Graphene-like carbon material/sulphur composite cathode material for lithium-sulphur battery, and preparation method and application thereof

A composite positive electrode material, graphene carbon technology, applied in nanotechnology for materials and surface science, battery electrodes, lithium batteries, etc., can solve the problems of small specific capacity of sulfur electrodes, low sulfur loading, and poor cycle performance , to achieve the effect of high sulfur load, large sulfur load and improved cycle performance

Inactive Publication Date: 2016-10-26
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the common problems of low sulfur loading, low specific capacity of sulfur electrodes, low energy density and poor cycle performance of the three-dimensional graphene/sulfur composite cathode materials in the prior art, and provi...

Method used

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  • Graphene-like carbon material/sulphur composite cathode material for lithium-sulphur battery, and preparation method and application thereof
  • Graphene-like carbon material/sulphur composite cathode material for lithium-sulphur battery, and preparation method and application thereof
  • Graphene-like carbon material/sulphur composite cathode material for lithium-sulphur battery, and preparation method and application thereof

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Embodiment 1

[0044] Add 2.0 g of macroporous anion exchange resin into 2 L of KOH solution with a concentration of 3 g / L, and react with mechanical stirring at room temperature for 10 h. After filtering, it was transferred to a tube furnace, and under the protection of nitrogen, it was heated to 800°C at a heating rate of 10°C / min, and kept for 6 hours. After carbonization, a three-dimensional porous graphene-like carbon material with micro-nano structure was obtained. The BET test found that its specific surface area is 3002m 2 / g, the pore diameter of the micropores is ≤2nm, and the proportion of micropores to the entire pore structure is 70%. The three-dimensional porous graphene-like carbon material with micro-nano structure and sulfur powder were mixed by high-speed ball milling at a mass ratio of 2:8 for 2 hours, and then under the protection of argon, the temperature was raised to 155°C and kept for 24 hours to obtain a graphene-like carbon material / sulfur composite cathode materi...

Embodiment 2

[0049] Add 2.0 g of macroporous anion exchange resin into 2 L of NaOH solution with a concentration of 4 g / L, and react with mechanical stirring at room temperature for 10 h. After filtering, it was transferred to a tube furnace, and under the protection of nitrogen, it was heated to 900°C at a heating rate of 5°C / min, and kept for 8 hours. After carbonization, a three-dimensional porous graphene-like carbon material with a micro-nano structure was obtained. The BET test found that its specific surface area is 1870m 2 / g, the pore diameter of the micropores is ≤2nm, and the proportion of micropores to the entire pore structure is 50%. The three-dimensional porous graphene-like carbon material with micro-nano structure and sulfur powder were mixed by high-speed ball milling at a mass ratio of 2:8 for 2 hours, and then under the protection of argon, the temperature was raised to 155°C and kept for 24 hours to obtain a graphene-like carbon material / sulfur composite cathode mate...

Embodiment 3

[0051] Add 2.0g of macroporous anion exchange resin to 3L of Na with a concentration of 1.8g / L 2 CO 3 In the solution, the reaction was mechanically stirred at room temperature for 24h. After filtration, it was transferred to a tube furnace, and under the protection of nitrogen, it was heated to 1100°C at a heating rate of 15°C / min, and kept for 7 hours. After carbonization, a three-dimensional porous graphene-like carbon material with a micro-nano structure was obtained. The BET test found that the specific surface area of ​​the material is 1666m 2 / g, the pore diameter of the micropores is less than or equal to 2nm, and the proportion of micropores to the entire pore structure is 60%. The three-dimensional porous graphene-like carbon material with micro-nano structure and sulfur powder are mixed by high-speed ball milling at a mass ratio of 2:8 for 2 hours, then heated to 155 °C under the protection of argon, and kept for 24 hours to obtain a graphene-like carbon material / ...

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Abstract

The invention discloses a graphene-like carbon material/sulphur composite cathode material for a lithium-sulphur battery, and a preparation method and application thereof. The cathode material is formed by a three-dimensional porous graphene-like carbon material having a micro-nanostructure and elemental sulphur in a composite manner. The preparation method disclosed by the invention is simple to operate and low in cost; the utilization rate of the prepared composite cathode material for the lithium-sulphur battery is high; and the cycle performance of the lithium-sulphur battery is greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for lithium-sulfur batteries, in particular to a graphene-like carbon material / sulfur composite positive electrode material for lithium-sulfur batteries and its preparation method and application. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronics, electric vehicles, and plug-in hybrid electric vehicles, there is an urgent need to develop batteries with higher energy density. As the specific capacity of lithium-ion battery cathode materials is limited, it is difficult to further increase the energy density of lithium-ion batteries. At the same time, increasing the energy density by increasing the voltage platform of the cathode material will bring safety problems. Changing the cathode material from the "deintercalation mechanism" to the "conversion reaction chemical mechanism" is expected to obtain materials wit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/38H01M4/628H01M10/052Y02E60/10
Inventor 张治安赖延清王鹏张凯李劼
Owner CENT SOUTH UNIV
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