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Preparation method of silicon carbon fiber film and application of silicon carbon fiber film as lithium ion battery negative electrode material

A technology of fiber film and silicon carbon fiber, which is applied in battery electrodes, battery pack components, circuits, etc., can solve the problems of material structure damage and hinder the practical application of silicon negative electrodes, and achieve buffer volume expansion, excellent cycle stability, and stable performance Effect

Pending Publication Date: 2022-04-26
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Silicon is an attractive anode material with a large theoretical specific capacity, however, the material undergoes severe structural damage due to large volume changes during charge-discharge cycles, hindering the practical application of silicon anodes.

Method used

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  • Preparation method of silicon carbon fiber film and application of silicon carbon fiber film as lithium ion battery negative electrode material
  • Preparation method of silicon carbon fiber film and application of silicon carbon fiber film as lithium ion battery negative electrode material
  • Preparation method of silicon carbon fiber film and application of silicon carbon fiber film as lithium ion battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0033] This embodiment prepares the silicon carbon fiber film according to the following steps:

[0034] Step 1, preparing spinning solution.

[0035] Add 0.9g polyacrylonitrile to 3mL DMF and heat and stir at 80°C until dissolved to obtain a polyacrylonitrile solution; add 0.9g F127 to 3mL DMF and heat and stir at 80°C to obtain a F127 solution; Add the powder into 4mL DMF, ultrasonically disperse for 15 minutes and then stir for 30 minutes to obtain a nano-silica powder solution; mix the polyacrylonitrile solution, F127 solution and nano-silica powder solution, and continue heating and stirring at 80°C for 3 hours to obtain a spinning solution.

[0036] Step 2. Electrospinning

[0037] Put the spinning solution obtained in step 1 in a syringe, and carry out electrospinning at room temperature, and the fiber film is collected on the nickel foam; the collected fiber film is vacuum-dried at 80°C for 18 hours; the parameters of the electrospinning are: voltage 15KV, The humidi...

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Abstract

The invention discloses a preparation method of a silicon carbon fiber film and application of the silicon carbon fiber film as a negative electrode material of a lithium ion battery. The fiber film is obtained by performing electrostatic spinning on a spinning solution containing polyacrylonitrile, F127 and nano silicon powder and then performing carbonization. The preparation method disclosed by the invention is simple, the used raw materials are cheap and easy to obtain, and the obtained product has excellent cycling stability and high specific capacity when being applied to a lithium ion battery negative electrode.

Description

technical field [0001] The invention relates to a preparation method of a silicon carbon fiber film and its application as a negative electrode material of a lithium ion battery, belonging to the field of electrochemical energy storage of nanometer materials. Background technique [0002] Energy is a central element of modern society. The progress and development of society are inseparable from the demand for energy. With the increasing exploitation and consumption of non-renewable energy, the accompanying environmental problems are becoming more and more serious. Renewable energy (solar energy, wind energy, biomass energy, earth The utilization of thermal energy and tidal energy, etc.) has become an important concern of people. The growing demand for sustainable electricity and the discontinuity in the production capacity of intermittent renewable resources make the research and development of low-cost electrochemical energy storage systems an urgent need. [0003] In ord...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M50/44H01M50/46H01M50/403
CPCH01M4/587H01M50/44H01M50/46H01M50/403
Inventor 张朝峰陈琪吉恒松张龙海王睿李浩马权伟
Owner ANHUI UNIVERSITY