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Nano lithium titanate-graphene composite material and preparation method therefor

A composite technology of nano-lithium titanate and graphene, which is applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the complex synthesis process, limit the wide application of composite materials, and is difficult to achieve large-scale production. and other problems, to achieve the effect of simple process, excellent electrochemical performance, and easy industrial production.

Active Publication Date: 2017-02-01
温州弘德仪器科技有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the need to add a large number of precursor reaction sources in the preparation process, the synthesis process is complicated, and it produces different levels of pollutants. Therefore, it is difficult to achieve large-scale production, which also limits the wide application of composite materials.

Method used

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  • Nano lithium titanate-graphene composite material and preparation method therefor
  • Nano lithium titanate-graphene composite material and preparation method therefor

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preparation example Construction

[0028] Please refer to figure 1 , the embodiment of the present invention provides a preparation method of nano-lithium titanate-graphene composite material, comprising the following steps:

[0029] (1) Preparation of nano-lithium titanate: uniformly mix titanium dioxide and lithium source according to the molar ratio of lithium to titanium of 0.8 to 0.9:1, and perform wet ball milling for 1 to 48 hours. Calcined at 500-1100°C for 1-36 hours in a neutral atmosphere to obtain micron lithium titanate powder, then put the micron lithium titanate powder into a grinder, and wet ball mill at a speed of 800-12000 rpm 30 to 240 minutes, after drying, nano lithium titanate powder is obtained;

[0030] (2) Preparation of graphene dispersion liquid: disperse graphene in solvent, and add a certain amount of dispersant, open Microfluidizer M-110L high-pressure micro-jet homogenizer, adjust pressure to be 400-10000 pounds / square inch PSI, in The basis of the emulsification of the dispersant...

Embodiment 1

[0038] The preparation process of nano-lithium titanate-graphene follows the process flow figure 1 conduct. First prepare the nano-lithium titanate material, choose lithium carbonate as the lithium source, mix lithium carbonate and titanium dioxide uniformly according to the molar ratio of lithium to titanium 0.82:1, add absolute ethanol and ball mill, and control the solid content at 35wt%, on the planetary ball mill Ball milling at a speed of 400 rpm for 12 hours to obtain a lithium titanate precursor mixture. After drying at 120°C, it was calcined at 800°C for 12 hours under an argon atmosphere, cooled at room temperature to below 100°C, and taken out to obtain micron lithium titanate. Put the above-mentioned micron lithium titanate powder into a high-energy ball mill, add absolute ethanol for ball milling, control the solid content to 30wt%, ball mill at a speed of 2000 rpm for 120 minutes, and then dry the ball mill tank at 120°C to obtain nanometer lithium titanate . ...

Embodiment 2

[0045] Nanoscale lithium titanate was prepared in the same manner as in Example 1.

[0046] The difference from Example 1 is that the graphene content in the composite material is controlled at 1 wt%, and the lithium titanate is about 99 wt% in the total weight of the composite material. The prepared composite material dispersion was rotary evaporated to obtain composite material powder.

[0047] The obtained composite material powder was calcined in an argon atmosphere, the temperature was adjusted to 400° C., kept for 20 hours, and naturally cooled to room temperature to obtain a nano-lithium titanate-graphene composite material.

[0048] Electrochemical tests were carried out on the prepared composite material, and the mixture ratio of the pole piece smear was: composite material: conductive carbon black: PVDF=60:30:10. After testing, the battery shows excellent cycle stability. At 1C rate, the ultra-high specific capacity reaches 165mAh / g; at 10C rate, the specific capaci...

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Abstract

The invention discloses a nano lithium titanate-graphene composite material and a preparation method therefor. A graphene material is prepared into a graphene super-dispersion liquid firstly; ball-milled super-lithium titanate nano powder is mixed through a high-voltage micro-jet-flow technology to obtain the nano lithium titanate-graphene composite material; and next, a step of spraying and drying is performed to prepare the spherical lithium titanate-graphene composite material. The invention also relates to the nano lithium titanate-graphene composite material prepared by the abovementioned preparation method.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a nanometer lithium titanate-graphene composite material and a preparation method thereof. Background technique [0002] With the gradual depletion of fossil energy such as oil and natural gas and the increasing global environmental pollution and climate warming, energy-saving and clean energy vehicles (electric vehicles, gasoline-electric hybrid vehicles and fuel cell vehicles, etc.) With the rapid development, the demand for power batteries as its core has also increased sharply. Lithium-ion batteries are widely used in mobile communications, digital cameras, laptops and other portable electronic devices, as well as power tools, drones, electric scooters, military fields such as defense and aerospace. When it is used as a power source for electric vehicles, it also needs to have high capacity, high power, long life, wide temperature adapta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 彭成信
Owner 温州弘德仪器科技有限公司
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