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Self-supporting phosphorus/carbon three-dimensional conductive network composite electrode material and preparation method and application thereof

A conductive network and composite electrode technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of poor cycle stability, poor rate performance, poor conductivity of phosphorus-based materials, etc., and achieve high reversible charge-discharge specific capacity, excellent conductivity, high Effect of specific capacity and cycle stability

Pending Publication Date: 2021-09-07
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material and its preparation method and application to solve the problems of poor conductivity, poor cycle stability, and poor rate performance of existing phosphorus-based materials.

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  • Self-supporting phosphorus/carbon three-dimensional conductive network composite electrode material and preparation method and application thereof
  • Self-supporting phosphorus/carbon three-dimensional conductive network composite electrode material and preparation method and application thereof
  • Self-supporting phosphorus/carbon three-dimensional conductive network composite electrode material and preparation method and application thereof

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preparation example Construction

[0039] The embodiment of the present invention provides a preparation method of a self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material, including steps:

[0040] S1. Soak bacterial cellulose membrane in ammonium dihydrogen phosphate aqueous solution, freeze and dry the soaked bacterial cellulose membrane; ammonium dihydrogen phosphate inorganic salt can produce more pores and reduce bacteria in the subsequent high-temperature sintering process Volume change of the cellulose membrane;

[0041] S2, sintering the freeze-dried bacterial cellulose film under an inert atmosphere;

[0042] S3, mixing the sintered bacterial cellulose membrane with red phosphorus, and vacuum sintering to obtain a phosphorus-carbon composite material;

[0043] S4. Washing the phosphorus-carbon composite material with carbon disulfide, washing away the by-product white phosphorus produced during the evaporation and condensation of red phosphorus, and drying...

Embodiment 1

[0059] The present embodiment provides the preparation method of self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material, and concrete steps are as follows:

[0060] 1) Soak an appropriate amount of commercial bacterial cellulose membrane in 50mmol / L ammonium dihydrogen phosphate aqueous solution, and stir slowly for 3 days in a water bath at 25°C; cut the soaked bacterial cellulose membrane into a size of about 5cm×5cm Size, frozen in a liquid nitrogen (-196°C) environment; then transfer the sample to a bulk tray dryer for freeze-drying at a sublimation temperature of -50°C and a pressure of 0.035mbar;

[0061] 2) Using a tube furnace, the freeze-dried bacterial cellulose membrane was heated in a nitrogen atmosphere at 2°C min -1 The heating rate is increased to 400°C, kept for 1 hour, and then at 5°C min -1 The heating rate is increased to 800 ° C, and the temperature is kept for 2 hours;

[0062] 3) Mix the sintered bacterial ce...

Embodiment 2

[0073] This embodiment provides the preparation method of self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material, and the difference with embodiment 1 is:

[0074] In step 3), the sintered bacterial cellulose film is mixed with the ground red phosphorus in a weight ratio of 1:2;

[0075] Other steps and parameters are all the same as in Example 1.

[0076] The self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material prepared in this embodiment 2, at 100mA g -1 Under the current density, the first discharge specific capacity can reach 759mAh / g, the charge specific capacity is 504mAh / g, the discharge specific capacity after 250 cycles is 126mAh / g, and the capacity retention rate is 25%. After analysis, it can be speculated that the increase in the relative content of red phosphorus leads to more red phosphorus loaded on the outside of the three-dimensional carbon fiber, rather than confined ...

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Abstract

The invention provides a self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material and a preparation method and application thereof. The preparation method comprises the steps of soaking a bacterial cellulose membrane in an ammonium dihydrogen phosphate aqueous solution, and freezing and drying the soaked bacterial cellulose membrane; sintering the freeze-dried bacterial cellulose membrane in an inert atmosphere; mixing the sintered bacterial cellulose membrane with red phosphorus, and performing vacuum sintering to obtain a phosphorus-carbon composite material; and washing the phosphorus-carbon composite material with carbon disulfide, and carrying out vacuum drying to obtain the self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material. The self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material is obtained through freeze drying and evaporative condensation methods, the preparation process is easy to operate, the raw materials are cheap and easy to obtain, and the obtained self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material has excellent conductivity, cycling stability and rate capability.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and electrochemistry, in particular to a self-supporting phosphorus / carbon three-dimensional conductive network composite electrode material and its preparation method and application. Background technique [0002] Potassium has abundant reserves and a wide range of sources, and has similar physical and chemical properties to lithium and sodium. Potassium-ion batteries have attracted the attention of many researchers in recent years. The volume change is significant during the potassium intercalation process, and the electrochemical reaction is sluggish, resulting in unfavorable rate performance and rapid capacity fading. Therefore, designing electrode materials, especially anode materials, designing fast ion reaction kinetics, high structural stability, and optimizing electrochemical performance are the key requirements for realizing energy storage in high-performance potassium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M10/054
CPCH01M4/38H01M4/625H01M10/054H01M2004/027Y02E60/10
Inventor 罗雯封文聪麦立强陈伟
Owner WUHAN UNIV OF TECH
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