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Preparation method of flaky molybdenum selenide/carbon fiber sheet composite material

A technology of carbon fiber cloth and molybdenum diselenide, which is applied in the field of electrochemistry, can solve the problems of limited specific capacity and low energy density of pure carbon fiber, achieve the effects of improving structural stability and conductivity, simple experimental methods, and inhibiting agglomeration

Active Publication Date: 2019-03-01
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Carbon fiber has excellent chemical stability, high porosity three-dimensional structure and relatively good processing performance, but pure carbon fiber has limited specific capacity and low energy density

Method used

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  • Preparation method of flaky molybdenum selenide/carbon fiber sheet composite material
  • Preparation method of flaky molybdenum selenide/carbon fiber sheet composite material
  • Preparation method of flaky molybdenum selenide/carbon fiber sheet composite material

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preparation example Construction

[0028] The preparation method of sheet molybdenum diselenide / carbon fiber cloth composite material of the present invention, comprises the steps:

[0029] 1) Dissolve selenium powder in 5-10 mL of hydrazine hydrate, and then undergo ultrasonic treatment to form 0.04-0.4 mmol mL -1 Solution A; wherein, the power of the ultrasonic generator is 300W, and the ultrasonic time is 1-5h.

[0030] Dissolve sodium molybdate in 20-40mL deionized water to form 0.006-0.03mmol mL -1 solution, and then add 1~5mL with a concentration of 0.04~0.4mmol mL -1 The acetic acid, obtains solution B;

[0031] The hydrophilic carbon cloth is subjected to anodic oxidation pretreatment, then washed and dried to obtain the treated hydrophilic carbon cloth;

[0032] 2) Mix solution A and solution B to form solution C, arrange the anodized hydrophilic carbon in solution C, ultrasonically treat, then perform hydrothermal reaction, then wash and dry to obtain molybdenum diselenide grown carbon fiber cloth...

Embodiment 1

[0036] 1) Dissolve selenium powder in 5mL of hydrazine hydrate, then sonicate for 2h under the condition of ultrasonic generator power of 300W to form 0.2mmol mL -1 Liquid A;

[0037] 2) Sodium molybdate was dissolved in 40 mL deionized water to form 0.03 mmol mL -1 liquid, then add 1mL to a concentration of 0.04mmol mL -1 The acetic acid, obtains solution B;

[0038] 3) The hydrophilic carbon cloth was anodized at 5V and 0.36A for 2 minutes, then washed with acetone, ethanol, and deionized water in sequence, and then dried;

[0039] 4) Mix liquid A and liquid B to form solution C, arrange the anodized hydrophilic carbon in solution C, ultrasonically treat for 2 hours under the condition of ultrasonic generator power of 300W, and then hydrothermally heat at 200°C After reacting for 12 hours, washing with ethanol and deionized water three times respectively, and then vacuum-drying at 60°C for 24 hours to obtain a carbon fiber cloth with molybdenum diselenide grown on it;

...

Embodiment 2

[0045] 1) Dissolve selenium powder in 10mL of hydrazine hydrate, and then sonicate for 1h under the condition of ultrasonic generator power of 200W to form 0.1mmol mL-1 Liquid A;

[0046] 2) Sodium molybdate was dissolved in 30 mL deionized water to form 0.01 mmol mL -1 liquid, then add 2mL concentration of 0.4mmol mL -1 The acetic acid, obtains solution B;

[0047] 3) The hydrophilic carbon cloth was anodized at 4V and 0.3A for 5 minutes, then washed with acetone, ethanol, and deionized water in sequence, and then dried;

[0048] 4) Mix liquid A and liquid B to form solution C, arrange the anodized hydrophilic carbon in solution C, ultrasonicate for 1 h under the condition of ultrasonic generator power of 200W, and then hydrothermally heat at 180°C After reacting for 24 hours, washing with ethanol and deionized water three times respectively, and then vacuum-drying at 60°C for 24 hours to obtain a carbon fiber cloth with molybdenum diselenide grown on it;

[0049] 5) Calci...

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Abstract

The invention provides a preparation method of a flaky molybdenum selenide / carbon fiber sheet composite material. The preparation method of the flaky molybdenum selenide / carbon fiber sheet composite material comprises the steps that selenium powder is dissolved into hydrazine hydrate, and then, a solution A is formed through ultrasonic treatment; sodium molybdate is dissolved into deionized water,and then acetic acid is added to obtain a solution B; anodic oxidation pretreatment is carried out on hydrophilic type carbon cloth, and then washing and drying are carried out to obtain the hydrophilic type carbon cloth after treatment; and the solution A and the solution B are mixed to form a solution C, the hydrophilic type carbon cloth after the treatment is placed in the solution C, ultrasonic treatment is carried out, then, hydrothermal reaction is carried out, and finally burning is carried out under an inert atmosphere. The molybdenum selenide and the hydrophilic type carbon cloth arerecombined, a synergistic effect is used, a stable composite structure is established through carbon fiber sheet formworks, agglomeration of the molybdenum selenide and the hydrophilic type carbon cloth is restrained, the diffusion rate of sodion is improved, more carrier transport channels are provided, the structural stability and the high electrical conductivity of a whole electrode during charging and discharging are maintained, the electrode reaction dynamics process is accelerated, and thus the structural stability and electrical conductivity of cathode materials are improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for preparing a sheet-like molybdenum diselenide / carbon fiber cloth composite material. Background technique [0002] The anode material of the sodium ion battery is an important part of the sodium ion battery, and the composition and structure of the anode material have a decisive influence on the electrochemical performance of the sodium ion battery. For transition metal chalcogenides with a layered structure, on the one hand, they have a high reversible specific capacity, and on the other hand, they have a layered structure, which is conducive to the effective intercalation of sodium ions, resulting in a small initial volume expansion, so it is moderately The modification of transition metal chalcogenides has very good application prospects in the field of electrochemical energy storage. [0003] Molybdenum diselenide with a layered structure has...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/581H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 曹丽云徐培光李嘉胤黄剑锋马定莹党欢郭玲罗晓敏
Owner SHAANXI UNIV OF SCI & TECH
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