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Titanium dioxide/niobium-titanium oxide composite material as well as preparation and application thereof

A technology of niobium-titanium oxide and titanium dioxide, applied in the field of lithium-ion batteries, can solve the problems of low electronic and lithium-ion conductivity, reduced material volume energy density, etc., and achieve reduced diffusion distance, high packing density, and high batch stability. Effect

Inactive Publication Date: 2014-02-19
海悦高科电池技术(大连)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when titanium dioxide is used alone as the anode material of lithium-ion batteries, its electronic and lithium ion conductivity are low, so the high-rate discharge conditions have to be reduced by reducing the dimension and scale of the material, but the direct consequence of reducing the dimension and scale is the volume of the material. A drastic reduction in energy density

Method used

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  • Titanium dioxide/niobium-titanium oxide composite material as well as preparation and application thereof
  • Titanium dioxide/niobium-titanium oxide composite material as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Dissolve 6.8g tetrabutyl titanate in 50ml ethanol solvent to form a clear solution; then add 10.2g niobium chloride to the solution and stir until the solution is clear to obtain a slightly yellow clear solution; then transfer the solution into In a sealable polytetrafluoroethylene reaction kettle, seal the polytetrafluoroethylene container in a stainless steel jacket, put the stainless steel jacket in a heater, raise the temperature to 150°C, and keep it warm for 15 hours. After the reaction was complete, the furnace was cooled to room temperature. The product after the reaction is a mixture of solution and solid phase. The reacted product was filtered and washed 3 times with ethanol to obtain a white solid powder. The titanium dioxide / niobium titanium oxide composite material is obtained after the powder is dried in vacuum at 60°C. The composite material is: anatase-type titanium dioxide particles are dispersed on the surface of a spherical amorphous niobium-titanium...

Embodiment 2

[0034] 3.2g of tetrabutyl titanate was dissolved in 60ml of ethanol solvent to form a clear solution; then 7.1g of niobium chloride was added to the solution and stirred until the solution was clear to obtain a slightly yellow clear solution; then the solution was transferred into In a sealable polytetrafluoroethylene reaction kettle, seal the polytetrafluoroethylene container in a stainless steel jacket, put the stainless steel jacket in a heater, raise the temperature to 170° C., and keep it warm for 8 hours. After the reaction was complete, the furnace was cooled to room temperature. The reacted product is a mixture of solution and solid phase. The reacted product was filtered and washed three times with ethanol repeatedly to obtain a white solid powder. The titanium dioxide / niobium titanium oxide composite material is obtained after the powder is dried in vacuum at 60°C. The composite material is: anatase-type titanium dioxide particles are dispersed on the surface of a ...

Embodiment 3

[0037] Dissolve 3.2g tetrabutyl titanate in 70ml ethanol solvent to form a clear solution; then add 5.5g niobium oxalate to the solution and stir until the solution is clear to obtain a slightly yellow clear solution; In a sealed polytetrafluoroethylene reaction kettle, seal the polytetrafluoroethylene container in a stainless steel jacket, put the stainless steel jacket in a heater, raise the temperature to 190° C., and keep it warm for 12 hours. After the reaction was complete, the furnace was cooled to room temperature. The reacted product is a mixture of solution and solid phase. The reacted product was filtered and washed three times with ethanol repeatedly to obtain a white solid powder. The titanium dioxide / niobium titanium oxide composite material is obtained after the powder is dried in vacuum at 60°C. The composite material is: anatase-type titanium dioxide particles are dispersed on the surface of a spherical amorphous niobium-titanium oxide, and the amorphous nio...

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Abstract

The invention relates to a titanium dioxide / niobium-titanium oxide composite material as well as the preparation and application thereof, and belongs to the field of lithium ion batteries. According to the titanium dioxide / niobium-titanium oxide composite material, anatase type titanium dioxide particles are distributed on the surface of a spherical amorphous niobium-titanium oxide, and the amorphous niobium-titanium oxide is a compound with the general formula of TixNbyO2x+2.5y, wherein x ranges from 0.1 to 1, and y ranges from 1 to 2. The composite material adopts the subcritical solvothermal method, and the synthesis and recombination of components of the composite material are completed synchronously, so as to ensure good dispersity and interfacial compatibility of the system. The composite material has both the advantage of high bulk density of the micron-scale spherical electrode material and the advantage of short lithium ion diffusion distance of a nanometer material, so that the composite material achieves excellent electrochemical activity.

Description

technical field [0001] The invention relates to a titanium dioxide / niobium-titanium oxide composite material and its preparation and application, in particular to a titanium dioxide / niobium-titanium oxide that can be used as a lithium-ion battery negative electrode material with high coulombic efficiency, good safety performance, and good cycle performance A composite negative electrode system and a preparation method thereof belong to the field of lithium ion batteries. Background technique [0002] As a green device for high-efficiency electrical energy storage and conversion, lithium-ion batteries are considered to be an ideal power source for small vehicles to truly achieve zero emissions. Traditional lithium-ion batteries use carbon materials as their negative electrode materials. Carbon materials themselves are mixed conductors of ions and electrons, and have low charge and discharge voltages. They are the materials with the best comprehensive electrochemical performan...

Claims

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Application Information

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IPC IPC(8): H01M4/48B82Y30/00
CPCB82Y30/00H01M4/483Y02E60/10
Inventor 文钟晟王冠琴张钟元李嵩孙俊才季世军
Owner 海悦高科电池技术(大连)有限公司
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