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Graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material and preparation method thereof

A technology of ferroferric oxide and nanofibers, which is applied in battery electrodes, fiber treatment, secondary batteries, etc., can solve the problems of poor charge transmission and diffusion performance, volume change particle agglomeration, and poor cycle stability, so as to improve cycle stability The effect of high performance and rate performance, simple processing, and large porosity

Inactive Publication Date: 2015-12-23
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fe 3 o 4 It is one of the negative electrode materials with great development potential, with high specific capacity (926mAh / g) and good electronic conductivity (σ=2×10 4 S / m, superior to other transition metal oxides), low price, abundant resources, non-toxic and environmentally friendly, but in the process of intercalation and delithiation, huge volume changes and serious particle agglomeration will occur, resulting in charge and Li + Poor transmission and diffusion performance, poor cycle stability and low rate performance as a negative electrode material

Method used

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  • Graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material and preparation method thereof
  • Graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material and preparation method thereof

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Embodiment 1

[0020] The preparation method of the porous carbon / ferric oxide nanofiber lithium battery negative electrode material doped with graphene adopts the following steps:

[0021] (1) Put graphene oxide into N-N dimethylformamide, ultrasonically disperse it for 8 hours, add polyacrylonitrile powder, polymethyl methacrylate powder and iron salt, and stir at 80°C for 4 hours to obtain electrospun silk solution. The mass fraction of polyacrylonitrile is 6-10%, the mass fraction of polymethyl methacrylate is 5-10%, and the mass fraction of iron salt is 20-30%;

[0022] (2) Transfer the electrospinning solution obtained in step (1) to a syringe for electrospinning. The spinning voltage is 10-30kv, the spinning flow rate is 0.1-2.0ml / h, and the distance between the needle tip and the receiving plate is 10-30cm;

[0023] (3) Pre-oxidize the nanofibers obtained in step (2) at 200-300°C in an air atmosphere, and then transfer them to a carbonization furnace. The rate is raised to 600°C, ...

Embodiment 2

[0028] The preparation method of the porous carbon / ferric oxide nanofiber lithium battery negative electrode material doped with graphene adopts the following steps:

[0029] (1) Put graphene oxide into N-N dimethylformamide, ultrasonically disperse for 8 hours, add polyacrylonitrile powder, polymethyl methacrylate powder and iron salt, and stir at 80°C for 5 hours to obtain electrospun Silk solution, the mass fraction of polyacrylonitrile is 6-10%, the mass fraction of polymethyl methacrylate is 5-10%, and the mass fraction of iron salt is 20-30%;

[0030] (2) Transfer the electrospinning solution obtained in step (1) to a syringe for electrospinning, the spinning voltage is 10-30kv, the spinning flow rate is 0.1-2.0ml / h, the distance between the needle tip and the receiving plate The distance is 10-30cm;

[0031] (3) Pre-oxidize the nanofibers obtained in step (2) at 200-300°C in an air atmosphere, and then transfer them to a carbonization furnace. The rate is raised to 65...

Embodiment 3

[0034] The preparation method of the porous carbon / ferric oxide nanofiber lithium battery negative electrode material doped with graphene adopts the following steps:

[0035] (1) Put graphene oxide into N-N dimethylformamide, ultrasonically disperse for 8 hours, add polyacrylonitrile powder, polymethyl methacrylate powder and iron salt, and stir at 80°C for 5 hours to obtain electrospun silk solution. The mass fraction of polyacrylonitrile is 6-10%, the mass fraction of polymethyl methacrylate is 5-10%, and the mass fraction of iron salt is 20-30%;

[0036] (2) Transfer the electrospinning solution obtained in step (1) to a syringe for electrospinning. The spinning voltage is 10-30kv, the spinning flow rate is 0.1-2.0ml / h, and the distance between the needle tip and the receiving plate is 10-30cm;

[0037] (3) Pre-oxidize the nanofibers obtained in step (2) at 200-300°C in an air atmosphere, and then transfer them to a carbonization furnace. The rate is raised to 700°C, and...

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Abstract

The invention relates to a graphene-doped porous carbon / ferroferric oxide nano-fiber lithium battery anode material and a preparation method thereof. The preparation method comprises the following steps of preparing ferric salt and graphene-doped polyacrylonitrile / polymethyl methacrylate nano-fibers by utilizing electro-spinning technique, and obtaining the graphene-doped porous carbon / ferroferric oxide nano-fiber lithium battery anode material through pre-oxidization and high-temperature carbonization. The specific preparation method comprises the following steps of adding a certain amount of ferric salt and oxidized graphene into mixed solution of polyacrylonitrile / polymethyl methacrylate, obtaining electro-spinning solution after ultrasonic dispersion and high-speed stirring and dissolution, pre-oxidizing the nano-fibers obtained by electro-spinning at 200-300 DEG C, and obtaining the graphene-doped porous carbon / ferroferric oxide nano-fiber lithium battery anode material after carbonizing at 500-1000 DEG C. According to the graphene-doped porous carbon / ferroferric oxide nano-fiber lithium battery anode material prepared by the invention, the electrochemical performance can be effectively collaborative, and the specific capacity, the initial charge-discharge efficiency and the cycling performance of the battery are improved.

Description

technical field [0001] The invention relates to a graphene-doped porous carbon / ferric oxide nanofiber lithium battery negative electrode material and a preparation method thereof, which are applied to lithium battery electrode materials, and specifically relate to the technical field of chemical energy storage. Background technique [0002] The energy problem is one of the greatest challenges faced by human beings. To solve this problem, people are constantly striving to develop new energy sources. At the same time, energy storage technology has also put forward higher and higher requirements. Lithium-ion batteries, on the other hand, have dominated the market for portable electronics since their commercialization in the 1990s. At the same time, with the further miniaturization of many mobile electronic devices such as mobile phones, digital cameras, and notebook computers, people's demand for new power supplies with small volume and high energy is becoming more and more urg...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/52H01M10/0525D01D5/00
CPCH01M4/523H01M4/583H01M10/0525Y02E60/10
Inventor 何建新连艳平韩啟明王利丹谭卫琳丁彬崔世忠
Owner ZHONGYUAN ENGINEERING COLLEGE
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