Nitrogen-enriched carbon shell cladded nano core-shell-structure carbonaceous carrier as well as preparation method and application thereof

A nano-core-shell and carbonaceous technology, applied in the field of electrochemical energy, can solve the problem that the cycle life of lithium-sulfur batteries cannot meet the requirements of industrialization, and achieve excellent physical and chemical adsorption capabilities of strong polysulfide ions, maintain high capacity, The effect of easy scale production

Active Publication Date: 2017-05-24
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, the cycle life of lithium-sulfur batteries still cannot meet the requirements of industrialization

Method used

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  • Nitrogen-enriched carbon shell cladded nano core-shell-structure carbonaceous carrier as well as preparation method and application thereof
  • Nitrogen-enriched carbon shell cladded nano core-shell-structure carbonaceous carrier as well as preparation method and application thereof
  • Nitrogen-enriched carbon shell cladded nano core-shell-structure carbonaceous carrier as well as preparation method and application thereof

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preparation example Construction

[0048] In some preferred embodiments, the preparation method includes: carbonizing the precursor at a temperature of 100°C to 500°C. Further, the carbonization treatment time adopted is 12h-24h.

[0049] One aspect of the present invention provides a sulfur-carbon composite material, comprising:

[0050] The nano-core-shell structure carbonaceous carrier coated with nitrogen-rich carbon shell;

[0051] And, the sulfur loaded on the carbonaceous carrier;

[0052] Wherein, the sulfur-carbon composite material contains 50-90 wt% sulfur (mass percentage).

[0053] One aspect of the present invention provides a method of making the sulfur-carbon composite material, comprising:

[0054] Coating at least one carbon material with a nitrogen-containing polymer to form a precursor with a core-shell structure;

[0055] The precursor is uniformly mixed with sulfur, and carbonized in a protective atmosphere to form the sulfur-carbon composite material.

[0056] In some embodiments, th...

Embodiment 1

[0071] Example 1: Preparation of nitrogen-rich carbon shell precursor materials (NCNT@NCS and NG-NCNT@NCS)

[0072] Concentrated acid (volume ratio H 2 SO 4 :HNO 3 =3:1) to treat carbon nanotubes (CNTs), and then nitrogen-doped carbon nanotubes (NCNTs) with a nitrogen content of 0.62at% by feeding ammonia gas under the temperature condition of 750°C for nitriding treatment. Weigh 100 mg of NCNT and ultrasonically disperse it in ultrapure water, slowly add 150 mg of aniline (ANI) solution dropwise, and adjust the pH value to between 1 and 2 with hydrochloric acid. Under ice-water bath conditions, an appropriate amount of ammonium persulfate was slowly added dropwise and stirred for 24 hours. After the reaction was completed, the mixture was filtered, washed, and vacuum-dried to obtain a PANI-coated NCNT material (NCNT@PANI), which is a one-dimensional nitrogen-rich nanomaterial.

[0073] Introduce nitrogen-doped graphene to disperse ultrasonically with NCNT in a certain prop...

Embodiment 2

[0076] Example 2: Preparation and Characterization of Low Temperature Carbonization of Nitrogen-rich Carbon Shell PANI Coated Carbon-rich Nano

[0077] Under the protection of argon, the one-dimensional nitrogen-enriched nanomaterial (NCNT@PANI) obtained in Example 1 was first carbonized at 155° C. for 12 hours, and then carbonized at 180° C. for 12 hours to obtain the carbon nanomaterial ( NCNT@NCS), its nitrogen content is 11.1 at%.

[0078] Three-dimensional nano-nitrogen-rich nanomaterials (NG-NCNT@PANI) were subjected to low-temperature carbonization under the same conditions to obtain nitrogen-rich nano-carbon materials (NG-NCNT@NCS), whose nitrogen content was as high as 12.6 at%.

[0079] From figure 2 It can be seen from the Raman spectrum shown that after coating with PANI, both NCNT@PANI and NG-NCNT@PANI can display the peak of PANI at wavenumbers 1402 and 1235. After low-temperature carbonization treatment, the characteristic peaks of PANI are all weakened or ev...

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Abstract

The invention discloses a nitrogen-enriched carbon shell cladded nano core-shell-structure carbonaceous carrier as well as a preparation method and application thereof. The carbonaceous carrier comprises a carbonaceous inner core and a nitrogen-enriched carbon shell covering the carbonaceous inner core. The carbonaceous carrier provided by the invention not only has abundant doping amount of a nitrogen element, but also has high polysulfide ion physical and chemical adsorption capabilities and excellent electrochemical stability; when the carbonaceous carrier is applied to a lithium-sulfur battery and is used as a positive electrode of a lithium-sulfur secondary battery, high capacity and rate circulating performance, and ultrahigh electrochemical stability can be kept even if the lithium-sulfur secondary battery is circularly charged and discharged for a long period, so that the whole electrochemical performance of the battery is improved; and meanwhile, a preparation process of the carbonaceous carrier has moderate conditions, low energy consumption and low cost and large-scale production is easy to realize.

Description

technical field [0001] The invention relates to a nano material, in particular to a carbon carrier with a nano core-shell structure coated with a nitrogen-rich carbon shell, a preparation method and application thereof, and belongs to the field of electrochemical energy. Background technique [0002] New high-energy-density, long-cycle-life, green, and low-cost secondary batteries have become research hotspots in the field of energy storage in recent years. Due to the potential advantages of high capacity, high energy density, and cheap constituent elements, lithium-sulfur batteries have quickly attracted the attention and attention of energy departments and energy companies in various countries, and have gradually become the research focus of a new generation of high-energy-density batteries. The successful industrialization of lithium-sulfur batteries will definitely generate huge value in the fields of electric vehicle power batteries, smart grids, and clean energy large-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/625H01M4/628Y02E60/10
Inventor 张跃钢王健蔺洪振李宛飞侯远程双
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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