Preparation method of one-dimensional coaxial flexible composite electrode material

A composite electrode and coaxial technology, applied in the field of materials, can solve the problems of structural instability of flexible materials, low loading of electrode active materials, poor electrochemical performance, etc., achieve good mechanical stability, improve electrical conductivity, and have self- supporting effect

Inactive Publication Date: 2018-04-03
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems of complex process, unstable flexible material structure, low electrode active material loading and poor electrochemical perf

Method used

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  • Preparation method of one-dimensional coaxial flexible composite electrode material
  • Preparation method of one-dimensional coaxial flexible composite electrode material
  • Preparation method of one-dimensional coaxial flexible composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 1g of polyacrylonitrile and dissolve it in 8g of N,N-dimethylformamide, stir at room temperature to obtain a uniform and transparent solution;

[0028] (2) Add 0.11g of one-dimensional manganese dioxide nanorods to the transparent solution obtained in step (1), and stir magnetically at 400r / min for 36h to obtain a uniformly dispersed spinning solution; wherein, the used one-dimensional manganese dioxide nanorods Dissolve 0.4g of potassium permanganate and 1g of concentrated hydrochloric acid purchased from Beijing Tongguang Fine Chemical Co., Ltd. in 45ml of deionized water, then transfer the obtained solution to a 50ml polytetrafluoroethylene reactor, and the reactor Put it in an oven at 140° C. for hydrothermal reaction for 5 hours, and cool down to room temperature naturally. The obtained tan powder was washed with deionized water to neutrality and then dried at 80°C to obtain one-dimensional manganese dioxide nanorods.

[0029] (3) the uniformly dispersed...

Embodiment 2

[0032] (1) Weigh 1g of polyacrylonitrile and dissolve it in 10g of N,N-dimethylformamide, stir at room temperature to obtain a uniform and transparent solution;

[0033] (2) Add 0.43g of one-dimensional manganese dioxide nanorods to the transparent solution obtained in step (1), and stir magnetically at 500r / min for 20h to obtain a uniformly dispersed spinning solution; wherein the preparation method and embodiment of one-dimensional manganese dioxide 1 is the same.

[0034] (3) the uniformly dispersed spinning solution that step (2) obtains is 0.8mm in needle inner diameter, and the distance of injection needle and receiving roller is 20cm, and the static voltage applied between receiving roller and needle is 20kV, and injection rate is 0.8ml / h, the temperature is 30 ° C, and the humidity is 25% under the condition of spinning for 6 hours to prepare the coaxial composite fiber precursor;

[0035] (4) The obtained nanofiber precursor was heated in air at a rate of 5° C. / min,...

Embodiment 3

[0037] (1) Weigh 1g of polyacrylonitrile and dissolve it in 12g of N,N-dimethylformamide, stir at room temperature to obtain a uniform and transparent solution;

[0038] (2) 1.5g one-dimensional manganese dioxide nanorods are added to the transparent solution obtained in step (1), and 800r / min magnetic stirring is carried out for 36h to obtain a uniformly dispersed spinning solution; wherein the preparation method of one-dimensional manganese dioxide nanorods is the same as Example 1 is the same.

[0039] (3) the uniformly dispersed spinning solution that step (2) obtains is 0.8mm in needle internal diameter, and the distance of injection needle and receiving roller is 15cm, and the static voltage applied between receiving roller and needle is 25kV, and injection rate is 0.5ml / h, the temperature is 25 ° C, and the humidity is 20% under the condition of spinning for 12 hours to prepare the coaxial composite fiber precursor;

[0040] (4) The obtained nanofiber precursor was he...

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Abstract

The invention relates to preparation method of a one-dimensional coaxial flexible composite electrode material for a lithium ion battery. A one-dimensional coaxial composite thin film is prepared by adding a one-dimensional active substance raw material into a polyacrylonitrile spinning solution, employing electrostatic spinning and performing pre-oxidization in air and carbonization in nitrogen atmosphere. The one-dimensional coaxial composite material prepared by the method can be directly used as a negative electrode material of the lithium ion battery, no extra current collector, conductive additive or binding agent are needed, and the one-dimensional coaxial flexible composite electrode material has certain flexibility; the material has the characteristics of simple preparation process, good structural stability, automatic current collection, favorable electrochemical performance and the like; and the method can be used for the field of preparation of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing a one-dimensional coaxial flexible composite electrode material. Background technique [0002] The development of science and technology makes people have higher and higher requirements on the performance of products. Flexible electronic products have become a research mainstream, and flexible electronic products need flexible lithium batteries to provide energy. It is difficult for traditional lithium-ion batteries to meet the requirements of flexibility, and it is necessary to add binders, conductive additives and rely on current collectors to obtain a good electrochemical performance during the preparation process. The process is complicated, the loading of electrode active materials is low, Poor electrochemical performance, self-supporting flexible electrode materials can significantly improve the above problems. [0003] Certain lithium-ion battery anode mate...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/625H01M10/0525Y02E60/10
Inventor 于运花郭艳艳郑丽明杨小平
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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