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Method for preparing Co3V2O8 with different morphologies by controlling hydrothermal time and Co3V2O8 with morphologies

A technology of heat time and water control, applied in chemical instruments and methods, inorganic chemistry, cobalt compounds, etc., to achieve the effect of strong controllability

Active Publication Date: 2016-11-23
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Current research reports mainly include [Fangfang Wu, Shenglin Xiong, Yitai Qian, and Shu-Hong Yu, Hydrothermal Synthesis of Unique Hollow Hexagonal Prismatic Pencils of Co 3 V 2 o 8 ·nH 2 O: A New Anode Material for Lithium-Ion Batteries], and [Gongzheng Yang, Hao Cui, Guowei Yang, and Chengxin Wang, Self-Assembly of Co 3 V 2 o 8 Multilayered Nanosheets:Controllable Synthesis,Excellent Li-StorageProperties,and Investigation of Electrochemical Mechanism], but none of the Co 3 V 2 o 8 The change process of the morphology with the reaction time is described

Method used

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  • Method for preparing Co3V2O8 with different morphologies by controlling hydrothermal time and Co3V2O8 with morphologies
  • Method for preparing Co3V2O8 with different morphologies by controlling hydrothermal time and Co3V2O8 with morphologies
  • Method for preparing Co3V2O8 with different morphologies by controlling hydrothermal time and Co3V2O8 with morphologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Add ammonium metavanadate into deionized water at 70°C, and keep stirring for 5 minutes, the solution becomes light yellow-green;

[0050] (2) Add NaOH to the solution, and continue to stir for about 5 minutes until the solution becomes transparent and colorless;

[0051] (3) CoCl 2 ·6H 2 O was added to the above solution, and continued to stir for 10 minutes until the solution became transparent reddish brown, wherein the range of Co:V molar ratio was 1:3, and the concentration range of OHˉ was 0.03mol / L;

[0052] (4) Transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 160° C., and the time range is 5min-16h;

[0053] (5) Get the reaction sample whose reaction time is within 30min;

[0054] (6) Cool the above reaction sample to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 60°C for 4 hours, put it into a tube furnace, calcinate it to 250°C, keep it for more than 2 ...

Embodiment 2

[0056] (1) Add ammonium metavanadate to deionized water at 80°C, and keep stirring for 10 minutes, the solution turns into light yellow-green;

[0057] (2) Add LiOH to the solution, and keep stirring for about 10 min until the solution becomes transparent and colorless;

[0058] (3) Co(NO 3 ) 2 ·6H 2 O was added to the above solution, and continued to stir for 10-15 minutes until the solution became transparent reddish brown, wherein the range of Co:V molar ratio was 1:5.5, and the concentration range of OHˉ was 0.035mol / L;

[0059] (4) transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 220° C., and the time range is 5min-16h;

[0060] (5) get the reaction sample that the reaction time is 1-3h,

[0061] (6) Cool the above reaction sample to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 90°C for 6h, put it into a tube furnace, calcinate it to 350°C, keep it for more than 2h, ...

Embodiment 3

[0063] (1) Add ammonium metavanadate into deionized water at 75°C, and keep stirring for 7 minutes, the solution turns light yellow-green;

[0064] (2) Add KOH to the solution, and continue stirring for about 8 minutes until the solution becomes transparent and colorless;

[0065] (3) Co(Ac) 2 4H 2 O was added to the above solution, and continued to stir for 12 minutes until the solution became transparent reddish brown, wherein the range of Co:V molar ratio was 1:4, and the concentration range of OHˉ was 0.032mol / L;

[0066] (4) Transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 190° C., and the time range is 5min-16h;

[0067] (5) getting reaction time is the reaction sample of 3-6h;

[0068] (6) Cool the above reaction sample to room temperature, wash it several times with deionized water and absolute ethanol, dry it at a temperature of 75°C for 5h, put it into a tube furnace, calcinate it to 300°C, keep it for more th...

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Abstract

The invention provides a method for preparing Co3V2O8 with different morphologies by controlling hydrothermal time and the corresponding Co3V2O8 with the corresponding morphologies. The method includes the steps: adding ammonium metavanadate into 70-80 DEG C deionized water, adding NaOH, or LiOH or KOH into solution, adding CoCl2*6H2O, or Co (NO3)2*6H2O, or Co (Ac)2*4H2O or CoSO4*7H2O into the solution, transferring the prepared solution into a hydrothermal reactor, performing reaction at the temperature of 160-220 DEG C and respectively taking reaction samples with reaction time within 30 minutes, equal to 1-3 hours, equal to 3-6 hours and longer than 7 hours; respectively cooling the reaction samples in different time periods to room temperature, washing the reaction samples for a couple of times by the deionized water and absolute ethyl alcohol, drying the reaction samples and calcining the reaction samples at the temperature of 250-350 DEG C to finally obtain the Co3V2O8 with the different morphologies. The method is simple, rapid, economical and environmentally friendly by means of hydrothermal reaction, time variation can be directly controlled, corresponding sample morphologies are compounded, and controllability is quite high.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium battery and supercapacitor materials, especially the preparation of Co with different shapes by controlling the hydrothermal time. 3 V 2 o 8 method and corresponding Co 3 V 2 o 8 . Background technique [0002] co 3 V 2 o 8 Due to its unique crystal structure and good electrical conductivity, it has great application prospects in lithium-ion batteries and supercapacitors. The preparation method is mainly a physical method and a chemical method, the process is simple, the cost is low and the effect is obvious. Current research reports mainly include [Fangfang Wu, Shenglin Xiong, Yitai Qian, and Shu-Hong Yu, Hydrothermal Synthesis of Unique Hollow Hexagonal Prismatic Pencils of Co 3 V 2 o 8 ·nH 2 O: A New Anode Material for Lithium-Ion Batteries], and [Gongzheng Yang, Hao Cui, Guowei Yang, and Chengxin Wang, Self-Assembly of Co 3 V 2 o 8 Multilayered Nanosheets:Control...

Claims

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Application Information

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IPC IPC(8): C01G51/00
CPCC01G51/00C01P2002/72C01P2004/03C01P2004/20C01P2004/30C01P2004/32C01P2004/62C01P2006/40
Inventor 冯婷婷杨俭吴孟强刘文龙
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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