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Research of surface-modified nitrogen-doped porous carbon-sulfur composite material in positive electrode of lithium-sulfur battery

A technology of nitrogen-doped porous carbon and composite materials, applied in battery electrodes, lithium batteries, nanotechnology for materials and surface science, etc., can solve problems such as loss of active materials, short life of electrodes, and theoretical capacity limitations. Achieve the effects of alleviating the volume expansion problem, stabilizing the material structure, and improving battery performance

Inactive Publication Date: 2016-09-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The theoretical specific capacity of the currently commercialized lithium-ion battery is limited by its own theoretical capacity (the theoretical specific capacity is 300mAh / g), which obviously cannot meet the demand, while the theoretical capacity of the new lithium-sulfur battery is about five times the theoretical capacity of the commercial lithium-ion battery. times (theoretical specific capacity is 1675mAh / g, specific energy is 2500Wh / kg), considered to be one of the most promising high-energy batteries
[0003] However, the current cathode materials for lithium-sulfur batteries are mainly elemental sulfur and its compounds, which face two major challenges: (1) The conductivity of elemental sulfur is low, resulting in low sulfur loading on the cathode
(2) During the charging and discharging process of the battery, the polysulfide produced by the positive electrode dissolves in the electrolyte, resulting in the loss of active materials and the electrode life is not long

Method used

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  • Research of surface-modified nitrogen-doped porous carbon-sulfur composite material in positive electrode of lithium-sulfur battery
  • Research of surface-modified nitrogen-doped porous carbon-sulfur composite material in positive electrode of lithium-sulfur battery
  • Research of surface-modified nitrogen-doped porous carbon-sulfur composite material in positive electrode of lithium-sulfur battery

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Dissolve 4g of o-phenylenediamine in 2mol / L hydrochloric acid solution, ultrasonically disperse it evenly, then add 10g of nano-silica ball hard template in turn, and add 20mL of 1mol / L ammonium persulfate aqueous solution under stirring , and using an ice-water bath to maintain the temperature at 0°C for 24 hours of polymerization, then centrifuged and dried to obtain a solid product.

[0027] (2) Under the protection of nitrogen, the solid product was heated up to 900°C at 10°C / min and calcined for 1 hour, and then cooled down to room temperature naturally.

[0028] (3) Add the above solid to 4 mol / L ammonium bifluoride aqueous solution to etch the silica nanospheres, stir at room temperature for 24 hours, wash with deionized water, and dry at 80°C for 12 hours to obtain a nitrogen-doped porous carbon material solid product.

[0029] (4) After mixing and grinding the nitrogen-doped porous carbon material and elemental sulfur, heat treatment at 160-200° C. under t...

Embodiment 2

[0032] (1) Dissolve 4g of o-phenylenediamine in 2mol / L hydrochloric acid solution, ultrasonically disperse it evenly, then add 10g of nano-silica ball hard template in turn, and add 20mL of 1mol / L ammonium persulfate aqueous solution under stirring , and using an ice-water bath to maintain the temperature at 0°C for 24 hours of polymerization, then centrifuged and dried to obtain a solid product.

[0033] (2) Under the protection of nitrogen, the solid product was heated up to 900°C at 10°C / min and calcined for 1 hour, and then cooled down to room temperature naturally.

[0034] (3) The above solid was added to 4 mol / L ammonium bifluoride aqueous solution to etch the silica nanospheres, stirred at room temperature for 24 h, washed with deionized water, and dried at 80° C. for 12 h.

[0035] (4) The obtained solid was calcined at 5° C. / min to 900° C. for 60 minutes under the condition of ammonia gas, and then naturally lowered to room temperature to obtain an activated nitrogen...

Embodiment 3

[0039] (1) Dissolve 4g of o-phenylenediamine in 2mol / L hydrochloric acid solution, ultrasonically disperse it evenly, then add 10g of silica ball hard template in turn, add 20mL of 1mol / L ammonium persulfate aqueous solution under stirring, And use an ice-water bath to keep the temperature at 0°C for 24 hours of polymerization, then centrifuge and dry to obtain a solid product.

[0040] (2) The solid product was calcined at a rate of 10° C. / min to 900° C. for 1 h under the protection of nitrogen, and then naturally cooled to room temperature.

[0041] (3) The above solid was added to 4 mol / L ammonium bifluoride aqueous solution to etch the silica nanospheres, stirred at room temperature for 24 h, washed with deionized water, and dried at 80° C. for 12 h.

[0042] (4) The obtained solid was calcined at 5° C. / min to 900° C. for 60 minutes under the condition of ammonia gas, and then naturally lowered to room temperature to obtain an activated nitrogen-doped connected porous carb...

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Abstract

The invention provides a research of a surface-modified nitrogen-doped porous carbon-sulfur composite material in a positive electrode of a lithium-sulfur battery. The nitrogen-doped porous carbon material is prepared by a hard template method and an ammonia activation method; the carbon material is mixed with sublimed sulfur powder evenly; the mixture is heated to synthesize the carbon-sulfur composite material in an airtight condition; and a film is formed by polymerizing dopamine on the porous carbon surface and then is chemically crosslinked with graphene oxide to obtain the surface-modified nitrogen-doped porous carbon-sulfur composite material. The surface of the composite material is evenly coated with polydopamine and the graphene oxide; and a nitrogen-containing functional group in the polydopamine and an oxygen-containing functional group in the graphene oxide can well fix sulfur and inhibit shuttling of polysulphide. Furthermore, a similar shell structure is formed on the surface of the carbon material through the chemical crosslinking action of the polydopamine and the graphene oxide to stabilize the material structure, so that the composite material with good performance for the positive electrode of the lithium-sulfur battery is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a preparation method of a lithium-sulfur battery positive electrode composite material, and a positive electrode and a battery made thereof. Background technique [0002] Converting the abundant and diverse primary energy in nature into renewable secondary energy is crucial to the sustainable development of the earth on which we live, so the development of advanced electrochemical energy storage devices is imminent. Among them, high-performance battery energy storage devices can meet the requirements of the future society for efficient, clean, economical and safe energy systems. The theoretical specific capacity of the currently commercialized lithium-ion battery is limited by its own theoretical capacity (the theoretical specific capacity is 300mAh / g), which obviously cannot meet the demand, while the theoretical capacity of the new lithium-sulfur battery is abo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/5815H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 杨文陈平平张小玲
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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