Preparation method of a two-dimensional nanosheet structure transition metal-n-c material and its application in lithium-sulfur batteries

A two-dimensional nano-transition metal technology, applied in the direction of lithium batteries, structural parts, battery electrodes, etc., to achieve the effects of enhanced conductivity, uniform nitrogen doping, and accelerated charge transfer

Active Publication Date: 2021-10-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, how to prepare two-dimensional M-N-C materials and use them as positive sulfur supports to improve the catalytic performance of polysulfides is still facing a huge challenge.

Method used

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  • Preparation method of a two-dimensional nanosheet structure transition metal-n-c material and its application in lithium-sulfur batteries

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Experimental program
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Effect test

Embodiment 1

[0017] Weigh 3g of sodium chloride, 0.7g of glucosamine hydrochloride and 0.1g of ferric nitrate, dissolve them in 20mL of deionized water, stir and react for 40min, freeze at -12°C for 24h to form an ice crystal template, and freeze-dry for 12h to obtain carbonized Precursor.

[0018] In a tubular heating furnace, the carbonized precursor was heated to 800 °C for 3 h at a rate of 2 °C / min in an argon atmosphere, cooled to room temperature and then acid-washed with 1 mol / L HCl solution to wash away the salt template and load. The iron nanoparticles were freeze-dried to obtain a two-dimensional nanosheet structure Fe-N-C material. After the assembled battery test, the performance can reach 805mAh g under the test condition of 0.1C -1 .

Embodiment 2

[0020] Weigh 5g of sodium chloride, 1g of glucosamine hydrochloride and 0.3g of cobalt chloride, dissolve them in 30mL of deionized water, stir and react for 30min, freeze at -18°C for 12h, and freeze-dry for 12h to form an ice crystal template to obtain carbonized Precursor.

[0021] In a tubular heating furnace, the carbonized precursor was heated to 900 °C for 3 h at a rate of 2 °C / min in an argon atmosphere, and was cooled to room temperature and then acid-washed with 1 mol / L HCl solution to wash away the salt template and load. Cobalt nanoparticles were freeze-dried to obtain a two-dimensional nanosheet structure Co-N-C material. After the assembled battery test, the performance can reach 974mAh g under the test condition of 0.1C -1 .

Embodiment 3

[0023] Weigh 5g of sodium chloride, 0.5g of glucosamine hydrochloride and 0.1g of cobalt nitrate, dissolve in 25mL of deionized water, stir and react for 30min, freeze at -18°C for 12h, and freeze-dry for 12h to form an ice crystal template to obtain carbonized Precursor.

[0024] In a tubular heating furnace, the carbonized precursor was heated to 900 °C for 2 h at a rate of 2 °C / min in an argon atmosphere. After cooling to room temperature, it was acid-washed with 1 mol / L HCl solution to wash away the salt template and load. Cobalt nanoparticles, freeze-dried, and finally obtained a uniformly distributed ultrathin two-dimensional nanosheet structure Co-N-C material. After the assembled battery test, the performance can reach 1100mAh g under the test condition of 0.1C -1 .

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Abstract

A preparation method of a transition metal (M)-N-C material with a two-dimensional nanosheet structure and its application in lithium-sulfur batteries, belonging to the technical field of electrode material preparation. The preparation method is as follows: dissolving sodium chloride, glucosamine hydrochloride and transition metal source in deionized water, stirring and reacting, and freeze-drying to obtain a carbonized precursor; Pickling with dilute hydrochloric acid solution washes off the salt template and the loaded transition metal nanoparticles to obtain a two-dimensional nanosheet structure M‑N‑C material. The present invention adopts the "salt template" and the "ice template" method in the freezing process to realize the two-dimensional nanosheet structure, provide large-area active sites for sulfur fixation and sulfur conversion, promote charge transfer, and enhance conductivity; The glucosamine hydrochloride can achieve uniform nitrogen doping and can effectively adsorb polysulfides; after high-temperature carbonization, the generated M-N bonds can be used as catalytic active centers to effectively catalyze the conversion of polysulfides, and then obtain excellent lithium Sulfur battery performance.

Description

technical field [0001] The invention relates to a preparation method of a transition metal-N-C material with a two-dimensional nanosheet structure and its application in a lithium-sulfur battery, belonging to the technical field of electrode material preparation. Background technique [0002] Lithium-sulfur batteries are considered to be one of the most promising next-generation secondary batteries due to their high theoretical energy density, abundant resources, non-toxicity of sulfur as the positive active material, environmental friendliness, and low cost. However, there are still challenges to realize the practical application and eventual commercialization of lithium-sulfur batteries. For example, the electrical conductivity is poor, and during the reaction, the kinetic transformation of polysulfides is slow, and the shuttle effect occurs, and the polysulfides (Li 2 S x ) intermediate dissolves into the electrolyte, passes through the separator, diffuses to the negati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/00B01J37/00B01J37/08B01J37/32H01M4/62H01M10/052
CPCB01J27/24B01J35/0033B01J37/0018B01J37/082B01J37/084B01J37/32H01M4/628H01M10/052Y02E60/10
Inventor 张旭曲宁杨仕轩雷达米盼盼
Owner DALIAN UNIV OF TECH
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