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Preparation method of hydrogenated lithium titanate nano-material

A technology of lithium hydride titanate and nanomaterials, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve the problems of small particle size, high preparation cost, and poor conductivity of lithium hydride titanate, and achieve huge commercial potential, lower calcination temperature, and improve lithium storage performance

Inactive Publication Date: 2013-10-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is aimed at lithium ion battery anode material Li in the prior art 4 Ti 5 o 12 Due to the disadvantages of poor electrical conductivity, high preparation cost, high energy consumption, long calcination time and complicated process, a hydrogenation technology is proposed to prepare lithium hydrogenated titanate nanoparticles by using commercial titanium dioxide as a titanium source. The present invention The prepared lithium hydride titanate has a small particle size and high electronic and ion conductivity

Method used

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  • Preparation method of hydrogenated lithium titanate nano-material
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  • Preparation method of hydrogenated lithium titanate nano-material

Examples

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Embodiment 1

[0026] (1) Add 0.4 g (0.05 mol) of titanium dioxide powder to 40 mL of 2.5 M LiOH (0.1 mol) aqueous solution, stir well, and then place it in an oven at 80 °C for 10 h in a closed environment;

[0027] (2) Stop heating, naturally cool the sample in step 1 to room temperature, suction filter, wash to neutrality, and dry to obtain lithium titanium oxide precursor powder;

[0028] (3) The precursor powder in step 2 is calcined at 600 °C for 2 h in a mixed atmosphere of hydrogen and argon containing 5% (volume percent) of hydrogen to obtain lithium hydride titanate nanomaterials.

[0029] Electron microscope scanning is performed on the obtained lithium hydride titanate nanomaterials, such as figure 1 It can be seen that the obtained lithium titanate material is nanoparticles with good dispersibility, the particle size distribution is 15-30 nm, and the electronic conductivity is 3.8×10 -7 S cm -1 , the specific capacity curve of the material by assembling into a button battery ...

Embodiment 2

[0031] (1) Weigh 0.4 g (0.05 mol) of titanium dioxide powder into 40 mL of 2.5 M LiOH (0.1 mol) aqueous solution, stir evenly, and then place it in an airtight oven at 80°C for 10 h;

[0032] (2) Stop heating and cool the sample in step 1 to room temperature naturally. Take out the sample for suction filtration, wash to neutrality, and dry to obtain lithium titanium oxide precursor powder;

[0033] (3) calcining the precursor powder in step 2 at 600 °C for 2 h in an air atmosphere to obtain lithium titanate nanomaterials .

[0034] The obtained lithium hydride titanate nanomaterial was tested, and the electronic conductivity was measured to be 2.1×10 -12 S cm -1 .

Embodiment 3

[0036] (1) Weigh 0.4 g (0.05 mol) of titanium dioxide powder into 40 mL of 2.5 M LiOH (0.1 mol) aqueous solution, stir evenly, and then place it in an airtight oven at 80°C for 10 h;

[0037] (2) Stop heating and cool the sample in step 1 to room temperature naturally. Take out the sample for suction filtration, wash to neutrality, and dry to obtain lithium titanium oxide precursor powder;

[0038] (3) The precursor powder in step 2 was calcined at 500 °C for 2 h in a mixed atmosphere of 5% hydrogen and argon to obtain lithium hydride titanate nanomaterials.

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Abstract

The invention discloses a preparation method of a hydrogenated lithium titanate nano-material. The method comprises the specific steps of: adding titanium dioxide into an aqueous solution of a water-soluble lithium salt, uniformly stirring, then placing the mixture in an enclosed environment and insulating; stopping heating, cooling, conducting pumping the mixture, conducting filtration and washing, and drying to obtain a lithium titanate precursor powder; and calcining the precursor powder in a mixed atmosphere of hydrogen and protection gas to obtain hydrogenated lithium titanate nanometer particles. The hydrogenated lithium titanate nanometer powder electrode material prepared by the method of the invention can be used as a cathode material for preparation of a super capacitor or a lithium battery.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a preparation method of lithium hydride titanate nanometer material. Background technique [0002] Energy is an indispensable driving force for human survival and development, but traditional fossil energy such as coal and oil is expensive, non-renewable, and causes serious environmental pollution, so it is bound to become exhausted. In the development of new energy, energy storage and conversion are the key to a series of major applications in the future. Supercapacitors and lithium-ion batteries have become direct and efficient energy storage and conversion devices. [0003] At present, most commercial lithium-ion battery anode materials use carbon materials. Since the cut-off potential of carbon materials is very close to that of metal lithium, it is easy to precipitate metal lithium on the surface of carbon materials to form lithium dendrites, which can pierce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y30/00H01M4/485
CPCY02E60/10
Inventor 张校刚申来法
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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