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Lithium-sulfur battery cathode material, preparation method thereof, electrode sheet, and lithium-sulfur battery

A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve the problems of reducing the utilization rate of active material sulfur, low energy density of batteries, and increasing production costs, so as to improve cycle life. Stability, facilitate wetting, and improve utilization

Active Publication Date: 2020-11-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Since the traditional physical confinement method cannot change the situation that the capacity is still significantly reduced during the cycle, in addition, the introduction of complex synthesis methods and other substances will inevitably increase the production cost in practical applications and reduce the utilization rate of active material sulfur
These factors limit the sulfur content in sulfur composite cathode materials, resulting in lower battery energy density of composite materials

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  • Lithium-sulfur battery cathode material, preparation method thereof, electrode sheet, and lithium-sulfur battery
  • Lithium-sulfur battery cathode material, preparation method thereof, electrode sheet, and lithium-sulfur battery
  • Lithium-sulfur battery cathode material, preparation method thereof, electrode sheet, and lithium-sulfur battery

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preparation example Construction

[0028] The present invention also provides a preparation method of the cathode material of lithium-sulfur battery, the preparation method mainly includes the following steps:

[0029] Step 1: heat-treat sulfur powder to obtain liquid sulfur, and then add organic matter into the liquid sulfur for high-temperature solidification. Specifically, the heat treatment is carried out in the air, accompanied by a stirring process, and the specific heat treatment method is to heat up to 175° C. to 185° C. and then keep the temperature at this temperature for 3 hours to 6 hours.

[0030] Step 2: After grinding the mixture obtained in Step 1, heat treatment is carried out under the condition of flowing inert gas, so as to make further copolymerization reaction of sulfur and organic matter, thereby obtaining the positive electrode material of the lithium-sulfur battery. Specifically, the inert gas is nitrogen or argon, the heat treatment temperature is 250°C-350°C, the heating rate is 2-5°C...

Embodiment 1

[0041] A positive electrode material for a lithium-sulfur battery is an organic sulfur polymer material with a relatively high sulfur content, and the organic sulfur polymer material is formed through a copolymerization reaction of liquid sulfur formed after melting organic matter and sulfur powder.

[0042]The preparation method of the above-mentioned lithium-sulfur battery cathode material is:

[0043] a) Heating 0.3g of sulfur powder to 175°C to 185°C to obtain liquid sulfur, adding 2.7g of organic matter to the liquid sulfur and keeping it at this temperature for 3h to 6h for high temperature curing; b) Grinding the material obtained in step a) Afterwards, pass in an inert gas and conduct heat treatment at 250°C. The heating rate during heat treatment is 2-5°C / min, and then keep it at 250°C for 4 hours to further copolymerize sulfur and organic matter to obtain the lithium-sulfur battery cathode material.

[0044] see figure 1 and figure 2 , it can be seen that the sur...

Embodiment 2

[0048] A positive electrode material for a lithium-sulfur battery is an organic sulfur polymer material with a relatively high sulfur content, and the organic sulfur polymer material is formed through a copolymerization reaction of liquid sulfur formed after melting organic matter and sulfur powder.

[0049] The preparation method of the above-mentioned organosulfur polymer material comprises the following steps:

[0050] a) heating 1g of sulfur powder to 175°C to 185°C to obtain liquid sulfur, then adding 3g of organic matter into the liquid sulfur and then keeping it at this temperature for 3 to 6 hours to perform high temperature curing; b) making the material obtained in step a) After grinding, pass in an inert gas and conduct heat treatment at 250°C with a heating rate of 2-5°C / min, and then keep it at 250°C for 4 hours to further copolymerize sulfur and organic matter to obtain the organic sulfur polymerization anode material. The cathode material of the lithium-sulfur ...

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Abstract

The invention discloses a lithium-sulfur battery cathode material, a preparation method thereof, an electrode slice and a lithium-sulfur battery, and belongs to the technical field related to chemicalpower supplies. The lithium-sulfur battery cathode material formed by copolymerization reaction between an organic matter and liquid sulfur formed by fusion of sulfur powder, and the sulfur is fixedin a chemical bonding manner; and the content of sulfur in the lithium-sulfur battery cathode material is 50-90%. The preparation method comprises the following steps that (1) heat treatment is carried out on the sulfur powder to obtain the liquid sulfur, the organic matter is added to the liquid sulfur, and high-temperature fixation is carried out to obtain a mixture; and (2) the mixture undergoes grinding and heat treatment successively so that the sulfur powder further makes copolymerization reaction with the organic matter, and the lithium-sulfur battery cathode material is obtained. The sulfur is fixed via the chemical bonding method, stable circulation of the battery is realized, the sulfur content is high, the battery energy density and the sulfur utilization rate are improved, andthe production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field related to chemical power sources, and more specifically relates to a lithium-sulfur battery cathode material, a preparation method thereof, an electrode sheet and a lithium-sulfur battery. Background technique [0002] With the wide application of electronic devices in our daily life, the current rechargeable batteries will soon be unable to meet the growing demand. Due to the high theoretical specific capacity of both the sulfur cathode and the lithium anode, research on lithium-sulfur batteries is gradually heating up. In addition, the sulfur-rich mineral production and environmental friendliness will be beneficial to the actual promotion of the market. With continuous research in the past decade, lithium-sulfur batteries are in the ascendant as a next-generation energy storage system. [0003] However, there are several important issues hindering the application of lithium-sulfur batteries, the main di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/38H01M4/60H01M10/052
CPCY02E60/10
Inventor 李真李想袁利霞黄云辉刘德重袁开向经纬陈杰
Owner HUAZHONG UNIV OF SCI & TECH
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