Lithium titanate-carbon nanotube composite material, preparation method thereof and lithium ion battery

A technology of carbon nanotubes and composite materials, which is applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of difficulty in ensuring material consistency, unstable electrochemical performance, and complicated preparation processes, and achieve improved conductivity and small size. Good effect of distribution and composite uniformity

Inactive Publication Date: 2018-08-24
桑德新能源技术开发有限公司 +1
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  • Abstract
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Problems solved by technology

[0006] In order to solve the problems of the existing carbon-coated lithium titanate composite materials such as complex preparation process, poor composite uniformity, difficulty in ensuring material consistency, and unstable electrochemical performance, the present invention provides a simple preparation method with good composite uniformity. , Lithium titanate carbon nanocomposite material with high material consistency and high degree of nanometerization to effectively improve the conductivity of lithium titanate material, the method is simple and the reaction process is easy to control, suitable for large-scale production and application

Method used

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  • Lithium titanate-carbon nanotube composite material, preparation method thereof and lithium ion battery
  • Lithium titanate-carbon nanotube composite material, preparation method thereof and lithium ion battery
  • Lithium titanate-carbon nanotube composite material, preparation method thereof and lithium ion battery

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preparation example Construction

[0046] A preferred embodiment of the synthetic method of the present invention, such as figure 1 shown, including steps:

[0047] S1: Take a certain amount of carbon nanotubes and add them to the oxidizing acid solution, heat treatment, then condense and reflux, and dry to obtain acid-treated carbon nanotubes;

[0048] S2: adding a certain amount of organic titanium source into anhydrous liquid alcohol to prepare an organic titanium alcohol solution, adding a certain amount of carbon nanotube material to the aforementioned organic titanium alcohol solution, and performing a homogenization operation, The first solution is obtained; the organic titanium source is an organic acid of titanium or an organic alcohol of titanium, preferably isopropyl titanate, tetrabutyl titanate, tetraisopropyl titanate, ethyl titanate or n-butyl titanate ; The organic titanium source can be formulated into a 0.15-0.2 mol / L anhydrous alcohol solution; preferably a 0.15-0.18 mol / L anhydrous alcohol ...

experiment example 1

[0059] Experimental example 1: Synthesis of lithium titanate / carbon nanotube composite material (titanium source: isopropyl titanate):

[0060] (1) Get 0.200g of carbon nanotubes and add to the mixed solution of 50ml concentrated nitric acid and concentrated sulfuric acid (V H2SO4 :V (HNO3) =1:1), heat treatment, then condensed to reflux, and freeze-dried to obtain acid-treated carbon nanotubes.

[0061] (2) Add 0.05mol isopropyl titanate dropwise to 300mL of absolute ethanol with magnetic stirring to obtain mixed solution A 1 , and then the above acid-treated carbon nanotubes (diameter 30nm) were added to the above A 1 solution, and then placed in a high-power ultrasonic instrument for ultrasonic homogenization for 3 hours to obtain the first solution;

[0062] (3) 0.0405mol of CH 3 COOLi·2H 2 O was dissolved in 100 mL of absolute ethanol to obtain B 1 solution (for the second solution), under strong magnetic stirring, the B 1 The solution was slowly added dropwise to ...

experiment example 2

[0065] Experimental example 2: Synthesis of lithium titanate / carbon nanotube composite material (titanium source: n-butyl titanate):

[0066] (1) Add 0.200 g of carbon nanotubes to 50 ml of concentrated sulfuric acid solution, heat treatment, then condense and reflux, and freeze-dry to obtain acid-treated carbon nanotubes;

[0067] (2) 0.0398mol of CH 3 COOLi·2H 2 O was dissolved in 100mL absolute ethanol to obtain mixed solution A 1 , and then the above acid-treated carbon nanotubes (diameter 20nm) were added to the above-mentioned A 1 solution, and then placed in a high-power ultrasonic instrument for ultrasonic homogenization for 3 hours to obtain the first solution;

[0068] (3) Add 0.05mol n-butyl titanate dropwise to 300mL ethanol with magnetic stirring to obtain B 1 solution (for the second solution), under strong magnetic stirring, the B 1 The solution was slowly added dropwise to the first solution, and stirring was continued for 2 h at room temperature;

[0069] ...

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Abstract

The invention relates to a preparation method of a lithium titanate-carbon nanotube composite material. The preparation method comprises the steps of precursor preparation, in which a carbon nanotube,an organic titanium source and a lithium source are placed in a solvent system with hydroalcohol for reaction to obtain the precursor of the lithium titanate-carbon nanotube composite material; and calcination, in which the precursor is calcinated to obtain the lithium titanate-carbon nanotube composite material. In the composite material prepared by the method, lithium titanate is a in uniform particle shape, the lithium titanate-carbon nanotube composite material is better in combination uniformity, small in lithium titanate particle and is used as a lithium ion battery negative electrode material, the material conductivity can be obviously improved, and excellent large-rate conductivity and electrochemical cycle stability are shown. The invention also provides the lithium titanate-carbon nanotube composite material and a lithium battery fabricated by employing the material.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a lithium titanate-carbon nanotube composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, no memory effect, and no pollution to the environment. They have been widely used in portable electronic devices and power vehicles. At present, the most widely used negative electrode material for commercial lithium-ion batteries is graphite. However, during the charging and discharging process, the graphite negative electrode has a low voltage platform, and lithium dendrites are easily formed on the surface of the negative electrode during the lithium deintercalation process, which will puncture the battery separator, resulting in serious safety hazards such as short circuit. The safety issue is the key issue that needs to be solved urgently for lithium-ion batter...

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
CPCB82Y30/00H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 靳岩李扬娄忠良
Owner 桑德新能源技术开发有限公司
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