Wrinkled polyhedral cobalt sulfide electrode material and preparation method thereof

A technology of electrode materials and polyhedrons, applied in the field of electrochemistry, can solve problems such as difficult acquisition of raw materials and complex operation steps of synthesis methods, and achieve the effects of reducing production steps, improving electrical conductivity, and reducing costs

Active Publication Date: 2020-10-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, cobalt sulfide series substances, especially Co 9 S 8 It is widely used in the field of photo / electrocatalysis, but most of the synthesis methods are very complicated, and the raw materials used are not easy to obtain

Method used

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  • Wrinkled polyhedral cobalt sulfide electrode material and preparation method thereof
  • Wrinkled polyhedral cobalt sulfide electrode material and preparation method thereof
  • Wrinkled polyhedral cobalt sulfide electrode material and preparation method thereof

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preparation example Construction

[0028] A preparation method of a wrinkled polyhedral cobalt sulfide electrode material of the present invention comprises the following steps,

[0029] Step 1, dissolve cobalt acetate tetrahydrate and thiourea in ethanol to obtain solution A; in solution A, Co 2+ and S 2- The molar ratio is 1:(0.5-0.7);

[0030] Step 2, the 2-methylimidazole that concentration is 0.4-0.8mol / L joins in the solution A, makes mixed solution; The volume ratio of solution A and 2-methylimidazole aqueous solution is (30-40):(10- 15);

[0031] Step 3, adding carbon cloth to the mixed solution, and heating for reaction;

[0032] In step 4, after the reaction is completed, the carbon cloth is taken out, washed and dried to obtain a cobalt sulfide electrode material in the shape of a wrinkled polyhedron.

[0033] In the present invention, cobalt sulfide is grown on the surface of carbon cloth by using carbon cloth as a self-supporting matrix in the preparation process. In the preparation process of...

Embodiment 1

[0037] 1) Dissolve cobalt acetate tetrahydrate and thiourea in anhydrous ethanol with a cobalt source and sulfur source molar ratio of 1:0.5, and magnetically stir at 700r / min for 20min to obtain a clear solution A;

[0038] 2) 2-Methylimidazole was added to deionized water, the concentration of the prepared solution was 0.4mol / L, and magnetic stirring was carried out for 20 minutes to obtain a clear solution B; the volume ratio of absolute ethanol to 2-Methylimidazole aqueous solution was 30mL:10mL;

[0039]3) Mix solution A and solution B into a polytetrafluoroethylene-lined hydrothermal reaction kettle, add pretreated carbon cloth at the same time, place it in an oven for heat treatment; the temperature of heat treatment rises from room temperature to 90 ℃, the heating reaction time is 10h; the filling degree of the mixed solution and the pretreated carbon cloth in the hydrothermal reactor is 40%. The pretreatment of the carbon cloth was ultrasonicated with acetone for 2 ho...

Embodiment 2

[0045] 1) Dissolve cobalt acetate tetrahydrate and thiourea in anhydrous ethanol with a cobalt source and sulfur source molar ratio of 1:0.55, and magnetically stir at 700r / min for 20min to obtain a clear solution A;

[0046] 2) Add 2-methylimidazole to deionized water, prepare the solution at a concentration of 0.5mol / L, and stir magnetically for 20 minutes to obtain a clear solution B; the volume ratio of absolute ethanol to 2-methylimidazole aqueous solution is 32mL:11mL;

[0047] 3) Mix solution A and solution B into a polytetrafluoroethylene-lined reaction kettle, add pretreated carbon cloth at the same time, place it in an oven for heat treatment; the temperature of heat treatment rises from room temperature to 100°C, The heating reaction time is 8 hours; the filling degree of the mixed solution and the pretreated carbon cloth in the hydrothermal reactor is 45%. The pretreatment of the carbon cloth was ultrasonicated with acetone for 3 hours, then the carbon cloth was ta...

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Abstract

The invention relates to a preparation method of a wrinkled polyhedral cobalt sulfide electrode material. The preparation method comprises the following steps of: step 1, dissolving cobaltous acetatetetrahydrate and thiourea in ethanol to obtain a solution A, wherein a molar ratio of Co<2+> to S<2-> in the solution A is 1: (0.5-0.7); step 2, adding 2-methylimidazole with the concentration of 0.4mol/L-0. 8mol/L into the solution A to prepare a mixed solution, wherein a volume ratio of the solution A to a 2-methylimidazole aqueous solution is (6-8):(2-3); step 3, adding carbon cloth into the mixed solution, and heating the mixture for reaction; and step 4, after the reaction is finished, taking out the carbon cloth, cleaning and drying the carbon cloth to obtain the wrinkled polyhedral cobalt sulfide electrode material step. According to the preparation method, the carbon cloth is used as a self-supporting base body, cobalt sulfide grows on the surface of the carbon cloth, the manufacturing steps are reduced, the 2-methylimidazole aqueous solution is added in the preparation process, a redundant cobalt source fully reacts to form a Co-MOF precursor, cobalt sulfide grows on the surface of a Co-MOF sheet, the Co-MOF sheet is recombined into a polyhedral structure, and a polyhedral structure is formed.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a preparation method of a wrinkled polyhedral cobalt sulfide electrode material. Background technique [0002] Potassium-ion batteries have attracted the attention of some researchers in recent years, mainly because potassium has abundant reserves and a wide range of sources, and has similar physical and chemical properties to lithium and sodium. The standard electrode potential of K / K+ is closer to Li / Li+, which makes potassium-ion batteries more advantageous than sodium-ion batteries in terms of output voltage and capacity. However, the radius of potassium ions is larger than that of lithium and sodium, so potassium ions cannot achieve reversible intercalation / deintercalation in the negative electrode materials of most lithium-ion batteries, resulting in poor electrochemical performance of the materials. Therefore, it is particularly important to design suitable electrode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/136H01M4/1397H01M4/66H01M10/054
CPCH01M4/136H01M4/1397H01M4/5815H01M4/625H01M4/628H01M4/663H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 黄剑锋何枢薇李嘉胤曹丽云王芳敏
Owner SHAANXI UNIV OF SCI & TECH
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