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Two-dimensional structure selenium telluride modified carbon fiber electrode material and preparation method thereof

A carbon fiber electrode and two-dimensional structure technology, applied in structural parts, battery electrodes, secondary batteries, etc., can solve the problems of energy density discount, unfavorable practical application of transition metal selenium, etc., achieve high stability and energy density, and improve utilization The effect of high efficiency, stability, and small volume change

Pending Publication Date: 2021-06-11
GUIZHOU MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, selenium (tellurium) compounds usually have unavoidable volume changes and side reactions during the conversion reaction. Researchers often need to shorten the voltage window to 0.5-3.0 V to obtain better electrochemical stability, but This will greatly sacrifice the low-voltage capacity of the negative electrode of the battery, and when applied to a full battery, the energy density will be greatly reduced, which is not conducive to the practical application of transition metal selenium (tellurium) compound nanomaterials.

Method used

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  • Two-dimensional structure selenium telluride modified carbon fiber electrode material and preparation method thereof
  • Two-dimensional structure selenium telluride modified carbon fiber electrode material and preparation method thereof
  • Two-dimensional structure selenium telluride modified carbon fiber electrode material and preparation method thereof

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Embodiment 1

[0019] Embodiment 1: In this embodiment, a kind of MoSe is provided 2 / carbon nanofiber self-supporting material preparation method, the specific preparation method is as follows:

[0020] (1) Add 500 mg MoS 2 After the powder was fully mixed with 50 mL N,N-dimethylformamide, 0.25 mg / ml MoS was obtained after 6 hours of ultrasonic intercalation, centrifugation and washing for 3 times. 2 Dispersions.

[0021] (2) 8ml MoS 2 The dispersion liquid and 1 g of polyacrylonitrile powder were fully dissolved in N,N-dimethylformamide to prepare a spinning solution.

[0022](3) Electrospinning the spinning solution obtained in step (2) to obtain polyacrylonitrile 2D MoS 2 / PAN composite nanofiber membrane, the operating parameters of electrospinning are: voltage 12 KV, receiving distance 12 cm, flow rate 1 mL / h.

[0023] (4) For step (3) to get 2D MoS 2 / PAN composite nanofiber membrane placed in a tube furnace for pre-stabilization and carbonization to obtain 2D MoS 2 / CNF membr...

Embodiment 2

[0025] Embodiment 2: In this embodiment, a kind of WTe is provided 2 / carbon nanofiber self-supporting material preparation method, the specific preparation method is as follows:

[0026] (1) Add 200 mg WS 2 After the powder was fully mixed with 30 mL N,N-dimethylformamide, after 10 h ultrasonic intercalation stripping, centrifugation and washing three times, 0.2 mg / ml WS was obtained. 2 Dispersions.

[0027] (2) 25ml WS 2 The dispersion liquid and 2 g of polyacrylonitrile powder were fully dissolved in N,N-dimethylformamide to prepare a spinning solution.

[0028] (3) Electrospinning the spinning solution obtained in step (2) to obtain polyacrylonitrile 2D WS 2 / PAN composite nanofiber membrane, the electrospinning operating parameters are: voltage 15 KV, receiving distance 10 cm, flow rate 2 mL / h.

[0029] (4) For step (3) to get 2D WS 2 / PAN composite nanofiber membranes were pre-stabilized and carbonized in a tube furnace to obtain 2D WS 2 / CNF membrane, the pretre...

Embodiment 4

[0031] Embodiment 4: In this embodiment, a preparation method of WSe / carbon nanofiber self-supporting material is provided, and the specific preparation method is as follows:

[0032] (1) Mix 100 mg WS 2 After the powder was fully mixed with 30 mL N,N-dimethylformamide, after 4 hours of ultrasonic intercalation stripping, centrifugation and washing for 3 times, 0.25 mg / ml WS was obtained. 2 Dispersions.

[0033] (2) Fully dissolve 1 gram of polyacrylonitrile powder in N,N-dimethylformamide to prepare a spinning solution with a concentration of 10%.

[0034] (3) The spinning solution obtained in step (2) was subjected to electrospinning technology to obtain polyacrylonitrile nanofiber membrane. The operating parameters of electrospinning were: voltage 15 KV, receiving distance 10 cm, and flow rate 1 mL / h.

[0035] (4) Place the PAN film obtained in step (2) on the 2D WS obtained in (1) 2 Ultrasonic immersion in the dispersion for 30 min, placed in a freeze dryer for freeze-d...

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Abstract

The invention discloses a preparation method of a two-dimensional structure selenium telluride modified carbon fiber electrode material, and the method is characterized in that the method comprises the following steps: obtaining a solution-dispersed two-dimensional layered nano material tungsten disulfide or molybdenum disulfide by adopting an intercalation exfoliation method; obtaining a polyacrylonitrile / tungsten disulfide or molybdenum disulfide composite nanofiber precursor by adopting an electrostatic spinning technology, and carrying out pre-stabilization and carbonization processes to obtain a two-dimensional lamellar structure tungsten or molybdenum nanosheet modified carbon nanofiber membrane; and finally, preparing the two-dimensional structure selenium telluride modified carbon fiber electrode material with the micropore confinement function through selenium or telluride replacement.

Description

technical field [0001] The present invention relates to the field of lithium-ion batteries and supercapacitors, in particular to two-dimensional lamellar structure tungsten (molybdenum)-based carbon fiber electrode materials selenium (tellurium) substitution to improve carbon fiber capacitance, electronic effect electrode materials and their preparation methods and applications, In particular, a two-dimensional structure selenium (telluride) tungsten (molybdenum) modified carbon fiber electrode material for energy storage and flexible energy storage to improve its energy density. Background technique [0002] Due to the advantages of high power density and fast charging and discharging, supercapacitors are considered to be one of the ideal choices to replace traditional energy storage systems and alleviate energy and environmental problems. The development of bifunctional electrode materials with high energy density and high electrochemical stability has become a top priorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525H01M4/86H01M4/90H01M4/96H01G11/24H01G11/30H01G11/36B82Y40/00
CPCH01M4/362H01M4/581H01M4/583H01M10/0525H01M4/8647H01M4/90H01M4/96H01G11/24H01G11/30H01G11/36B82Y40/00Y02E60/10Y02E60/50
Inventor 王超楠王波罗胜耘杨吟野张朝珍
Owner GUIZHOU MINZU UNIV
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