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Preparation method of lithium titanate material

A technology of lithium titanate and lithium acetate, applied in titanate, alkali metal titanate, chemical instruments and methods, etc., can solve problems such as poor electrical conductivity, and achieve the effect of improving electrical conductivity and improving mobility

Active Publication Date: 2020-05-08
江苏众钠能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art, the present invention provides a preparation method of lithium titanate material, which solves the problem of poor conductivity of the existing lithium titanate material, uses titanium monoxide as the inner core, and uses lithium titanate as the surface coating layer , to ensure that the prepared material has oxygen deficiency, improve the mobility of electrons, and thus improve the conductivity

Method used

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Examples

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preparation example Construction

[0024] A preparation method of lithium titanate material, comprising the steps of:

[0025] Step 1, adding tetrabutyl titanate into absolute ethanol and stirring evenly to form a titanium alcohol solution;

[0026] Step 2, adding lithium acetate to the titanic acid solution and stirring evenly to form a mixed solution;

[0027] Step 3, adding titanium monoxide powder to the mixed solution and ultrasonically ultrasonicating at low temperature for 1-2 hours to obtain a suspension;

[0028] Step 4, spray the suspension into a constant temperature reaction kettle, seal and deposit, release pressure and cool to obtain coated titanium monoxide particles;

[0029] Step 5, put the coated titanium monoxide particles into a sealed reaction kettle and let it stand at constant pressure for 1-3 hours, then pass in water vapor for a sealed pressurized reaction for 2-3 hours, and seal and sinter to obtain lithium titanate particles after pressure release.

[0030] The concentration of n-bu...

Embodiment 1

[0041] A preparation method of lithium titanate material, comprising the steps of:

[0042] Step 1, adding tetrabutyl titanate to absolute ethanol and stirring evenly to form a titanium alcohol solution; the concentration of n-butyl titanate in absolute ethanol is 100g / L, and the stirring speed is 1000r / m;

[0043] Step 2, adding lithium acetate into the titanic acid solution and stirring evenly to form a mixed solution; the amount of lithium acetate added is 110% of the molar weight of n-butyl titanate, and the stirring speed is 1500r / min;

[0044] Step 3: Add titanium monoxide powder to the mixed solution for low-temperature ultrasonication for 1 hour to obtain a suspension; titanium monoxide powder is a micron-sized powder with a particle size of 10 μm; low-temperature ultrasonication adopts high-frequency gap ultrasonication, and the low temperature is 5°C , the ultrasonic frequency is 60kHz, the single ultrasonic time is 5s, and the ultrasonic interval is 10s;

[0045] S...

Embodiment 2

[0049] A preparation method of lithium titanate material, comprising the steps of:

[0050] Step 1, adding tetrabutyl titanate to absolute ethanol and stirring evenly to form a titanium alcohol solution; the concentration of n-butyl titanate in absolute ethanol is 200g / L, and the stirring speed is 2000r / m;

[0051] Step 2, adding lithium acetate to the titanic acid solution and stirring evenly to form a mixed solution; the amount of lithium acetate added is 140% of the molar weight of n-butyl titanate, and the stirring speed is 2500r / min;

[0052] Step 3: Add titanium monoxide powder to the mixed solution for low-temperature ultrasonication for 2 hours to obtain a suspension; titanium monoxide powder is a micron-sized powder with a particle size of 500 μm; low-temperature ultrasonication adopts high-frequency gap ultrasonication, and the low temperature is 10°C , the ultrasonic frequency is 90kHz, the single ultrasonic time is 10s, and the ultrasonic interval is 20s;

[0053]...

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Abstract

The invention belongs to a lithium battery material, and concretely relates to a preparation method of a lithium titanate material. The method comprises the following steps: 1, adding tetrabutyl titanate into anhydrous ethanol, and uniformly stirring to form a titanium alcohol solution; 2, adding lithium acetate into the titanium alcohol solution, and uniformly stirring to form a mixed solution; 3, adding titanium monoxide powder into the mixed solution, and carrying out low-temperature ultrasonic treatment for 1-2 h to obtain a suspension; 4, spraying the suspension into a constant-temperature reaction kettle, sealing, depositing, decompressing and cooling to obtain coated titanium monoxide particles; and 5, putting the coated titanium monoxide particles into the sealed reaction kettle, carrying out constant-pressure standing for 1-3 h, then introducing water vapor, carrying out a sealed pressurization reaction for 2-3 h, relieving the pressure, and carrying out sealed sintering so asto obtain lithium titanate particles. The problem that an existing lithium titanate material is poor in electrical conductivity is solved; and titanium monoxide is used as an inner core, and lithiumtitanate is used as a surface coating layer, so it is guaranteed that the prepared material has oxygen deficiency, the mobility of electrons is improved, and the electrical conductivity is improved.

Description

technical field [0001] The invention belongs to lithium battery materials, and in particular relates to a preparation method of lithium titanate material. Background technique [0002] Lithium titanate "zero-strain material" is being increasingly used in lithium-ion batteries due to its superior cycle performance, good rate and reliable safety. Lithium titanate has a three-dimensional lithium ion diffusion channel unique to the spinel structure, Li + The diffusion coefficient is 2*10 -8 cm 2 / S, which is more than 10 times that of graphite, makes it have obvious advantages of fast charging and good high and low temperature performance; in addition, it has good safety, long life, and environmental protection, making it suitable for electric buses, energy storage, and high-power Equipment and other fields have broad application space. Especially in the field of energy storage, with the continuous deepening of my country's power system reform and the rise of the energy Inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00
CPCC01G23/005
Inventor 赵建庆
Owner 江苏众钠能源科技有限公司
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