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A kind of flexible lithium-ion battery negative electrode and its preparation method and flexible lithium-ion battery

A technology for lithium-ion batteries and negative electrode active materials, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of unsatisfactory fast charging performance of flexible negative electrodes, impossibility of fast charging, poor conductivity of negative electrodes, etc. Achieve the effect of overcoming corrosion, good bendability, and strong bendability

Inactive Publication Date: 2020-08-04
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the design of flexible negative electrodes is mainly to use carbon materials such as carbon nanotubes, carbon fibers, or graphene nanosheets to physically overlap the conductive network film as the current collector, and then load the negative active material to form the negative electrode. However, the contact resistance between these carbon materials The large ratio makes the conductivity of the negative electrode very poor, so the fast charging performance of the flexible negative electrode itself is not ideal, and it is almost impossible to achieve fast charging after being assembled into a battery

Method used

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  • A kind of flexible lithium-ion battery negative electrode and its preparation method and flexible lithium-ion battery
  • A kind of flexible lithium-ion battery negative electrode and its preparation method and flexible lithium-ion battery
  • A kind of flexible lithium-ion battery negative electrode and its preparation method and flexible lithium-ion battery

Examples

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Effect test

Embodiment 1

[0038] A method for preparing a flexible lithium-ion battery negative electrode, comprising the following steps:

[0039] (1) Preparation of black phosphorus nanoparticles

[0040] Add black phosphorus powder and cetyltrimethylammonium bromide to the organic solvent obtained by combining polylactic acid (PLA) and dimethylformamide in a mass ratio of 1:5 and mix evenly. Ultrasonic treatment in a water bath for 7 hours, vacuum filtration, and vacuum drying to obtain a few-layer black phosphorus flake material, that is, black phosphorus nanoparticles;

[0041] (2) Preparation of porous polymer nanofibrous web

[0042] Weigh 1.5g of polyacrylonitrile with a molecular weight of 100,000 and add it to 12g of N,N-dimethylformamide, heat to 55°C and stir magnetically for 10 hours to obtain an electrospinning solution; use the electrospinning solution as a raw material , under the conditions of spinning voltage of 17kV, spinning distance of 16cm, and spinning time of 2.5 hours, electr...

Embodiment 2

[0049] A method for preparing a flexible lithium-ion battery negative electrode, comprising the following steps:

[0050] (1) Preparation of black phosphorus nanoparticles

[0051] Black phosphorus powder and intercalation agent hexadecyltrimethylammonium bromide are added to polycaprolactone (PCL) and dimethylformamide (volume ratio is 1:1) in an organic Mix evenly in the solvent, isolate the air, and ultrasonically treat in a water bath at 65°C for 7 hours, then vacuum filter and vacuum dry to obtain a few-layer black phosphorus flake material, that is, black phosphorus nanoparticles;

[0052] (2) Preparation of porous polymer nanofibrous web

[0053] With embodiment 1;

[0054] (3) Preparation of flexible lithium-ion battery negative electrode

[0055] With embodiment 1.

[0056] Fabrication of Flexible Lithium-ion Coin Cells

[0057] The flexible lithium-ion battery negative electrode prepared in Example 2 of the present invention is used as the negative electrode, th...

Embodiment 3

[0059] A method for preparing a flexible lithium-ion battery negative electrode, comprising the following steps:

[0060] (1) Preparation of black phosphorus nanoparticles

[0061] With embodiment 2;

[0062] (2) Preparation of porous polymer nanofibrous web

[0063] Weigh 1.5g of polyacrylonitrile with a molecular weight of 100,000 and add it to 12g of N,N-dimethylformamide, heat to 55°C and stir magnetically for 10 hours to obtain an electrospinning solution; use the electrospinning solution as a raw material , under the conditions of spinning voltage of 17kV, spinning distance of 16cm, and spinning time of 2.5 hours, electrospinning is completed to obtain polymer nanofiber web; the obtained polymer nanofibrous web is placed in a tube furnace , raising the furnace temperature from room temperature to 300°C at a heating rate of 1.0°C / min, and calcining at a calcination temperature of 300°C for 40 minutes to complete pre-oxidation to obtain a porous polymer nanofibrous web; ...

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Abstract

The invention provides a flexible lithium ion battery negative electrode. The flexible lithium ion battery negative electrode comprises a porous carbon nanofiber thin film and a negative electrode active material and black phosphorus nanoparticles supported by the porous carbon nanofiber thin film, wherein the porous carbon nanofiber thin film is formed by multiple porous carbon nanofibers. The flexible lithium ion battery negative electrode is high in conductivity, high in capacity, light in weight and high in bending property, and can improve specific capacity, cycling performance, rate capability and quick charging property of a lithium ion battery. The invention also provides a preparation method for the flexible lithium ion battery negative electrode and a flexible lithium ion battery comprising the flexible lithium ion battery negative electrode.

Description

technical field [0001] The invention relates to the technical field of flexible lithium-ion batteries, in particular to a flexible lithium-ion battery negative electrode, a preparation method thereof, and a flexible lithium-ion battery. Background technique [0002] With the development of science and the advancement of technology, people have higher and higher requirements for the performance of electronic devices. In recent years, research on flexible / foldable electronic devices has attracted much attention, and portable mobile electronic products are also developing in the direction of "bendable". Foldable or bendable portable electronic products, such as laptops, tablets, and mobile phones, will soon become the mainstream of next-generation electronic products, and will greatly affect and change our way of life. However, the application of flexible electronic products must be used in conjunction with flexible batteries. Therefore, how to combine the idea of ​​flexible c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/62H01M4/66H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/131H01M4/1391H01M4/624H01M4/628H01M4/663H01M10/0525Y02E60/10
Inventor 张晗王任衡张家宜
Owner SHENZHEN UNIV
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