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Preparation method of ultra-small spherical cobalt sulfide composite flexible carbon cloth electrode material

A technology of carbon cloth electrodes and cobalt sulfide, applied in the field of electrochemistry, can solve the problems of slow electrokinetics, inconsistent platforms, and voltage hysteresis of transition metal sulfides, so as to facilitate the transmission of ions and electrons, and improve the bonding strength , Improve the effect of integrity

Inactive Publication Date: 2019-07-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrokinetics of transition metal sulfides are slow, and often have a large voltage hysteresis, that is, the platform of charge and discharge is inconsistent, which is determined by the reaction mechanism of transition metal sulfides.

Method used

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  • Preparation method of ultra-small spherical cobalt sulfide composite flexible carbon cloth electrode material
  • Preparation method of ultra-small spherical cobalt sulfide composite flexible carbon cloth electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Take analytically pure cobalt sulfate heptahydrate and analytically pure thioacetamide at a molar ratio of 1:2, add analytically pure cobalt sulfate heptahydrate to ethanol to obtain Co 2+ Red clear solution A with a concentration of 0.002mol / L;

[0032] Add analytically pure thioacetamide to deionized water equivalent to ethanol to obtain solution B;

[0033] 2) Mix solution A and solution B, and magnetically stir at a speed of 500r / min for 0.5h to form precursor solution C;

[0034] 3) Take a 3*4cm square carbon cloth as the anode, a graphite plate as the cathode, and a 40g / L ammonium dihydrogen phosphate aqueous solution as the electrolyte, oxidize it at 5V for 2min, and then wash it alternately with ultrapure water and ethanol for 3 After drying in the oven;

[0035] 4) Completely soak the pretreated carbon cloth into the precursor solution C, seal it with plastic wrap, and place it at room temperature for 30 minutes to obtain solution D;

[0036] 5) Pour the ...

Embodiment 2

[0042] 1) Take analytically pure cobalt sulfate heptahydrate and analytically pure thioacetamide according to a molar ratio of 1:5, add analytically pure cobalt sulfate heptahydrate to ethanol to obtain Co 2+ Red clear solution A with a concentration of 0.005mol / L;

[0043] Add analytically pure thioacetamide to deionized water equivalent to ethanol to obtain solution B;

[0044] 2) Mix solution A and solution B, and magnetically stir at a speed of 550r / min for 2h to form precursor solution C;

[0045] 3) Take a 3*4cm square carbon cloth as the anode, a graphite plate as the cathode, and a 45g / L ammonium dihydrogen phosphate aqueous solution as the electrolyte, oxidize it at 5V for 2min, and then wash it alternately with ultrapure water and ethanol for 5 After drying in the oven;

[0046] 4) Completely soak the pretreated carbon cloth into the precursor solution C, seal it with plastic wrap, and place it at room temperature for 45 minutes to obtain solution D;

[0047] 5) P...

Embodiment 3

[0051] 1) Take analytically pure cobalt sulfate heptahydrate and analytically pure thioacetamide at a molar ratio of 1:8, add analytically pure cobalt sulfate heptahydrate to ethanol to obtain Co 2+ Concentration is the red clear solution A of 0.008mol / L;

[0052] Add analytically pure thioacetamide to deionized water equivalent to ethanol to obtain solution B;

[0053] 2) Mix solution A and solution B, and magnetically stir at a speed of 580r / min for 3h to form precursor solution C;

[0054]3) Take a 3*4cm square carbon cloth as the anode, a graphite plate as the cathode, and a 50g / L ammonium dihydrogen phosphate aqueous solution as the electrolyte, oxidize it at 5V for 2min, and then alternately wash it with ultrapure water and ethanol for 6 After drying in the oven;

[0055] 4) Completely soak the pretreated carbon cloth into the precursor solution C, seal it with plastic wrap, and place it at room temperature for 60 minutes to obtain solution D;

[0056] 5) Pour the sol...

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Abstract

The invention relates to a preparation method of an ultra-small spherical cobalt sulfide composite flexible carbon cloth electrode material. The method comprises the steps of: adding analytically purecobaltous sulfate heptahydrate into ethanol to obtain solution A; adding analytically pure thioacetamide into the same amount of deionized water to obtain a solution B; mixing the solution A and thesolution B to form a precursor solution C; performing pretreatment of anodic oxidation on the carbon cloth; completely soaking the pretreated carbon cloth into the solution C and performing standing to obtain a solution D; pouring the solution D into a hydrothermal reaction kettle for solvothermal reaction; after the reaction is finished, taking out the carbon cloth for cleaning and vacuum drying;and after drying is finished, transferring the product into an atmosphere furnace for heat treatment to obtain the ultra-small spherical cobalt sulfide composite flexible carbon cloth electrode material. According to the cobalt sulfide composite flexible carbon cloth electrode material prepared by the invention, the cobalt sulfide particles have a particle size of 15 nm and are uniformly grown atthe surface of the carbon cloth. The carbon fibers can form a conductive framework network to increase the contact area with an electrolyte and provide growth attachment points and buffer volume expansion space for active materials.

Description

technical field [0001] The invention belongs to the preparation of negative electrode materials of sodium ion batteries in the field of electrochemistry, and in particular relates to a preparation method of an ultra-small spherical cobalt sulfide composite flexible carbon cloth electrode material. Background technique [0002] Carbon cloth is widely used as a flexible electrode material substrate because of its good mechanical strength, electrical conductivity, and flexibility. In recent years, many researchers have used active materials such as metal oxides and metal sulfides on carbon cloth for flexible electrode materials. Cobalt sulfide belongs to transition metal sulfide, which has high theoretical capacity and low cost. However, the electrokinetics of transition metal sulfides are relatively slow, and often have a large voltage hysteresis, that is, the platform of charge and discharge is inconsistent, which is determined by the reaction mechanism of transition metal s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y40/00D06M11/53D06M10/02D06M101/40
CPCB82Y40/00D06M10/025D06M11/53D06M2101/40H01M4/362H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 黄剑锋何枢薇李嘉胤曹丽云李文斌郭玲徐培光
Owner SHAANXI UNIV OF SCI & TECH