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High-performance lithium ion battery polyacrylonitrile carbon fiber negative electrode material and preparation method thereof

A polyacrylonitrile carbon fiber, lithium ion battery technology, applied in battery electrodes, secondary batteries, chemical characteristics of fibers, etc., can solve the problems of poor rate performance of layered graphite negative electrodes, increased lithium ion diffusion resistance, and small interlayer spacing. , to achieve the effect of increasing charge specific capacity, improving charge and discharge performance, and stable layered structure

Inactive Publication Date: 2021-08-06
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for layered graphite anode materials, in addition to the above disadvantages, the interlayer spacing is small, and Li+ can only be embedded from the end face of the material, which will inevitably increase the diffusion resistance of lithium ions.
Therefore, the rate performance of layered graphite anode is poor, limiting its application in high-power batteries

Method used

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  • High-performance lithium ion battery polyacrylonitrile carbon fiber negative electrode material and preparation method thereof
  • High-performance lithium ion battery polyacrylonitrile carbon fiber negative electrode material and preparation method thereof
  • High-performance lithium ion battery polyacrylonitrile carbon fiber negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1, PAN (polyacrylonitrile) powder is dissolved in DMF (N,N-dimethylformamide) solvent by mass percentage 13%, wherein PAN powder 1.95g, DMF solution 13.05g, keep stirring on the magnetic stirrer 12h obtain spinning solution;

[0032] Step 2, transfer the spinning solution to a 10ml syringe, install a stainless steel flat needle, the needle is a No. 20 needle, adjust the liquid flow rate to 1.2ml / h, the voltage to 18KV, and the acceptance distance to 15cm to observe a relatively stable nanometer Fibrous filaments, PAN precursors are obtained after continuous spinning for several hours;

[0033] Step 3, pre-oxidation: put the PAN precursor in a porcelain boat, in a tube furnace, in an oxygen atmosphere, raise the temperature from room temperature to 280 °C at 1 °C / min, keep it warm for 2 hours, and cool to room temperature to obtain a pre-oxidized wire;

[0034] Step 4, carbonization: heat the pre-oxidized filament from room temperature to 650°C at 1°C / min in a nitr...

Embodiment 2

[0037] Step 1, PAN (polyacrylonitrile) powder is dissolved in DMF (N,N-dimethylformamide) solvent by mass percentage 10%, wherein PAN powder 1.00g, DMF solution 9.00g, keep stirring on the magnetic stirrer 12h obtain spinning solution;

[0038] Step 2, transfer the spinning solution to a 10ml syringe, install a stainless steel flat needle, the needle is a No. 20 needle, adjust the liquid flow rate to 1.0ml / h, the voltage to 15KV, and the acceptance distance to 10cm to observe a relatively stable nanometer Fibrous filaments, PAN precursors are obtained after continuous spinning for several hours;

[0039] Step 3, pre-oxidation: put the PAN precursor in a porcelain boat, in a tube furnace, in an oxygen atmosphere, raise the temperature from room temperature to 280 °C at 1 °C / min, keep it warm for 2 hours, and cool to room temperature to obtain a pre-oxidized wire;

[0040] Step 4, carbonization: heat the pre-oxidized filament from room temperature to 650°C at 1°C / min in a nitro...

Embodiment 3

[0043] Step 1, PAN (polyacrylonitrile) powder is dissolved in DMF (N, N-dimethylformamide) solvent by mass percentage 18%, wherein PAN powder 1.50g, DMF solution 6.80g, keep stirring on the magnetic stirrer 12h obtain spinning solution;

[0044] Step 2, transfer the spinning solution to a 10ml syringe, install a stainless steel flat needle, the needle is a No. 20 needle, adjust the liquid flow rate to 1.7ml / h, the voltage to 20KV, and the acceptance distance to 18cm to observe a relatively stable nanometer Fibrous filaments, PAN precursors are obtained after continuous spinning for several hours;

[0045] Step 3, pre-oxidation: put the PAN precursor in a porcelain boat, in a tube furnace, in an oxygen atmosphere, raise the temperature from room temperature to 280 °C at 1 °C / min, keep it warm for 2 hours, and cool to room temperature to obtain a pre-oxidized wire;

[0046]Step 4, carbonization: heat the pre-oxidized filament from room temperature to 650°C at 1°C / min in a nitro...

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Abstract

The invention discloses a preparation method of a high-performance lithium ion battery polyacrylonitrile carbon fiber negative electrode material. The preparation method comprises the following steps of: dissolving polyacrylonitrile in a DMF solvent, and fully stirring to obtain a spinning solution; spinning the spinning solution to obtain stable nanofiber filaments, and continuously spinning to obtain polyacrylonitrile protofilaments; placing the polyacrylonitrile protofilaments in a porcelain boat, performing heating and pre-oxidizingin a tubular furnace under an oxygen atmosphere, and cooling to room temperature to obtain pre-oxidized fibers; carbonizing the pre-oxidized fibers in the tubular furnace in a nitrogen atmosphere, and naturally cooling the carbonized pre-oxidized fibers to room temperature to obtain polyacrylonitrile carbon fibers; fully grinding the carbonized polyacrylonitrile carbon fibers in an agate mortar, and drying an obtained substance to obtain the superfine electrostatically-spun polyacrylonitrile carbon fiber material. The lithium ion battery polyacrylonitrile carbon fiber negative electrode material has the advantages of high performance, high capacity, high cycling stability, high charging specific capacity and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a preparation method of a lithium ion battery negative electrode material, in particular to a high-performance lithium ion battery polyacrylonitrile carbon fiber negative electrode material and a preparation method thereof. Background technique [0002] Due to its excellent energy storage characteristics, lithium-ion batteries are widely used in mobile communications, information technology, consumer electronics, mobile vehicles and other fields. With the progress and development of human society, advanced lithium-ion batteries need to have higher capacity, better rate performance and longer service life. Among all components of lithium-ion batteries, electrode materials are the key factors restricting the performance of lithium-ion batteries. Among them, the anode material, as an important part of the lithium-ion battery, has an important impact on the electrochemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525D01F6/18D01F9/22B82Y30/00B82Y40/00
CPCH01M4/583H01M10/0525D01F9/22D01F6/18B82Y40/00B82Y30/00Y02E60/10
Inventor 饶先发钟盛文陈军楼轶韬李宝宝邱玉萍吴婷婷钟晓辉程斌
Owner JIANGXI UNIV OF SCI & TECH
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