. Since the prepared mesoporous carbon has a very close double-pore distribution, it is easy to mix ions and electrolytes during sulfur filling. The transmission channel of the active substance is blocked, resulting in a low utilization rate of the active substance sulfur, which limits its development
[0005] Chinese patent (Application No. 201010513866.4) discloses a method for preparing cathode materials for lithium-sulfur batteries by sputtering. However, due to the expensive equipment used, its industrialized mass production is limited.
[0006] Chinese patent (Application No. 200910241977.1) discloses a lithium-sulfur battery cathode material containing a sulfur-containing conductive polymer-sulfur compound. Because the thiophene used in the preparation process is not safe and environmentally friendly, its development is limited.
[0007] Chinese patent (Application No. 201010181391.3) discloses a method for preparing a hollow carbon nanotube filled with sulfur cathode material, but because it needs to be operated under high temperature and high pressure conditions, the process is relatively cumbersome, which also limits its development
[0008] In summary, the existing lithium-sulfur battery cathode materials (composite of sulfur and conductive materials) need to be improved both in terms of product performance and commercial value.

Method used

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  • A carbon-sulfur composite for positive electrode of lithium-sulfur battery and its preparation and application
  • A carbon-sulfur composite for positive electrode of lithium-sulfur battery and its preparation and application
  • A carbon-sulfur composite for positive electrode of lithium-sulfur battery and its preparation and application

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Embodiment 1

[0044] Dissolve non-ionic surfactant P123 in ethanol, stir at 35°C to dissolve completely, and form solution A; wherein the mass ratio of surfactant to ethanol is 1:5, add 0.05M hydrogen to solution A Sodium oxide solution, adjust the pH value to 8, continue to stir for 1h to form solution B; add tetraethyl orthosilicate to solution B, stir for 1h to form solution C; wherein the mass ratio of surfactant to tetraethyl orthosilicate is 1:1; add 10nm 20% silica gel solution and 20% phenolic resin solution to solution C, continue stirring for 3 hours to form solution D; wherein the mass ratio of P123 to silica gel solution is 1:1, silica gel and phenolic resin The mass ratio is 1:1; the solution D is aged at 90°C for 12h to obtain powder E; the powder E is kept at 400°C for 2h and 800°C for 2h under nitrogen gas protection to obtain powder F; the obtained powder Soak and wash with 5% hydrofluoric acid solution for 12 hours, and dry at 80°C to obtain the carbon material with gradie...

Embodiment 2

[0050] Dissolve non-ionic surfactant F127 in ethanol, stir at 40°C to dissolve completely, and form solution A; wherein the mass ratio of surfactant to ethanol is 1:5, add 1M hydroxide to solution A Sodium solution, adjust the pH value to 9, continue to stir for 1h to form solution B; add tetraethyl orthosilicate to solution B, stir for 1h to form solution C; wherein the mass ratio of surfactant to tetraethyl orthosilicate is 1 : 2; Add 20nm 40% silica gel solution and 20% phenolic resin solution in solution C, continue to stir for 3h, form solution D; Wherein the mass ratio of F127 and silica gel solution is 1:1, the ratio of silica gel and phenolic resin The mass ratio is 2:1; the solution D is aged at 100°C for 24 hours to obtain powder E; the powder E is kept at a constant temperature of 350°C for 3 hours and 900°C for 3 hours under nitrogen gas protection to obtain powder F; the obtained powder is used Soak and wash in 10% hydrofluoric acid solution for 24 hours, and dry ...

Embodiment 3

[0060] Dissolve non-ionic surfactant P123 in isopropanol, stir at 50°C to dissolve completely, and form solution A; wherein the mass ratio of surfactant to ethanol is 1:6, add 1M Potassium hydroxide solution, adjust the pH value to 11, continue to stir for 3 hours to form solution B; add methyl orthosilicate to solution B, stir for 3 hours to form solution C; wherein the mass ratio of surfactant to ethyl orthosilicate 1:3; add 30nm 40% silica gel solution and 40% phenolic resin solution to solution C, and continue to stir for 6 hours to form solution D; wherein the mass ratio of P123 to silica gel solution is 1:3, silica gel and phenolic resin The mass ratio of the solution D is 4:1; the solution D is aged at 150°C for 72h to obtain the powder E; the powder E is kept at a constant temperature of 350°C for 5h and 1000°C for 5h under the protection of nitrogen gas to obtain the powder F; the obtained powder Soak and wash in 1M sodium hydroxide solution at 80°C for 12 hours, and ...

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Abstract

The invention relates to a carbon-sulfur composite for positive electrodes of lithium-sulfur batteries and its preparation and application. The composite includes carbon materials and elemental sulfur, wherein the carbon materials have a gradient ordered tertiary pore structure, and the pore diameter of the tertiary channels is The distribution range is that micropores less than 2nm are used as primary pores, small mesopores around 3-10nm are used as secondary pores, and large mesopores of 10-30nm are used as tertiary pores. The secondary pores are located on the pore wall of the tertiary pores. The primary pores are located on the pore wall of the secondary pores; the elemental sulfur is filled in the pores of the carbon material, and the elemental sulfur accounts for 10-80wt% of the total amount of the compound. The carbon-sulfur composite is used in lithium-sulfur secondary batteries, exhibits high sulfur utilization rate and good cycle stability, and has the advantages of simple preparation process, good repeatability, low cost and microscopic controllability.

Description

technical field [0001] The invention relates to a nanocomposite material and a preparation method thereof, in particular to a carbon-sulfur compound suitable for the positive electrode of 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, which is much larger than any commercial secondary battery currently used. In addition to high energy density, lithium-sulfur batteries also have the advantages of less environmental pollution, good safety performance, and the positive electrode material elemental sulfur has abundant sources and low price. Therefore, lithium-sulfur batteries will have broad application prospects in the field of new energy. As a power battery, it can be widely used in plug-in hybrid vehicles, electric vehicles, space vehicles, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/04H01M4/13H01M4/139H01M10/052
CPCY02E60/10
Inventor 王美日张华民张洪章曲超吴宝山
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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