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Lithium titanate-carbon nanometer fiber flexible non-woven fabric, preparation method and applications thereof

A carbon nanofiber, lithium titanate technology, applied in microfiber electrodes, active material electrodes, electrical components, etc., can solve the problems of easy aggregation and shedding of lithium titanate particles, lower specific mass capacity, battery capacity attenuation, etc. Ensure cycle stability, improve specific mass capacity, and avoid the effects of agglomeration and shedding

Inactive Publication Date: 2018-06-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the solubility of titanium salt and lithium salt, the content of lithium titanate in the final composite material is less, resulting in a decrease in the overall specific mass capacity of the electrode after assembly into the battery (graphite C hardly contributes to the capacity in the range of 1-2.5V, However, the mass of graphite C should be included in the calculation of specific mass capacity)
In addition, lithium titanate nanoparticles are modified on the surface of fibers by hydrothermal methods. Although this method can control the content of lithium titanate to a certain extent, the lithium titanate particles on the surface of the fibers are easily damaged during the battery cycle. Aggregation and shedding, resulting in attenuation of battery capacity

Method used

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  • Lithium titanate-carbon nanometer fiber flexible non-woven fabric, preparation method and applications thereof
  • Lithium titanate-carbon nanometer fiber flexible non-woven fabric, preparation method and applications thereof
  • Lithium titanate-carbon nanometer fiber flexible non-woven fabric, preparation method and applications thereof

Examples

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Embodiment 1

[0039] In this embodiment, the titanium source compound is metatitanic acid, and the lithium source compound is lithium hydroxide. Include the following steps:

[0040] (1) Accurately measure 40ml of metatitanic acid dispersion liquid with a concentration of 3M in a beaker, add 2.3g of lithium hydroxide, ultrasonicate at a frequency of 60KHz for 1 hour, and then stir at a rotating speed of 600 revs for 6 hours to obtain the first mixed solution ;

[0041] (2) in the step (1), the first mixed solution is transferred to the reactor of 50mL, the hydrothermal reaction is kept at 120 degrees for 8 hours, and cooled to room temperature;

[0042] (3) washing the product obtained by the hydrothermal reaction in step (2) with water 3 times, and placing it in a vacuum oven at 70 degrees to dry for 12 hours to obtain lithium titanate precursor nanoparticles;

[0043] (4) taking 900 mg of the lithium titanate precursor nanoparticles obtained in step (3) and dispersing them in 4 g of dim...

Embodiment 2

[0065] Take the lithium titanate-carbon nanofiber flexible non-woven fabric prepared in Example 1, roll it with a roller press, and directly cut it as a lithium ion battery negative pole piece and a lithium sheet to assemble a lithium ion half battery.

Embodiment 3

[0072] In this embodiment, the titanium source compound is titanium dioxide, and the lithium source compound is lithium carbonate. Include the following steps:

[0073] (1) accurately measure 80ml of titanium dioxide dispersion liquid with a concentration of 0.5M in a beaker, add 1.5g of lithium carbonate, ultrasonicate at a frequency of 30KHz for 2 hours, and then stir at a rotating speed of 800 revs for 2 hours to obtain the first mixed solution;

[0074] (2) in the step (1), the first mixed solution is transferred to the reactor of 100mL, the hydrothermal reaction is kept at 160 degrees for 12 hours, and cooled to room temperature;

[0075] (3) washing the product obtained by the hydrothermal reaction in step (2) with water twice, and placing it in a vacuum oven at 60 degrees for drying for 24 hours to obtain lithium titanate precursor nanoparticles;

[0076] (4) taking 500 mg of the lithium titanate precursor nanoparticles obtained in step (3) and dispersing in 4 g of dim...

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Abstract

The invention discloses a lithium titanate-carbon nanometer fiber flexible non-woven fabric, a preparation method and applications thereof. The preparation method comprises: dissolving a lithium source in a titanium source dispersion liquid, carrying out a hydrothermal reaction to obtain lithium titanate precursor nanoparticles with uniform size, dispersing the lithium titanate precursor nanoparticles in polyacrylonitrile / dimethylformamide, and carrying out electrospinning and high-temperature calcination to finally obtain the lithium titanate-carbon nanometer fiber flexible non-woven fabric.According to the present invention, with the method, the proportion of lithium titanate in the composite material can be substantially increased so as to improve the specific mass capacity of the whole lithium titanate battery; and the inexpensive raw materials are used, and the particles are directly and simply dispersed in the sol to be spin, such that the spinning method is suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the chemical power supply technology, and particularly relates to a lithium titanate-carbon nanofiber flexible non-woven fabric and a preparation method and application thereof. Background technique [0002] In order to solve the problem of environmental pollution and energy depletion, as a new energy source, lithium-ion batteries have been widely used in various portable electronic devices and some electric vehicles. However, people's requirements for the safety and charging time of lithium-ion batteries are increasing day by day, and it is urgent to develop lithium-ion batteries with fast charge and discharge, high safety, low price, and long cycle life. In addition, with the booming development of portable and wearable electronics, ultrathin and bendable flexible Li-ion batteries have received more and more attention. Flexible lithium-ion batteries require that the electrode pole pieces can withstand bending or twisting, an...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M10/0525H01M4/02
CPCH01M4/364H01M4/485H01M4/583H01M10/0525H01M2004/022Y02E60/10
Inventor 周东山万远鑫徐晓茜左晨宋海媚王立杰薛奇王晓亮江伟陈葳季青
Owner NANJING UNIV
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