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A kind of preparation method of cathode material of lithium-sulfur battery

A lithium-sulfur battery and cathode material technology, applied in the energy field, can solve the problems of limiting the large-scale application of doped carbon materials, the complexity of the preparation process, the volume change of the sulfur cathode, etc., so as to achieve high value-added utilization and improve cycle stability. and discharge specific capacity, the effect of high cost

Active Publication Date: 2022-04-15
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The third problem is the volume change of the sulfur cathode during cycling
However, expensive precursors, low yields of carbon materials, and the complexity of the preparation process greatly limit the large-scale application of these doped carbon materials.

Method used

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  • A kind of preparation method of cathode material of lithium-sulfur battery
  • A kind of preparation method of cathode material of lithium-sulfur battery
  • A kind of preparation method of cathode material of lithium-sulfur battery

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Effect test

Embodiment 1

[0040] 1. Preparation of high-sulfur coal-based honeycomb porous carbon material: (1) Weigh 10.16g of magnesium chloride hexahydrate (MgCl 2 6H 2 O) and 12.85g of ammonium bicarbonate (NH 4 HCO 3 ) was dissolved in 500 ml of water to form a white emulsion under magnetic stirring. And heated to 50° C. in a water bath and stirred for 10 hours. The obtained white emulsion was suction-filtered, washed repeatedly with deionized water for more than 3 times, and dried at 60°C. The obtained white powder was pyrolyzed in a tube furnace at 500 °C, the atmosphere was air, and the heating rate was 5 °C min -1 , kept at 500°C for 3 hours, and naturally cooled to room temperature to obtain white magnesium oxide (MgO) powder. (2) Weigh 10 grams of dry high-sulfur coal into a flask, add 150 milliliters of concentrated nitric acid, heat in a water bath to 80 degrees Celsius, and stir magnetically at a constant temperature for 16 hours. After taking it out, wash it repeatedly with distill...

Embodiment 2

[0044] 1. Preparation of multi-layer honeycomb porous carbon material: (1) take 10.16g of magnesium chloride hexahydrate (MgCl 2 6H 2 O) and 12.85g of ammonium bicarbonate (NH 4 HCO 3 ) was dissolved in 500 ml of water to form a white emulsion under magnetic stirring. And heated to 50° C. in a water bath and stirred for 10 hours. The obtained white emulsion was suction-filtered, washed repeatedly with deionized water for more than 3 times, and dried at 60°C. The obtained white powder is pyrolyzed in a tube furnace, and the heating program is started to 500°C, the atmosphere is air, and the heating rate is 5°C min -1 , kept at 500°C for 3 hours, and naturally cooled to room temperature to obtain white magnesium oxide (MgO) powder. (2) Coal (unoxidized) sample 2g, magnesia template 6g and activator KOH 4g (ratio 1:3:2), ground and mixed thoroughly and placed in a corundum boat. Flow meter flow is set to 30 ~ 60ml min -1 (N 2 atmosphere), set at 5°C min -1 The heating pr...

Embodiment 3

[0048] 1. Preparation of high-sulfur coal-based honeycomb porous carbon material: (1) weigh 10.16g of magnesium chloride hexahydrate (MgCl 2 6H 2 O) and 12.85g of ammonium bicarbonate (NH 4 HCO 3 ) was dissolved in 500 ml of water to form a white emulsion under magnetic stirring. And heated to 50° C. in a water bath and stirred for 10 hours. The obtained white emulsion was suction-filtered, washed repeatedly with deionized water for more than 3 times, and dried at 60°C. The obtained white powder is pyrolyzed in a tube furnace, and the heating program is started to 500°C, the atmosphere is air, and the heating rate is 5°C min -1 , kept at 500°C for 3 hours, and naturally cooled to room temperature to obtain white magnesium oxide (MgO) powder. (2) Weigh 10 grams of dry high-sulfur coal into a flask, add 150 milliliters of concentrated nitric acid, heat to 80 degrees Celsius in a water bath in a fume hood, and stir magnetically at a constant temperature for 16 hours. After ...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery cathode material, which belongs to the field of energy. In the present invention, high-sulfur coal is selected as a precursor, magnesium oxide nanospheres are used as a template agent, and potassium hydroxide is used as a pore-enlarging agent. The high-sulfur coal is rich in reserves, cheap and easy to obtain. It contains S, N and O heteroatoms, and the high-sulfur coal is controlled by oxidation The structure of sulfur coal, adjusting the carbonization temperature and the ratio of high-sulfur coal to magnesium oxide nanospheres and potassium hydroxide can control the morphology and structure of honeycomb porous carbon materials, and realize the use of porous physical confinement and S, N and O heteroatoms Chemisorption of lithium polysulfides to improve cycle stability and specific discharge capacity of lithium-sulfur batteries. The preparation method of the invention is simple, and the honeycomb porous carbon material doped with S, N and O can be mass-produced, and the prepared porous carbon material has excellent performance as a host material of a lithium-sulfur battery. The invention can not only realize high value-added utilization of high-sulfur coal, but also solve the difficult problem in coal chemical industry of efficient utilization of high-sulfur coal.

Description

technical field [0001] The invention belongs to the field of energy, and specifically relates to a preparation method of a high-sulfur coal-based lithium-sulfur battery positive electrode material and its application in lithium-sulfur batteries, including the preparation of nitrogen, oxygen and sulfur co-doped honeycomb porous carbon. Background technique [0002] Lithium-sulfur battery is a new type of secondary battery with a theoretical specific energy of 2600Whkg -1 And the theoretical discharge specific capacity is 1675mAhg -1 , making lithium-sulfur batteries have broad development and application prospects. Despite these outstanding advantages in terms of energy density and cost, several issues limit the commercialization of Li-S batteries. The first question is the ultimate discharge species of elemental sulfur Li 2 S n (1≤n≤2) are poor conductors, leading to larger electrochemical polarization and cell impedance. Another obstacle is the diffusion and migration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/052
CPCH01M4/362H01M4/38H01M4/583H01M10/052H01M2004/028Y02E60/10
Inventor 雷智平杜志明任世彪王知彩水恒福康士刚
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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