Carbonized silk fabric/transition metal oxide composite material for flexible lithium ion battery negative electrode and preparation method thereof

A lithium-ion battery, transition metal technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of poor conductivity, slow diffusion of lithium ions, unstable structure, etc., and achieve simple preparation and good electrochemical performance. Effects of performance and mechanical flexibility, good electrical conductivity

Active Publication Date: 2019-05-03
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, transition metal oxides have disadvantages such as poor conductivity, slow diffusion of lithium ions, and unstable structure as negative electrodes for lithium-ion batteries.

Method used

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  • Carbonized silk fabric/transition metal oxide composite material for flexible lithium ion battery negative electrode and preparation method thereof
  • Carbonized silk fabric/transition metal oxide composite material for flexible lithium ion battery negative electrode and preparation method thereof
  • Carbonized silk fabric/transition metal oxide composite material for flexible lithium ion battery negative electrode and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing a carbonized silk fabric / transition metal oxide composite material for a negative electrode of a flexible lithium-ion battery, the specific steps of the method are as follows:

[0039](1) Preparation of carbonized silk fabric: Cut a piece of 3cm×4cm electric spinning silk fabric, place it in a tube furnace, and carbonize it in an argon atmosphere at 600°C for 3h, with a heating rate of 2°C / min and an argon flow rate of 40sccm, promptly obtains required carbonized silk fabric. The topography of carbonized silk fabric is shown in figure 1 .

[0040] (2) Carbonized silk fabric pretreatment: put the carbonized silk fabric obtained in (1) in 6M HCl solution, acid treatment at 100°C for 2 hours, after natural cooling, take out the carbonized silk fabric, wash with deionized water and absolute ethanol Washing was repeated 3 times in medium temperature and dried at 80°C for 12 hours to obtain pretreated carbonized silk fabric.

[0041] (3) Preparation ...

Embodiment 2

[0044] A method for preparing a carbonized silk fabric / transition metal oxide composite material for a negative electrode of a flexible lithium-ion battery, the specific steps of the method are as follows:

[0045] (1) Preparation of carbonized silk fabric: cut a 3cm×4cm crepe de chine silk fabric, place it in a tube furnace, and carbonize it in a neon gas atmosphere at 700°C for 4 hours, with a heating rate of 5°C / min and a neon gas flow rate of 40sccm, promptly obtains required carbonized silk fabric.

[0046] (2) Carbonized silk fabric pretreatment: put the carbonized silk fabric obtained in (1) in 4M HCl solution, acid treatment at 120°C for 4 hours, after natural cooling, take out the carbonized silk fabric, wash with deionized water and absolute ethanol Washing was repeated 3 times in medium temperature and dried at 80°C for 12 hours to obtain pretreated carbonized silk fabric.

[0047] (3) Preparation of carbonized silk fabric / transition metal oxide precursor: First, a...

Embodiment 3

[0050] A method for preparing a carbonized silk fabric / transition metal oxide composite material for a negative electrode of a flexible lithium-ion battery, the specific steps of the method are as follows:

[0051] (1) Preparation of carbonized silk fabric: Cut a piece of georgette silk fabric of 3cm×4cm, place it in a tube furnace, and carbonize it in a nitrogen atmosphere at 800°C for 4h, with a heating rate of 6°C / min and a nitrogen flow rate of 80sccm, namely Obtain the desired carbonized silk fabric.

[0052] (2) Carbonized silk fabric pretreatment: place the carbonized silk fabric obtained in (1) in 5M HNO 3 In the solution, acid treatment was carried out at 110°C for 2 hours. After natural cooling, the carbonized silk fabric was taken out, washed three times with deionized water and absolute ethanol, and dried at 80°C for 12 hours to obtain a pretreated carbonized silk fabric.

[0053] (3) Preparation of carbonized silk fabric / transition metal oxide precursor: First, a...

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Abstract

The invention relates to a carbonized silk fabric/transition metal oxide composite material for a flexible lithium ion battery negative electrode and a preparation method thereof, and belongs to the technical field of energy storage system device material preparation. The method comprises obtaining a carbonized silk fabric by carbonizing a silk fabric, and obtaining the carbonized silk fabric/transition metal oxide composite material by acid pretreatment, hydrothermal or solvothermal growth, and subsequent annealing. The carbonized silk fabric has high electrical conductivity, and the transition metal oxide is uniformly distributed on the carbonized silk fabric by the shapes of a nanowire, a nanosheet and a nanoblock. The obtained carbonized silk fabric/transition metal oxide, when used asa lithium ion battery negative electrode, has good electrochemical performance and mechanical flexibility.

Description

technical field [0001] The invention relates to an energy storage system device material, in particular to a carbonized silk fabric / transition metal oxide composite material used for a negative electrode of a flexible lithium ion battery and a preparation method thereof, belonging to the technical field of energy storage system device material preparation. Background technique [0002] Due to the rapid economic development and the continuous improvement of people's living standards, the demand for portable electronic devices and wearable electronic products is increasing, such as: smart bracelets, bendable screens, etc. The continuous emergence of these flexible electronic products requires corresponding flexible energy storage devices to match them. As a secondary battery, lithium-ion batteries have the advantages of high energy density, high power density, no memory effect, and environmental friendliness compared with traditional lead-acid batteries and nickel-metal hydrid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 胡毅潘鹏陈仁忠沈桢
Owner ZHEJIANG SCI-TECH UNIV
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