Cobalt-doped vanadium disulfide micron sheet and preparation method thereof

A technology of vanadium disulfide and micro-sheets, which is applied in the field of cobalt-doped vanadium disulfide micro-sheets and its preparation, which can solve problems such as hysteresis, poor cycle stability, rate performance, and pulverized charge transfer, and improve conductivity , improve electrochemical performance, promote the effect of diffusion

Inactive Publication Date: 2021-07-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium disulfide is prone to two major problems, pulverization and charge transfer hysteresis, during the electrochemical reaction process, resulting in poor cycle stability and rate performance.

Method used

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  • Cobalt-doped vanadium disulfide micron sheet and preparation method thereof
  • Cobalt-doped vanadium disulfide micron sheet and preparation method thereof
  • Cobalt-doped vanadium disulfide micron sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The invention provides a method for preparing cobalt-doped vanadium disulfide microsheets, which specifically comprises the following steps:

[0027] Step 1: 4mmol cobalt nitrate is dissolved in 100ml methanol, 16mmol bis-methylimidazole is dissolved in 100ml methanol, the methanol solution that is dissolved with bis-methylimidazole is slowly poured into the methanol solution that is dissolved with cobalt nitrate, using 500 The magnetic stirrer at ~700r / min was stirred at room temperature for 12h, and the solution was washed by methanol centrifugation three times, and the centrifuged samples were collected and dried in an oven at 60°C for 12h to obtain ZIF-67.

[0028] Step 2: Add 0.1g of ZIF-67 to 35ml of water and 7ml of ammonia water mixture, stir evenly, add a certain amount of sodium metavanadate to adjust the vanadium source concentration to 0.039mol / L, stir for 15min, add a certain amount of thio Acetamide, adjust the sulfur source concentration to 0.32mol / L, and...

Embodiment 2

[0031] The invention provides a method for preparing cobalt-doped vanadium disulfide microsheets, which specifically comprises the following steps:

[0032] Step 1: 4mmol cobalt nitrate is dissolved in 60ml methanol, 18mmol bis-methylimidazole is dissolved in 80ml methanol, the methanol solution that is dissolved with bis-methylimidazole is slowly poured into the methanol solution that is dissolved with cobalt nitrate, using 500 The magnetic stirrer at ~700r / min was stirred at room temperature for 16 hours, and the solution was washed by methanol centrifugation three times, and the centrifuged samples were collected and dried in an oven at 60°C for 12 hours to obtain ZIF-67.

[0033] Step 2: Add 0.1g of ZIF-67 to 35ml of water and 7ml of ammonia water mixture, stir evenly, add a certain amount of sodium metavanadate to adjust the concentration of vanadium source to 0.06mol / L, stir for 15min, add a certain amount of sulfur Substitute acetamide, adjust the sulfur source concentr...

Embodiment 3

[0039] The invention provides a method for preparing cobalt-doped vanadium disulfide microsheets, which specifically comprises the following steps:

[0040] Step 1: 4mmol cobalt nitrate is dissolved in 70ml methanol, 20mmol bis-methylimidazole is dissolved in 80ml methanol, the methanol solution that is dissolved with bis-methylimidazole is slowly poured into the methanol solution that is dissolved with cobalt nitrate, using 500 The magnetic stirrer at ~700r / min was stirred at room temperature for 18h, and the solution was washed by methanol centrifugation three times, and the centrifuged samples were collected and dried in an oven at 60°C for 12h to obtain ZIF-67.

[0041] Step 2: Add 0.1g of ZIF-67 to 40ml of water and 8ml of ammonia water mixture, stir evenly, add a certain amount of sodium metavanadate to adjust the concentration of vanadium source to 0.1mol / L, stir for 15min, add a certain amount of sulfur Substitute acetamide, adjust the sulfur source concentration to 0....

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Abstract

The invention discloses a cobalt-doped vanadium disulfide micron sheet and a preparation method thereof. The preparation method comprises the following steps: 1) mixing a cobalt nitrate methanol solution with the concentration of 0.04-0.08 mol / L and a di-methylimidazole methanol solution with the concentration of 0.16-0.32 mol / L according to the molar ratio of cobalt nitrate to di-methylimidazole being 1:(4-6), stirring, centrifuging, washing and drying to obtain ZIF-67; (2) adding the ZIF-67 obtained in the step (1) into water, adjusting the pH value to be alkaline, uniformly stirring, adding a vanadium source and a sulfur source, and stirring to obtain a mixed solution; wherein the mass ratio of the added vanadium source to the ZIF-67 is (2-7):1, the concentration of the vanadium source in the obtained mixed solution is 0.039 mol / L to 0.12 mol / L, the concentration of the sulfur source is 0.32 mol / L to 0.78 mol / L; (3) heating the mixed solution obtained in the step (2) to 160-180 DEG C, keeping the temperature for 24 hours, naturally cooling, and carrying out suction filtration, washing and freeze drying to obtain the cobalt-doped vanadium disulfide micron sheet. The preparation method is simple in process and easy to obtain, and the prepared cobalt-doped vanadium disulfide micron sheet has the capacity of 390 mAh / g under the current density of 0.5 A / g as a sodium-ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of battery electrode materials, and in particular relates to a cobalt-doped vanadium disulfide micro-sheet and a preparation method thereof. Background technique [0002] As one of the transition metal sulfides, vanadium disulfide is regarded as a very promising anode material for sodium-ion batteries due to its variable V valence state, metallic state characteristics, large interlayer spacing, and weak interlayer bonding force. However, vanadium disulfide is prone to two major problems, pulverization and charge transfer hysteresis, during the electrochemical reaction process, resulting in poor cycle stability and rate performance. (Z.Hu, Q.Liu, S.-L.Chou, S.X.Dou, Advances and Challenges in Metal Sulfides / Selenides for Next-Generation Rechargeable Sodium-Ion Batteries[J].Advanced Materials,(2017)1700606.) Doping in metal sulfides can introduce some lattice changes (such as distortion, expansion, and contraction), va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/5815H01M4/626H01M4/62H01M10/054B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 黄剑锋王羽偲嘉李嘉胤曹丽云王芳敏罗晓敏胡云飞刘长青
Owner SHAANXI UNIV OF SCI & TECH
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