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Preparation method of nanofiber lithium titanate composite material

A technology of fiber lithium titanate and composite materials, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, electrical components, etc., can solve the problems of lithium titanate ion conductivity and poor electronic conductivity, and achieve high electronic and Ionic conductivity, high rate performance, and good cycle stability

Inactive Publication Date: 2018-02-16
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of nanofiber lithium titanate composite material to solve the problem of poor ion conductivity and electronic conductivity of lithium titanate, so as to obtain nanofiber lithium titanate and its composite material

Method used

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  • Preparation method of nanofiber lithium titanate composite material
  • Preparation method of nanofiber lithium titanate composite material
  • Preparation method of nanofiber lithium titanate composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 1.75g ​​of polyvinylpyrrolidone into 8.45g of ethanol, and stir to form a stable polyvinylpyrrolidone / ethanol sol. According to Li:Ti=4.4:5 molar ratio, add 5.00g tetrabutyl titanate and 1.32g lithium acetate to 5.63g ethanol, and add 4.63g acetic acid, stir until the solution is clear, add this solution to polyvinylpyrrolidone / ethanol sol, stirred for 5 h, and ultrasonically dispersed for 0.5 h to obtain an electrospinning precursor. An electrospinning machine was used for electrospinning, the spinning speed was 2mL / h, the electrostatic voltage was 25kV, and the distance between the receiving plate was 20cm to obtain the electrospinning precursor film. The precursor film was sintered at 750 °C for 3 h under the protection of argon, as figure 1 Nanofiber lithium titanate / carbon is obtained as shown.

Embodiment 2

[0030] Such as Figure 2-5As shown, 1.75g ​​of polyvinylpyrrolidone was added into 8.45g of ethanol, and stirred to form a stable polyvinylpyrrolidone / ethanol sol. According to Li:Ti=4.4:5 molar ratio, add 5.00g tetrabutyl titanate and 1.32g lithium acetate to 5.63g ethanol, and add 4.63g acetic acid, stir until the solution is clear, add this solution to polyvinylpyrrolidone / ethanol sol, stirred for 5 h, added 0.08 g of graphene, and ultrasonically dispersed for 1 h to obtain a graphene-doped lithium titanate sol precursor. An electrospinning machine was used for electrospinning, the spinning speed was 2mL / h, the electrostatic voltage was 25kV, and the distance between the receiving plate was 20cm to obtain the electrospinning precursor film. The precursor film was sintered at 750°C for 3h under the protection of argon to obtain the nanofiber lithium titanate / carbon / graphene composite material. According to the mass ratio of 85:10:5, the negative electrode active material ...

Embodiment 3

[0032] Add 1.75g ​​of polyvinylpyrrolidone into 8.45g of ethanol, and stir to form a stable polyvinylpyrrolidone / ethanol sol. According to Li:Ti=4.4:5 molar ratio, add 5.00g tetrabutyl titanate and 1.32g lithium acetate to 5.63g ethanol, and add 4.63g acetic acid, stir until the solution is clear, add this solution to polyvinylpyrrolidone / ethanol sol, stirred for 5 h, added 0.16 g of graphite oxide, and ultrasonically dispersed for 1 h to obtain a lithium titanate sol precursor doped with graphite oxide. An electrospinning machine was used for electrospinning, the spinning speed was 2mL / h, the electrostatic voltage was 25kV, and the distance between the receiving plate was 20cm to obtain the electrospinning precursor film. The precursor film was sintered at 750°C for 3h under the protection of argon to obtain the nanofiber lithium titanate / carbon / graphene composite material.

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Abstract

The invention relates to nanofiber lithium titanate and a composite material thereof obtained by the steps of preparing a lithium titanate sol precursor or an electroconductive carbon material doped lithium titanate sol precursor by adopting an ultrasonic dispersion technology, carrying out electrostatic spinning on the sol precursor to obtain a nanofiber precursor, and carrying out high temperature sintering on the nanofiber precursor in an oxygen-free inert atmosphere. The composite material has relatively high electron and ion conductivity, high rate performance and high cycle stability, and is applicable for serving as materials for lithium ion batteries and supercapacitors.

Description

technical field [0001] The invention relates to a preparation method of a nanofiber lithium titanate composite material, belonging to the technical field of lithium ion batteries and supercapacitors. Background technique [0002] In today's era, non-renewable resources such as coal, oil, and natural gas are increasingly depleted, and environmental issues have attracted more and more attention. The development and utilization of renewable resources has become an important issue for human survival and development. The energy density and power density of traditional lead-acid batteries and nickel-metal hydride batteries can no longer meet the requirements of future energy storage systems, especially with the wide application of various portable electronic devices such as electric vehicles, notebook computers, and digital cameras, the reversibility of batteries Higher storage capacity and stability requirements, and longer service life are required, so research and development o...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525H01G11/50H01G11/30H01G11/86
CPCH01G11/30H01G11/50H01G11/86H01M4/485H01M10/0525Y02E60/10Y02E60/13
Inventor 陈书礼荣常如韩金磊韩玉涛张克金米新艳张苡铭魏晓川
Owner CHINA FIRST AUTOMOBILE
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