Metal-doped carbon/sulfur compound, and preparation and application thereof

A technology of metal doping and composites, applied in electrical components, battery electrodes, circuits, etc., can solve problems affecting the discharge performance of lithium-sulfur batteries, unfavorable active material sulfur nanometerization, and restricting development, so as to improve cycle stability, The effect of low price and low product cost

Active Publication Date: 2013-04-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent 200910241977.1 provides a lithium-sulfur battery cathode composite material and its preparation method, but because the preparation process needs to be carried out in a sealed and vacuumable ball mill tank, the process is relatively cumbersome, which limits its development
Because the carbon material used is a macroporous carbon material, it is not conducive to the nanonization of the active material sulfur, which affects the discharge performance of the lithium-sulfur battery
[0008] Chinese patent 201010513866.4 discloses a method for preparing the positive electrode of a lithium-sulfur battery. Because a sputtering device is used, the process is relatively cumbersome, which limits its development.

Method used

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  • Metal-doped carbon/sulfur compound, and preparation and application thereof
  • Metal-doped carbon/sulfur compound, and preparation and application thereof
  • Metal-doped carbon/sulfur compound, and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Mix 1.0g of triblock copolymer (F127) and 5.0g of ethanol uniformly, add 1.0g of 0.2M dilute hydrochloric acid solution, stir at room temperature for 0.5h to fully dissolve and form transparent solution A; add 0.5g of Phenolic resin and 0.05g cobalt nitrate, continue to stir for 0.5h to form a uniform solution B; add 2g of magnesium oxide to solution B, continue to stir at room temperature for 3h to form solution C; spread solution C evenly on a glass plate , after volatilizing at room temperature for 3 hours, treat at 80°C for 12h to form a soft film D; heat treat film D at 300°C for 2 hours under inert gas protection conditions, and heat treat at 800°C for 1 hour under inert gas protection conditions to obtain solid powder E, wherein The heating rate is 1°C / min, soak solid powder E in 0.5M dilute acid solution for 24 hours, wash and dry to obtain black powder F; after mixing black powder F and elemental sulfur at a mass ratio of 1:1 , placed in a tube furnace, kept at...

Embodiment 2

[0038]After uniformly mixing 1.0g F127 and 20.0g ethanol, add 1.0g dilute hydrochloric acid solution, stir at room temperature for 3 hours to fully dissolve and form a transparent solution A; add 0.5g phenolic resin and 0.05g nickel nitrate solution to solution A, continue Stir for 0.5h to form a uniform solution B; add 2g of alumina to solution B, reflux and stir at 90°C for 8h to form solution C; apply solution C evenly on a glass plate, evaporate at room temperature for 12h, ℃ treatment for 48 hours to form a soft film D; the film D was heat-treated at 400 ℃ for 6 hours under inert gas protection conditions, and 1200 ℃ for 5 hours under inert gas protection conditions to obtain solid powder E, wherein the heating rate was 10 ℃ / min, Soak solid powder E in 5M dilute acid solution for 50 hours, wash and dry to obtain black powder F; mix black powder F and elemental sulfur uniformly at a mass ratio of 1:5, place in a tube furnace, vacuum The temperature is -0.03MPa, 160°C for 1...

Embodiment 3

[0040] After uniformly mixing 1.0g F127 and 10.0g ethanol, add 1.0g dilute hydrochloric acid solution, stir at room temperature for 1 hour to fully dissolve and form a transparent solution A; add 1.0g phenolic resin and 0.1g copper acetate to solution A, and continue stirring 0.5h to form a uniform solution B; add 2g calcium carbonate to solution B, stir at 40°C for 4.5h to form solution C; apply solution C evenly on a glass plate, evaporate at room temperature for 12h, Treat for 24 hours to form a soft film D; heat treat the film D at 350°C for 3 hours under inert gas protection conditions, and heat treat at 900°C for 2 hours under inert gas protection conditions to obtain solid powder E, wherein the heating rate is 5°C / min. Soak solid powder E in 2M dilute hydrochloric acid solution for 50 hours, wash and dry to obtain black powder F; mix black powder F and elemental sulfur evenly in a mass ratio of 1:4, place in a tube furnace, vacuum It was kept at -0.1MPa and 150°C for 5h...

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Abstract

The invention relates to a metal-doped carbon/sulfur compound, and preparation and application thereof. The metal-doped carbon/sulfur compound is prepared through the following steps: blending a carbon-containing organic substance and a metal salt solution, then adding a template agent, roasting at high temperature, and performing hot melt sulfur filling. In the preparation process, the metal element is simultaneously doped in the carbonization process, so that more abundant pore structures are formed in the carbon material, the pore volume and specific area of the carbon material are improved in the carbonization process, the reaction zone of the active substance sulfur is increased, the graphitization temperature of the carbon material is lowered, and the own stability of the carbon material is enhanced while the loading capacity of the active substance sulfur is improved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to anode materials for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] The lithium-sulfur secondary lithium battery is one of the battery systems with a relatively high theoretical discharge capacity among known lithium-ion batteries. In the positive electrode of the battery, elemental sulfur is abundant in natural resources, cheap and environmentally friendly. The density of elemental sulfur is 1.96g / cm 3 , with a theoretical specific capacity of 1675mAh / g, which is one of the positive electrode active materials with the highest specific capacity among the positive electrode materials known to people. The Li-S battery (Lithium Sulfur Cell) based on metal lithium as the negative electrode and elemental sulfur as the positive electrode has the characteristics of high specific energy (theoretical value is 2 600Wh / kg), low cost, and env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/136
CPCY02E60/10
Inventor 张华民王美日张益宁钟和香王倩李婧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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