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Lithium-sulfur battery composite cathode material, preparation method thereof and application of lithium-sulfur battery

A composite positive electrode material and lithium-sulfur battery technology, which is applied in the field of electrochemical energy, can solve the problems of poor cycle performance, low capacity, and high production cost, and achieve high rate performance, high lithium ion conductivity, and stable product quality.

Active Publication Date: 2018-10-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of low capacity performance, poor cycle performance and high production cost of lithium-sulfur batteries in the prior art, the first purpose of the present invention is to provide a lithium-sulfur battery with good electronic conductivity, good lithium ion conductivity, and high sulfur loading capacity. It is a lithium-sulfur battery composite cathode material that can stably bind polysulfides in the cathode region and have a high utilization rate of active material sulfur

Method used

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  • Lithium-sulfur battery composite cathode material, preparation method thereof and application of lithium-sulfur battery
  • Lithium-sulfur battery composite cathode material, preparation method thereof and application of lithium-sulfur battery
  • Lithium-sulfur battery composite cathode material, preparation method thereof and application of lithium-sulfur battery

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Embodiment 1

[0050] Put 1.2g of washed lotus leaf stalks, 1.2g of nickel acetate, and 5g of potassium hydroxide into a mixed solution of 100mL of deionized water and 10mL of alcohol and stir evenly at a speed of 500r / min. Then put it in a vacuum drying oven to dry at 60°C for 5h, and finally put it in a tube furnace, raise the temperature to 850°C at a rate of 5°C / min in an argon atmosphere and keep it for 4h. After the reaction is completed, cool down to room temperature. The solution and deionized water were repeatedly washed to neutrality, and a nickel-doped conductive graphitized carbon material was obtained after freeze-drying at -120°C for 24 hours.

[0051] 0.2g nickel-doped conductive graphitized carbon material was put into CS dissolved with 0.8g elemental sulfur 2 After the organic solution is stirred and mixed, use a syringe to drop the mixed solution on the 2025 battery case or put it into a porcelain boat, heat at 50°C to evaporate all the solvent, and finally place it at a te...

Embodiment 2

[0055] Put 1.2g of washed lotus leaf stalks, 1.74g of nickel nitrate, 0.06g of urea, and 3.58g of potassium hydroxide into a mixed solution of 100mL of deionized water and 10mL of alcohol and stir evenly at a speed of 500r / min. Then put it in a vacuum drying oven for 5 hours at 60°C, and finally put it in a tube furnace, raise the temperature to 500°C at a rate of 1°C / min in an argon atmosphere and keep it for 1 hour. The solution and deionized water were repeatedly washed until neutral, and then freeze-dried at -120°C for 24 hours to obtain a nickel-nitrogen co-doped conductive graphitized carbon material.

[0056] 0.18g nickel-nitrogen co-doped conductive graphitized carbon material and 0.02g PEO (molecular weight 4,000,000) were put into CS dissolved with 0.8g elemental sulfur 2 After the organic solution is stirred and mixed, use a syringe to drop the mixed solution on the 2025 battery case or put it into a porcelain boat, heat at 50°C to evaporate all the solvent, and fin...

Embodiment 3

[0060] Put 1.2g of washed cotton stalks, 18.3g of cobalt acetate, 4.2g of sodium fluoride, and 16.8g of sodium hydroxide into a mixed solution of 200mL of deionized water and 50mL of alcohol and stir evenly at a speed of 1000r / min. Then put it in a vacuum drying oven to dry at 60°C for 5h, and finally place it in a tube furnace, raise the temperature to 1000°C at a rate of 10°C / min under an argon atmosphere and keep it for 12h. The solution and deionized water were repeatedly washed to neutrality, and a cobalt-fluorine co-doped conductive graphitized carbon material was obtained after freeze-drying at -120°C for 36 hours. figure 1 As shown in the XRD pattern, the carbon material without metal precursor is amorphous carbon.

[0061] 0.4g cobalt-fluorine co-doped conductive graphitized carbon material and 0.2g PEO (molecular weight of 2000) were put into CS dissolved with 0.4g elemental sulfur 2 After the organic solution is stirred and mixed, use a syringe to drop the mixed so...

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Abstract

The invention discloses a lithium-sulfur battery composite cathode material, a preparation method thereof and a lithium-sulfur battery. The composite cathode material is formed by compositing raw materials comprising an elemental sulfur, metal-nonmetal element co-doped conductive graphitized carbon material and a lithium-conducting polymer; during the preparation process, the metal-nonmetal co-doped conductive graphitized carbon material, the lithium-conducting polymer and the solution with the elemental sulfur are stirred and mixed, then the solvent is volatilized, and heat-treated, thereby obtaining the composite cathode material having high conductivity and capable of improving the utilization rate of an active substance sulfur. The preparation method is simple, the process conditions are mild, the production cost of the lithium-sulfur battery cathode material is greatly reduced, and industrial production requirements are met; the lithium-sulfur battery made of the composite cathodematerial has a high discharge specific capacity, a stable cycle performance and a high safety performance, without the need for a current collector, and without need to add a conductive agent and a binder.

Description

technical field [0001] The invention relates to a lithium-sulfur battery composite cathode material and the application of an all-solid-state lithium-sulfur battery, in particular to a low-cost, high-sulfur lithium-sulfur battery composite cathode material and a preparation method thereof, and also relates to a high-energy density, A lithium-sulfur battery with high power density and fast charging and discharging belongs to the technical field of electrochemical energy. Background technique [0002] With the development of science and technology, environmental and resource issues have become increasingly prominent, and the development of green, efficient and renewable new energy storage devices has become an important strategy and research focus for the development of various countries. The lithium-sulfur battery composed of elemental sulfur as the positive electrode and metal lithium as the negative electrode has a high theoretical specific capacity (1675mAh g -1 ) and mas...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 刘晋李劼张智林月
Owner CENT SOUTH UNIV
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