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Flexible ferrous phosphide/carbon nanofiber membrane, and preparation method and application thereof

A technology of carbon nanofibers and iron phosphide, applied in the fields of fiber chemical characteristics, rayon manufacturing, electrochemical generators, etc., can solve problems such as shedding, unstable electrode capacity effects, etc., to enhance electrical conductivity and maintain structural integrity , the effect of simple production method

Active Publication Date: 2020-05-22
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More importantly, these powdery materials are easy to fall off from the carrier during battery use, resulting in unstable electrode capacity effects

Method used

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  • Flexible ferrous phosphide/carbon nanofiber membrane, and preparation method and application thereof
  • Flexible ferrous phosphide/carbon nanofiber membrane, and preparation method and application thereof
  • Flexible ferrous phosphide/carbon nanofiber membrane, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Preparation of iron phytate nanoparticles. The preparation of ferric phytate nanoparticles includes two steps of synthesis and purification.

[0037] Dissolve 1.0 g of phytic acid in 10 mL of water, adjust the pH to 6 with concentrated ammonia water as solution A. Weigh 0.944g FeCl 3, 1 g of urea and 0.2 g of surfactant cetyltrimethylammonium bromide (CTAB) were dissolved in 5 mL of deionized water as solution B. Slowly add solution B to solution A drop by drop, resulting in white precipitates, which are centrifuged with deionized water and collected. White Fe-based precursor powder (iron phytate) obtained after drying. like figure 1 As shown, the size of iron phytate nanoparticles is about 200-500nm.

Embodiment 2

[0039] Preparation of iron phytate nanoparticles. The preparation of ferric phytate nanoparticles includes two steps of synthesis and purification.

[0040] Dissolve 10.0 g of phytic acid in 10 mL of water, adjust the pH to 5 with concentrated ammonia water as A solution. Weigh 1g FeCl 3 , 1 g of ammonia water and 0.2 g of surfactant polyvinylpyrrolidone were dissolved in 5 mL of deionized water as solution B. Slowly add solution B to solution A drop by drop, resulting in white precipitates, which are centrifuged with deionized water and collected. White Fe-based precursor powder (iron phytate) obtained after drying. like figure 2 As shown in a, the size of iron phytate nanoparticles is about 500-1000 nm.

Embodiment 3

[0042] Preparation of iron phytate nanoparticles. The preparation of ferric phytate nanoparticles includes two steps of synthesis and purification.

[0043] Dissolve 5.0 g of phytic acid in 10 mL of water, adjust the pH to 4 with concentrated ammonia water as solution A. Weigh 1g FeCl 3 , 1 g of urea and 0.2 g of surfactant sodium dodecylbenzene sulfonate were dissolved in 5 mL of deionized water as solution B. Slowly add solution B to solution A drop by drop, resulting in white precipitates, which are centrifuged with deionized water and collected. White Fe-based precursor powder (iron phytate) obtained after drying. like figure 2 As shown in b, the size of iron phytate nanoparticles is about 500-1000nm.

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Abstract

The invention discloses a flexible ferrous phosphide / carbon nanofiber membrane, and a preparation method and application thereof. The preparation method comprises the following steps of (1) preparingferric phytate nanoparticles by using phytic acid and ferric chlorides as raw materials; (2) dispersing the ferric phytate nanoparticles prepared in the step (1) into an organic solvent; then, addingpolyacrylonitrile to prepare a spinning solution; and performing electrostatic spinning to prepare a ferric phytate / PAN nanofiber membrane; and (3) pre-oxidizing the ferric phytate / PAN nanofiber membrane prepared in the step (2), and performing carbonization treatment in an inert atmosphere to prepare the flexible ferrous phosphide / carbon nanofiber membrane. The preparation method provided by theinvention is simple, convenient, green and safe, and can realize large-area continuous production. Through a phosphorus doped carbon material in a prepared flexible electrode material, the electricalconductivity is improved, and the volume change of FeP in the charging-discharging process is reduced; through a carbon layer on the FeP, the formation of a stable SEI membrane is improved; and the structure integrity is maintained.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a flexible iron phosphide / carbon nanofiber membrane and its preparation method and application. Background technique [0002] Against the backdrop of increasing energy shortage and environmental pollution issues, there is an urgent need to develop high-power-density electrochemical storage systems to meet the rapidly growing demands of electric vehicles (EVs), large-scale energy storage systems (ESSs), and portable electronic devices . Lithium-ion batteries (LIBs) have been the subject of long-term research due to their long cycle life, high operating voltage, high energy density, high rate capability, and environmental friendliness. In lithium batteries, anode materials play a vital role. Historically speaking, the safety problem of lithium batteries has been solved precisely because of the emergence of carbon negative electrodes, which has given lithium batterie...

Claims

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Application Information

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IPC IPC(8): D04H1/43D06C7/04D01F1/10D01F6/54H01M4/36H01M4/58H01M4/62H01M10/0525
CPCD01F1/10D01F6/54D04H1/43D06C7/04H01M4/366H01M4/5805H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 戴文琪刘海清翟云云桑笑孙良钰李悦李思宇
Owner JIAXING UNIV
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