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Flexible electrode material as well as preparation method and application thereof

A flexible electrode, polyacrylonitrile fiber technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as inconvenience in use, and achieve the effects of good stability, excellent cycle performance, and excellent cycle performance.

Active Publication Date: 2017-10-20
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flexible electrode materials in the prior art need to add binder and carbon black during use, which is inconvenient to use

Method used

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  • Flexible electrode material as well as preparation method and application thereof
  • Flexible electrode material as well as preparation method and application thereof
  • Flexible electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0073] The invention provides a method for preparing a flexible electrode material, comprising the following steps:

[0074] Dissolving polyacrylonitrile fibers and manganese sulfate in a spinning solvent and then heat-treating to obtain a spinning solution; the spinning solvent is N,N-dimethylformamide and / or N,N-dimethylethane amides;

[0075] Spinning the spinning solution to obtain raw fibers;

[0076] performing pre-oxidation treatment on the raw fibers to obtain pre-oxidized fibers;

[0077] Under an inert atmosphere, the pre-oxidized fiber is carbonized to obtain a flexible electrode material.

[0078] In the invention, the polyacrylonitrile fiber and manganese sulfate are dissolved in a spinning solvent and then heated to obtain a spinning solution. The present invention has no special requirements on the mixing order of the polyacrylonitrile fiber, manganese sulfate and spinning solvent, and the three can be mixed in any order.

[0079] In the present invention, t...

Embodiment 1

[0094] Put the polyacrylonitrile fibers into N,N-dimethylformamide so that the concentration is 0.07g / mL, add manganese sulfate monohydrate with a mass of 10% relative to the polyacrylonitrile fibers in the spinning solution, and bathe in 80°C water, Stir for 12 hours to obtain a spinning solution.

[0095] The spinning solution is injected into a plastic syringe, and a stainless steel No. 7 needle is connected underneath. A receiving steel plate was placed at a vertical distance of 20 cm below the needle, a DC voltage of 15 KV was applied between the needle and the receiving plate, and the spinning flow rate was 0.3 mL / h.

[0096] The raw fibers obtained by spinning were placed in a muffle furnace at 280° C. for 5 hours. The pre-oxidized material was placed in a tube furnace at 700°C, kept under nitrogen protection for 2 hours for carbonization, and a flexible electrode material in the form of a paper sheet was obtained.

[0097] Cut the carbonized fiber cloth into small pi...

Embodiment 2

[0101] The scheme of embodiment 2 is the same as that of embodiment 1, the only difference is that 20% manganese sulfate monohydrate with respect to the mass of polyacrylonitrile fiber is added.

[0102] The present invention has carried out charge-discharge cycle test to the obtained lithium ion half battery, and its result is as follows: Figures 18-23 . in, Figure 18 It is the first circle CV diagram of the lithium-ion half-cell obtained in Example 2 of the present invention; Figure 19 It is the second circle CV diagram of the lithium-ion half-cell obtained in Example 2 of the present invention; Figure 20 It is the third circle CV diagram of the lithium-ion half-cell obtained in Example 2 of the present invention; Figure 21 It is the fourth circle CV diagram of the lithium-ion half-cell obtained in Example 2 of the present invention; Figure 22 It is the fifth circle CV diagram of the lithium-ion half-cell obtained in Example 2 of the present invention; Figure 23 ...

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Abstract

The invention provides a preparation method of a flexible electrode material. The preparation method of the flexible electrode material, provided by the invention, can be realized only through steps of mixing liquid, spinning, pre-oxidizing and carbonizing, and is convenient and rapid. The invention further provides the flexible electrode material; the flexible electrode material can be independently used for preparing a lithium-ion battery and a sodium-ion battery, and does not need to be combined with any adhesive and carbon black to use. Moreover, the flexible electrode material provided by the invention also has an excellent circulating performance. According to records of the embodiment, after the flexible electrode material provided by the invention is used for preparing the lithium-ion battery and the sodium-ion battery, the batteries have an excellent charging / discharging circulating performance and good stability; wherein, after the lithium-ion battery is circulated for 100 circles, the capacity still can keep at 450mAh / g or more; after the sodium-ion battery is circulated for 100 circles, the capacity still can keep at 200mAh / g or more.

Description

technical field [0001] The invention relates to the technical field of flexible electrodes, in particular to a flexible electrode material and its preparation method and application. Background technique [0002] In the past few decades, Li-ion batteries and Na-ion batteries have attracted extensive attention as an important electrochemical energy storage device. Lithium-ion has the following advantages: lithium-ion battery has high energy density, high average output voltage, small self-discharge, and no memory effect; the working temperature range is -20 ° C to 60 ° C, excellent cycle performance, fast charging and discharging, and charging efficiency up to 100%. ; High output power and long service life. [0003] The working principle of sodium-ion batteries is similar to that of lithium-ion batteries, using the intercalation process of sodium ions between the positive and negative electrodes to achieve charge and discharge. Compared with lithium-ion batteries, sodium-i...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/13H01M10/0525H01M10/054D01F1/10D01F6/54
CPCD01F1/10D01F6/54H01M4/13H01M4/139H01M10/0525H01M10/054Y02E60/10
Inventor 高宇高爽魏英进陈岗
Owner JILIN UNIV
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