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Carbon coated metal doped lithium titanate composite material as well as preparation and application thereof

A composite material and metal doping technology, which is applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of severe microwave reaction, poor coating uniformity, and difficult control of the process, and achieve good electrochemical performance. The effect of performance, low cost and long service life

Pending Publication Date: 2019-04-23
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the modified lithium titanate material prepared by this method has been greatly improved, in actual production, the microwave chemical method has many problems such as violent reaction and difficult process control. At the same time, the method of ball milling coating has poor coating uniformity. It is difficult to form a uniform coating layer on the surface of lithium titanate material

Method used

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  • Carbon coated metal doped lithium titanate composite material as well as preparation and application thereof
  • Carbon coated metal doped lithium titanate composite material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the carbon-coated metal-doped lithium titanate composite material in this embodiment comprises the following steps:

[0036] S01, preparation of precursor: add lithium hydroxide and tetrabutyl titanate to absolute ethanol (the molar ratio of lithium ions to titanium ions is 0.82:1), and stir at 1200r / min for 30min to form a colorless transparent sol. Then add the ethanol solution of aluminum nitrate (the molar ratio of aluminum ions to lithium ions in the aluminum nitrate ethanol solution is 0.2:1), continue stirring, and then add sodium hydroxide solution (the pH value of the sodium hydroxide solution is 13), and the mixed solution Adjust the pH value to 10 and let it stand still to obtain a precipitate, which is filtered, washed, and dried to obtain a precursor;

[0037] S02, carbon-coated precursor: add the precursor prepared in S01 to the solvent, add glucose, adjust the reaction temperature to 95°C, stir at 300r / min for 30min, then let it ...

Embodiment 2

[0041] The preparation method of the carbon-coated metal-doped lithium titanate composite material in this embodiment comprises the following steps:

[0042] S01, preparation of precursor: add lithium hydroxide and tetrabutyl titanate into pure water (the molar ratio of lithium ions to titanium ions is 0.82:1), stir at 1200r / min for 30min to form a white suspension, and then add Ethanol solution of ferric nitrate (the molar ratio of iron ions to lithium ions in the ferric nitrate ethanol solution is 0.3:1), continue to stir, and then add sodium hydroxide solution (pH value of sodium hydroxide solution is 13), adjust the pH value of the mixed solution After standing still for 8 days, a precipitate was obtained, and the precipitate was filtered, washed, and dried to obtain a precursor;

[0043] S02, carbon-coated precursor: add the precursor prepared in S01 to the solvent, add polyvinyl alcohol, adjust the reaction temperature to 100°C, stir at 300r / min for 30min, let stand, and...

Embodiment 3

[0047] The preparation method of the carbon-coated metal-doped lithium titanate composite material in this embodiment comprises the following steps:

[0048] S01, preparation of precursor: add lithium hydroxide and tetrabutyl titanate into absolute ethanol (the molar ratio of lithium ion to titanium ion is 0.84:1), stir at 1200r / min for 30min, and form a colorless transparent sol. Then add an aqueous solution of cerium nitrate (the molar ratio of cerium ions to lithium ions in the aqueous cerium nitrate solution is 0.2:1), continue stirring, and then add sodium hydroxide solution (the pH value of the sodium hydroxide solution is 13), and the pH value of the mixed solution Adjust to 12 and then stand still to obtain a precipitate, which is filtered, washed, and dried to obtain a precursor;

[0049] S02, carbon-coated precursor: add the precursor prepared in S01 to the solvent, add phenolic resin, adjust the reaction temperature to 100°C, stir at 300r / min for 30min, let stand, a...

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Abstract

The invention discloses a carbon coated metal doped lithium titanate composite material as well as preparation and application thereof. According to the carbon coated metal doped lithium titanate composite material disclosed by the invention, the gas generation problem of a lithium titanate material is improved by an appropriate metal doping amount and an appropriate carbon coating amount, so thatthe electronic conductivity of the lithium titanate material is enhanced, and the advantage that the lithium titanate material has long service life is brought into full play. The invention further provides a lithium ion battery. The carbon coated metal doped lithium titanate composite material is utilized as a negative electrode material of the lithium ion battery. The lithium ion battery has good cyclic stability, and the capacity retention ratio of the lithium ion battery can be kept at 90% or more after 8000-week charge-discharge cycles under the 3 C rate.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode material development, in particular to a carbon-coated metal-doped lithium titanate composite material and its preparation, and a lithium-ion battery using the composite material as an electrode material. Background technique [0002] As a renewable energy source, lithium-ion batteries have the advantages of large capacity, long life, and environmental friendliness. They are widely used in electric vehicles and portable electronic devices. With the continuous development of new energy technologies, the performance of lithium-ion batteries has been continuously improved. Development, researchers improve the performance of lithium-ion batteries to meet consumers' requirements for lithium-ion batteries. [0003] In the development process of lithium-ion batteries, cathode materials and anode materials have always been research hotspots. In terms of cathode materials, core-shell materials...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M10/0525
CPCH01M4/364H01M4/38H01M4/485H01M10/0525H01M2004/027Y02E60/10
Inventor 刘瑞龙刘科
Owner SHENZHEN BAK POWER BATTERY CO LTD
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