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Preparation method of lithium titanate-nickel oxide nanofiber composite material for lithium battery

A technology of nanofibers and composite materials, applied in nanotechnology, battery electrodes, nanotechnology, etc. for materials and surface science, it can solve the problems of poor cycle performance and large particle agglomeration, and achieve fine particle size and high specific capacity. , the effect of uniform distribution

Active Publication Date: 2014-12-10
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lithium titanate-nickel oxide composite material prepared by this method has large particle agglomeration, and after 30 cycles at a small rate of 0.2C, the best discharge specific capacity is 228mAh / g, and the cycle performance is not good.

Method used

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  • Preparation method of lithium titanate-nickel oxide nanofiber composite material for lithium battery
  • Preparation method of lithium titanate-nickel oxide nanofiber composite material for lithium battery
  • Preparation method of lithium titanate-nickel oxide nanofiber composite material for lithium battery

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Effect test

Embodiment 1

[0026] The preparation method of lithium titanate-nickel oxide nanofiber composite material for lithium battery comprises the following steps:

[0027] (1) Select polyvinyl alcohol (PVA) as the polymer carrier, sodium dodecylbenzenesulfonate as the surfactant, and water as the solvent to prepare 15% PVA and 1% sodium dodecylbenzenesulfonate The solution is stirred by ultrasonic vibration to form a uniform, stable and clear carrier solution.

[0028] (2) The mass fraction of the lithium source in the solution is 17.76%, and the mass fraction of the nickel source in the solution is 1%. Add industrial grade lithium nitrate and nickel acetate to the water respectively, and stir at a constant temperature of 80° C. until the solute is dissolved.

[0029] (3) Add hydrogen peroxide accounting for 5% of the solution mass to the solution in step (2), stir evenly, add technical grade titanium propoxide according to the molar ratio of titanium and lithium at 4:5, and add ammonia to adjust...

Embodiment 2

[0034] (1) Select polyvinylpyrrolidone (PVP) as the polymer carrier, sodium dodecylbenzenesulfonate as the surfactant, and ethanol as the solvent to prepare 50% PVP and 1% sodium dodecylbenzenesulfonate The solution is stirred by ultrasonic vibration to form a uniform, stable and clear carrier solution.

[0035](2) According to the mass fraction of the lithium source in the solution being 20%, and the mass fraction of the nickel source in the solution being 9.89%, add chemically pure lithium hydroxide and nickel acetate to water respectively, and stir at a constant temperature of 30°C until the solute is in a dissolved state .

[0036] (3) Add hydrogen peroxide accounting for 1% of the solution mass fraction to the solution in step (2), stir evenly, add chemically pure tetrabutyl titanate according to the titanium and lithium molar ratio of 4:5, and add ammonia water to adjust the pH to 10.5 , heated at a constant temperature of 30°C and stirred vigorously until all dissolved...

Embodiment 3

[0041] (1) Select polyacrylonitrile (PAN) as the high molecular polymer carrier, Polyethylene Glycol is surfactant, N-N dimethylformamide is solvent, prepares the solution that contains 6%PAN, 0.6% Polyethylene Glycol, After ultrasonic vibration and stirring, a uniform, stable and clear carrier solution is formed.

[0042] (2) The mass fraction of the lithium source in the solution is 9%, and the mass fraction of the nickel source in the solution is 14.16%. Add analytically pure lithium acetate and nickel acetate in water respectively, and stir at a constant temperature of 80° C. until the solute is dissolved.

[0043] (3) Add hydrogen peroxide accounting for 3% of the solution mass fraction to the solution in step (2), stir evenly and add analytically pure titanium acetylacetonate at a molar ratio of titanium to lithium of 4:5, and add ammonia to adjust the pH to 8.5, and keep the temperature constant Heat at 50°C and stir vigorously until all dissolved to obtain a uniform an...

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Abstract

The invention relates to a preparation method of a lithium titanate-nickel oxide nanofiber composite material for a lithium battery. The preparation method comprises the steps: firstly, dissolving a high-molecular polymer carrier and a surfactant in a solvent, and stirring to obtain a carrier solution; respectively adding a lithium source and a nickel source into water; after constant-temperature mixing to obtain a mixture, adding hydrogen peroxide into the mixture; after uniformly mixing, adding a titanium source and regulating pH by using ammonium hydroxide; after constant-temperature mixing to obtain a solution, adding the solution into the carrier solution, mixing to form a precursor solution; then performing electrostatic spinning on the precursor solution to obtain a nanofiber precursor; and finally after pre-decomposing and sintering the nanofiber precursor, quenching in liquid nitrogen or water to obtain the lithium titanate-nickel oxide nanofiber composite material for the lithium battery. The nanofiber composite material disclosed by the invention is uniform in distribution, controllable in particle size, and excellent in electrochemical performance, and can be widely applied to the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method of a lithium titanate-nickel oxide nanofiber composite material for a lithium battery. Background technique [0002] With the increasingly prominent energy and environmental issues, the development of electric vehicles, especially pure electric vehicles, is imperative. At present, the bottleneck restricting the development of electric vehicles is whether to develop cheap, safe and environment-friendly secondary batteries. As the power source of electric vehicles, the performance of secondary batteries is directly related to various technical indicators of the vehicle, such as acceleration performance, climbing performance, mileage, top speed, etc. Lithium-ion batteries are recognized as the most promising electric vehicle power batteries due to their high specific energy and high specific power. According to the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/485H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 张荣良孔祥伟
Owner JIANGSU UNIV OF SCI & TECH
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