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Preparation method of silver-doped carbon-encapsulated lithium titanate composite negative electrode material

A technology of carbon-coated lithium titanate and negative electrode materials, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of poor high-current discharge performance and poor conductivity, and achieve improved conductivity, long service life, and improved conductivity. Effects on Sexuality and Cyclic Stability

Inactive Publication Date: 2013-07-17
廖小玉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a negative electrode material for lithium-ion batteries, lithium titanate has an intrinsic conductivity of 10 -9 S / cm, which is a typical insulator, has poor conductivity and poor high-current discharge performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve tetrabutyl titanate in a certain amount of deionized water to form a tetrabutyl titanate solution with a concentration of 1mol / L; dissolve lithium chloride in a certain amount of deionized water to form a chloride solution with a concentration of 2mol / L Lithium solution, mix the above two solutions, and keep the molar ratio n Li :n Ti =1:1.05, according to Ag accounting for 2‰ of the total weight of the product, add silver nitrate solution, magnetically stir for 1h; then pour it into a high-temperature reaction kettle, and then place it in an oven at 170°C for 8h. After the reaction, cool naturally to room temperature. Suction filtration was then performed, washed alternately with deionized water and ethanol, and dried at 70°C to obtain the precursor, which was sintered at 500°C for 4 h under a protective atmosphere to obtain silver-doped lithium titanate nanomaterials.

[0015] According to the mass ratio of polyvinylpyrrolidone and carbon nanotubes of 0.2:1,...

Embodiment 2

[0019] Dissolve tetrabutyl titanate in a certain amount of deionized water to form a tetrabutyl titanate solution with a concentration of 2mol / L; dissolve lithium chloride in a certain amount of deionized water to form a chlorine concentration of 2.5mol / L Lithium chloride solution, mix the above two solutions, and keep the molar ratio n Li :n Ti =1:1.1, according to Ag accounting for 5‰ of the total weight of the product, add silver nitrate solution, stir magnetically for 2 hours; then pour it into a high-temperature reaction kettle, and then place it in an oven at 210°C for 6 hours. After the reaction, cool naturally to room temperature. Suction filtration was then performed, washed alternately with deionized water and ethanol, and dried at 90°C to obtain the precursor, which was sintered at 650°C for 2 h under a protective atmosphere to obtain silver-doped lithium titanate nanomaterials.

[0020] According to the mass ratio of polyvinylpyrrolidone and carbon nanotubes of 0....

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Abstract

The invention relates to a preparation method of a silver-doped carbon-encapsulated lithium titanate composite negative electrode material. The preparation method comprises the following steps of: (1) dissolving tetrabutyl titanate in deionized water to form a tetrabutyl titanate solution, dissolving lithium chloride in a certain amount of deionized water to form a lithium chloride solution, mixing the tetrabutyl titanate solution and the lithium chloride solution, then adding a silver nitrate solution, carrying out magnetic stirring, then pouring the solution subjected to magnetic stirring to a high-temperature reaction kettle, then putting the solution into a drying oven to react, carrying out suction filtering after the reaction is ended, alternately washing the reactant subjected to suction filtering by using deionized water and ethanol, drying to obtain a precursor, and sintering to obtain a silver-doped lithium titanate nanomaterial; and (2) adding carbon nanotubes and polyvinylpyrrolidone to the deionized water, carrying out ultrasonic treatment to obtain a suspension, adding the silver-doped lithium titanate nanomaterial to the suspension, carrying out ultrasonic treatment to obtain a mixed suspension, carrying out suction filtering, washing, drying and grinding to obtain a precursor, and sintering the precursor to obtain the silver-doped carbon-encapsulated lithium titanate composite negative electrode material. A lithium ion battery prepared by using the preparation method is faster in charging and discharge rate and longer in service life.

Description

Technical field [0001] The invention relates to a preparation method of a silver-doped carbon-coated lithium titanate composite negative electrode material. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and good safety performance. Therefore, they are widely used in portable electronic products such as digital cameras, mobile phones, and notebook computers. They also have application prospects for electric bicycles and electric vehicles. The anode materials of current commercial lithium-ion batteries are graphite and other forms of carbon materials. However, its low lithium intercalation potential limits its application range. [0003] Lithium titanate (Li 4 Ti 5 o 12 ) is considered to be one of the most promising anode materials. During the process of lithium ion intercalation and removal, the volume of the spinel lithium titanate unit cell is basically unchanged, so it is called "zero strain" mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCY02E60/10
Inventor 廖小玉
Owner 廖小玉
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