Porous carbon nanobelt lithium-sulfur battery positive electrode material and its preparation method and application

A technology for lithium-sulfur batteries and positive electrode materials, applied in the field of porous carbon nanobelt lithium-sulfur battery positive electrode materials and its preparation, can solve the problem of unsatisfactory rate performance and cycle performance of carbon-containing lithium-sulfur battery positive electrode materials, lithium-sulfur battery rate performance and Poor cycle performance and other problems, to achieve good wettability and high elemental sulfur content, improve sulfur fixation performance, and improve the effect of utilization

Active Publication Date: 2020-09-04
SHENZHEN UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a porous carbon nanobelt lithium-sulfur battery positive electrode material and its preparation method, to solve the unsatisfactory rate performance and cycle performance of the existing carbon-containing lithium-sulfur battery positive electrode materials technical problem
[0008] Another object of the present invention is to provide a lithium-sulfur battery positive electrode and a lithium-sulfur battery to solve the existing lithium-sulfur battery positive electrode and lithium-sulfur battery due to the lithium-sulfur positive electrode material, resulting in poor rate performance and cycle performance of lithium-sulfur battery technology question

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  • Porous carbon nanobelt lithium-sulfur battery positive electrode material and its preparation method and application
  • Porous carbon nanobelt lithium-sulfur battery positive electrode material and its preparation method and application
  • Porous carbon nanobelt lithium-sulfur battery positive electrode material and its preparation method and application

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preparation example Construction

[0027] On the one hand, an embodiment of the present invention provides a method for preparing a porous carbon nanobelt lithium-sulfur battery positive electrode material. The preparation method of the porous carbon nanobelt lithium-sulfur battery cathode material comprises the following steps:

[0028] Step S01. Prepare carbon nanobelt precursor:

[0029] Formaldehyde and hydroquinone are hydrothermally reacted in an acidic solution to obtain a carbon nanobelt precursor;

[0030] Step S02. Carbonizing and activating the carbon nanobelt precursor:

[0031] The carbon nanobelt precursor is subjected to carbonization treatment and ammonia water activation treatment to obtain nitrogen and oxygen co-doped porous carbon nanobelts;

[0032] Step S03. Depositing elemental sulfur in the nitrogen-oxygen co-doped porous carbon nanobelts:

[0033] After the nitrogen-oxygen co-doped porous carbon nanobelt is mixed with elemental sulfur, heat treatment is performed in a closed environme...

Embodiment 1

[0057] This embodiment provides a porous carbon nanobelt lithium-sulfur battery cathode material and a preparation method thereof. The method for preparing the positive electrode material of the porous carbon nanobelt lithium-sulfur battery comprises the following steps:

[0058] S11: Weigh 120g of 10% dilute hydrochloric acid, 2.5g of 37% formaldehyde solution, and 1.65g of hydroquinone, and stir the three for 30 minutes until a uniform and transparent solution is formed;

[0059] S12: Pour the solution prepared in the above steps into a polytetrafluoroethylene-lined hydrothermal reaction kettle, seal the hydrothermal kettle and put it in an oven at 180°C, react for 12 hours, and cool it down to room temperature naturally;

[0060] S13: Filter the product obtained in the above steps, wash it with deionized water for 5 times, then place it in a vacuum drying oven, and dry it at 60°C for 24 hours;

[0061] S14: Grinding the dried product (carbon nanobelt precursor) into powder...

Embodiment 2

[0066] This embodiment provides a porous carbon nanobelt lithium-sulfur battery cathode material and a preparation method thereof. The method for preparing the positive electrode material of the porous carbon nanobelt lithium-sulfur battery comprises the following steps:

[0067] S11: Weigh 125g of 10% dilute hydrochloric acid, 2.8g of 37% formaldehyde solution, and 1.5g of hydroquinone, and stir the three for 20 minutes;

[0068] S12: Pour the solution prepared in the above steps into a polytetrafluoroethylene-lined hydrothermal reaction kettle, seal the hydrothermal kettle and place it in an oven at 150°C, react for 15 hours, and naturally cool to room temperature;

[0069] S13: Filter the product obtained in the above steps, wash it with deionized water for 6 times, and then place it in a common drying oven and dry it at 80°C for 15 hours;

[0070] S14: Grinding the dried product (carbon nanobelt precursor) into powder, sealed and stored for later use;

[0071] S15: Take ...

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Abstract

The invention discloses a porous carbon nanobelt positive electrode material for lithium-sulfur battery, a preparation method thereof a positive electrode of lithium-sulfur battery, and a lithium-sulfur battery. The method for preparing the porous carbon nanobelt positive electrode material for lithium-sulfur battery comprises the following steps of: preparing a carbon nanobelt precursor; carbonizing and activating the carbon nanobelt precursor; and depositing elemental sulfur in the oxynitride co-doped porous carbon nanobelt. The porous carbon nanobelt positive electrode material for lithium-sulfur battery prepared by the preparation method of the invention has electrochemical properties such as large specific surface area, good wettability and high elemental sulfur content, significantlyimproved sulfur-fixing performance, and effective inhibition of the ''shuttle effect'' of poly sulfides. The positive electrode of lithium-sulfur battery and the lithium-sulfur battery contain the positive electrode material for lithium-sulfur battery prepared by the method of the invention.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a porous carbon nanobelt lithium-sulfur battery cathode material and a preparation method and application thereof. Background technique [0002] The energy problem will be the main problem that mankind will face in the future. At present, resources such as oil and coal mines are increasingly scarce, and the development process consumes a lot of energy and causes serious pollution. Therefore, all countries are vigorously developing sustainable clean energy, which is inseparable from Energy storage and management. Energy storage materials play a very important role in energy storage and management. Secondary batteries are currently the most widely used energy storage devices, among which lithium-ion batteries occupy the main market due to their high energy density (150-200Wh / kg) and good cycle stability. However, as the current actual energy density of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M10/052B82Y30/00
CPCB82Y30/00H01M4/583H01M10/052H01M2004/021Y02E60/10
Inventor 邹继兆余良曾燮榕曾绍忠黎晓华姚跃超刘世钰涂文烜陈双双
Owner SHENZHEN UNIV
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