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Preparation method of porous titanium/carbon niobate composite microsphere

A porous niobium and carbon composite technology, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of harsh preparation conditions, high production costs, and complicated preparation processes, and achieve simple methods, short preparation cycles, and improved The effect of cycle performance

Inactive Publication Date: 2016-11-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can synthesize porous titanium niobate microspheres with excellent electrochemical performance, they have disadvantages such as complex preparation process, high production cost, and harsh preparation conditions. Therefore, a new synthetic porous titanium niobate microsphere has been developed. method is particularly important

Method used

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  • Preparation method of porous titanium/carbon niobate composite microsphere
  • Preparation method of porous titanium/carbon niobate composite microsphere
  • Preparation method of porous titanium/carbon niobate composite microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 26.6 g of niobium pentoxide, 8.0 g of titanium dioxide, and 345 ml of deionized water, pour them into ball mill jars, and then add 400 g of ball mills. Ball milled at 300 r / min for 10 h to obtain a suspension with good dispersibility. Dissolve 400 mg of sucrose in 20 ml of deionized water and stir magnetically for 2 h to obtain a clear sucrose solution. The clear solution was poured into the suspension, and ball milled at a speed of 6000 r / min for 6 h to obtain a suspension with good dispersibility. Transfer the suspension to a 500ml beaker, place it in an ultrasonic cleaner for ultrasonic dispersion, and then set up the spray drying program: the speed of the peristaltic pump is 35 rpm, the diameter of the nozzle is 1 mm, the air inlet temperature is 200 °C, and the needle is 5 times / min, fan speed 25 m 3 / h, finally start the spray drying program to carry out the spray drying experiment, collect the sprayed titanium niobate precursor powder, and transfer it to ...

Embodiment 2

[0021] Weigh 26.6 g of niobium pentoxide, 8.0 g of titanium dioxide, and 340 ml of deionized water, pour them into ball mill jars, and then add 410 g of ball mills. After ball milling at 350 r / min for 12 h, a suspension with good dispersibility was obtained. Dissolve 405 mg of sucrose in 21 ml of deionized water and stir magnetically for 2.5 h to obtain a clear sucrose solution. The clear solution was poured into the suspension, and ball milled at a speed of 6000 r / min for 6.5 h to obtain a suspension with good dispersibility. Transfer the suspension to a 500 ml beaker; then, place the beaker in an ultrasonic cleaner for ultrasonic dispersion, and then set the spray drying program: peristaltic pump speed 30 rpm, nozzle diameter 1 mm, air inlet temperature 220 ℃, 6 needle passes / min, fan speed 20 m 3 / h, finally start the spray drying program to carry out the spray drying experiment, collect the sprayed titanium niobate precursor powder, and transfer it to the sample bag for ...

Embodiment 3

[0023] Weigh 26.6 g of niobium pentoxide, 8.0 g of titanium dioxide, and 345 ml of deionized water, pour them into ball mill jars, and then add 410 g of ball mills. Ball milled at 250 r / min for 10 h to obtain a suspension with good dispersibility. Dissolve 400 mg of sucrose in 21 ml of deionized water and stir magnetically for 2 h to obtain a clear sucrose solution. The clear solution was poured into the suspension, and ball milled at a speed of 6000 r / min for 6.5 h to obtain a suspension with good dispersibility. Transfer the suspension to a 500 ml beaker; then, place the beaker in an ultrasonic cleaner for ultrasonic dispersion, and then set the spray drying program: peristaltic pump speed 45 rpm, nozzle diameter 0.7 mm, air inlet temperature 220 ℃, 7 needle passes / min, fan speed 30 m 3 / h, finally start the spray drying program to carry out the spray drying experiment, collect the sprayed titanium niobate precursor powder, and transfer it to the sample bag for future use....

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Abstract

The invention belongs to the technical field of synthesis of nanometer materials, and specifically discloses a preparation method of a porous titanium / carbon niobate composite microsphere. The preparation method is used for successfully preparing the porous titanium / carbon niobate composite microsphere with a multilevel structure by selecting titanium dioxide as a titamium source, selecting niobium pentoxide as a niobium source, selecting saccharose as a carbon source, selecting deionized water as a solvent and carrying out processes such as ball milling, spray drying and heat treatment in sequence. Having a relatively high theoretical specific capacity (388 mA.h / g) and a relatively large specific surface area, the porous titanium / carbon niobate composite microsphere is expected to replace lithium titanate to serve as a lithium ion battery cathode material. In addition, the preparation method has the advantages of being simple in preparation process and relatively short in preparation period, is very suitable for industrial large-scale production and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanometer material synthesis, and in particular relates to a method for preparing porous titanium niobate / carbon composite microspheres assembled from small nanometer particles. Background technique [0002] Although lithium-ion secondary batteries have made significant progress in recent decades, it is still challenging to develop lithium-ion secondary batteries with high safety factor, high energy density, high power density, and low cost. Currently commonly used lithium-ion battery anode materials mainly include carbon materials (graphite), metal oxides (TiO 2 ), simple metals (Sn, Si), Li 4 Ti 5 o 12 and TiNb 2 o 7 Wait. Carbon materials pose a safety hazard due to the appearance of lithium dendrites during charging and discharging [1-5] ; The large volume change of the metal element during the charging and discharging process leads to poor cycle performance [6] ; metal oxides and Li 4 Ti 5 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/364H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 车仁超朱国振张捷
Owner FUDAN UNIV
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