Two-dimensional nitrogen-doped hierarchical pore carbon nano-sheet as well as preparation method and application thereof to lithium/sulfur battery

A technology of hierarchical porous carbon and carbon nanosheets, applied in the field of electrochemistry, can solve problems such as energy consumption, unfavorable large-scale production, and complicated process flow

Inactive Publication Date: 2016-10-12
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of using templates in the above-mentioned prior art generally has the disadvantages of complex process flow, energy consumption and time consumption, and is not conducive to large-scale production.

Method used

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  • Two-dimensional nitrogen-doped hierarchical pore carbon nano-sheet as well as preparation method and application thereof to lithium/sulfur battery
  • Two-dimensional nitrogen-doped hierarchical pore carbon nano-sheet as well as preparation method and application thereof to lithium/sulfur battery
  • Two-dimensional nitrogen-doped hierarchical pore carbon nano-sheet as well as preparation method and application thereof to lithium/sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] The schematic diagram of the preparation process of the two-dimensional nitrogen-doped hierarchically porous carbon nanosheets in Example 1 can be found in figure 1 .

[0084] (1) Take by weighing 0.330g zinc nitrate and dissolve in 90mL water to obtain solution A (concentration of zinc nitrate in solution A is 0.019M), 0.985g 2-methylimidazole is dissolved in 90mL methanol to obtain solution B (2- The concentration of methylimidazole is 0.133M), the solution B is quickly poured into the solution A, stirred for 24h, centrifuged, washed, and dried to obtain a white solid powder, that is, a zinc metal organic framework;

[0085] (2) Transfer the white solid powder into a tube furnace, heat at 1°C min -1 The heating rate is increased to 920°C, the temperature is maintained for 2h, and then at 1°C min -1 The cooling rate is reduced to room temperature, and the finished two-dimensional nitrogen-doped hierarchical porous carbon nanosheets are obtained.

[0086] Using the s...

Embodiment 2

[0089] (1) is identical with the step (1) of embodiment 1;

[0090] (2) same as the step (1) of embodiment 1;

[0091](3) Activate the two-dimensional nitrogen-doped hierarchical porous carbon nanosheets prepared in step (2). Specifically, weigh 1 g of the two-dimensional nitrogen-doped hierarchical porous carbon nanosheets prepared in Example 1 and mix them with 4 g of KOH. Mix and place in a nickel tube furnace at 10°C min -1 The heating rate is increased to 700°C, kept at a constant temperature for 2 hours, and then at 2°C min -1 The cooling rate was lowered to room temperature, and the obtained product was placed in 10wt% HCl again, and after standing for 24 hours, it was washed and dried to obtain activated two-dimensional nitrogen-doped hierarchically porous carbon nanosheets.

[0092] Figure 2c and Figure 2d They are the SEM images of the zinc metal-organic framework obtained in step (1) of Example 2 and the activated two-dimensional nitrogen-doped hierarchical ho...

Embodiment 3

[0096] (1) Dissolve 0.330g of zinc nitrate in 90mL of water to obtain solution A, dissolve 0.985g of 2-methylimidazole in 90mL of methanol to obtain solution B, quickly pour solution B into solution A, stir for 24h, centrifuge, wash, Dried to obtain a white solid powder;

[0097] (2) Transfer the white solid powder into a tube furnace, heat at 1°C min -1 The heating rate is increased to 1100°C, kept at constant temperature for 2 hours, and then at 1°C min -1 The cooling rate is reduced to room temperature, and the finished two-dimensional nitrogen-doped hierarchical porous carbon nanosheets are obtained.

[0098] (3) Activating the two-dimensional nitrogen-doped hierarchically porous carbon material obtained in step (2), the method and conditions of activation are the same as those in step (3) of Example 2;

[0099] Using the sample two-dimensional nitrogen-doped hierarchical porous carbon nanosheet in Example 3 as the positive electrode to make a battery, and tested it, the...

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Abstract

The invention discloses a two-dimensional nitrogen-doped hierarchical pore carbon nano-sheet as well as a preparation method and application thereof to a lithium / sulfur battery. The method takes zinc salt and a water-soluble nitrogen-containing organic ligand as raw materials and two-dimensional lamellar MOF is synthesized in a water solution in one step; the two-dimensional nitrogen-doped hierarchical pore carbon nano-sheet is obtained through processes including carbonization, activation and the like. The carbon nano-sheet disclosed by the invention has micro-pores and also has micropores and macropores; the specific surface area is 200m<2>g / l to 5000m<2>g / l and the pore volume is 0.1cm<3>g / l to 4.5cm<3>g / l; the carbon nano-sheet disclosed by the invention is used as a positive electrode material of the lithium / sulfur battery, the sulfur fixing effect is obvious and the electron and ion conductivity is good, so that the obtained battery has very good circulating performance and rate performance; the first-turn discharge capacity at 0.2C can reach 1226mAh / g and the capacity rentention rate reaches 74.1 percent after 50 times of circulation. The preparation process is simple and has energy-saving and environment-friendly effects; large-scale preparation is easy to realize.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a two-dimensional nitrogen-doped hierarchical hole carbon nanosheet, a preparation method and an application thereof, in particular to a two-dimensional nitrogen-doped hierarchical hole carbon nanosheet, a preparation method and its application in a lithium-sulfur battery in the application. Background technique [0002] With the development of electric vehicles and ultra-thin electronic equipment, people put forward higher requirements for the specific energy of secondary batteries. At present, the actual energy density of commercial lithium ions based on the deintercalation mechanism is less than 200Whkg -1 , far from meeting people's needs. Lithium-sulfur battery is a new electrochemical energy storage secondary battery. During the discharge process, sulfur and metal lithium undergo a two-electron reaction, which can theoretically release 1675mAh g -1 specific capacity and 260...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/587H01M10/052Y02E60/10
Inventor 褚卫国蒋毅
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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