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Lithium titanate/titanium dioxide nanocomposite particle with controllable composition, preparation method and application thereof

A titanium dioxide and nano-composite technology, which is applied in the direction of secondary batteries, electrochemical generators, structural parts, etc., can solve problems such as short circuit, explosion, and combustion, and achieve increased specific capacity, improved specific capacity and rate performance, and good ion The effect of transmission diffusion properties

Active Publication Date: 2019-11-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon materials still have some disadvantages as anode materials for lithium-ion batteries: the potential of carbon materials is very close to that of metal lithium. When the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode to form lithium dendrites, which cause Short circuit, there are safety hazards such as explosion and combustion
However, how to effectively combine the advantages of the two needs further research.

Method used

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  • Lithium titanate/titanium dioxide nanocomposite particle with controllable composition, preparation method and application thereof
  • Lithium titanate/titanium dioxide nanocomposite particle with controllable composition, preparation method and application thereof
  • Lithium titanate/titanium dioxide nanocomposite particle with controllable composition, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of precursor solution: Weigh 0.02mol lithium nitrate and dissolve it in 30ml ethanol, then add 0.03mol tetrabutyl titanate, then add 70ml xylene, lithium source in the system: titanium source=4:6( Mass ratio), after mixing, sonicate for 15 minutes to obtain a precursor solution, which is ready for use;

[0031] (2) Use a peristaltic injection pump to feed the precursor solution at a certain feed rate of 5ml / min to form fine atomized droplets through the atomization burner and send them into the spray combustion reactor with a shear pressure of 0.1MPa. in H 2 / O 2 (H 2 Flow 0.15m 3 / h,O 2 Flow 1m 3 / h) A series of reactions of combustion, pyrolysis, and oxidation occur under the assistance of a diffusion flame. After the flame is burned, the particles pass through a vacuum pump and are deposited on the glass fiber filter membrane of the collector to obtain a lithium titanate / titanium dioxide nanocomposite particle precursor;

[0032] (3) Calcining t...

Embodiment 2

[0034] (1) Preparation of precursor solution: Weigh 0.02mol lithium nitrate and dissolve it in 30ml ethanol, then add 0.03mol tetrabutyl titanate, then add 70ml xylene, lithium source in the system: titanium source=4:6( Mass ratio), after mixing, sonicate for 15 minutes to obtain a precursor solution, which is ready for use;

[0035](2) Use a peristaltic syringe pump to feed the precursor solution at a certain feed rate of 5ml / min to form fine atomized droplets through the atomization burner and send them into the spray combustion reactor. The shear pressure is 0.08MPa, and the atomized droplets in H 2 / O 2 (H 2 Flow 0.1m 3 / h,O 2 Flow 1m 3 / h) A series of reactions of combustion, pyrolysis, and oxidation occur under the assistance of a diffusion flame. After the flame is burned, the particles pass through a vacuum pump and are deposited on the glass fiber filter membrane of the collector to obtain a lithium titanate / titanium dioxide nanocomposite particle precursor;

[...

Embodiment 3

[0038] (1) Preparation of precursor solution: Weigh 0.03mol lithium nitrate and dissolve it in 30ml ethanol, then add 0.02mol tetrabutyl titanate, then add 70ml xylene, lithium source in the system: titanium source = 6:4( Mass ratio), after mixing, sonicate for 20 minutes to obtain a precursor solution, which is ready for use;

[0039] (2) Use a peristaltic injection pump to feed the precursor solution at a certain feed rate of 6ml / min to form fine atomized droplets through the atomization burner and send them into the spray combustion reactor. The shear pressure is 0.12MPa, and the atomized droplets in H 2 / O 2 (H 2 Flow 0.1m 3 / h,O 2 Flow 1m 3 / h) A series of reactions of combustion, pyrolysis, and oxidation occur under the assistance of a diffusion flame. After the flame is burned, the particles pass through a vacuum pump and are deposited on the glass fiber filter membrane of the collector to obtain a lithium titanate / titanium dioxide nanocomposite particle precursor;...

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Abstract

The invention relates to the field of new energy materials, in particular to a lithium ion battery anode material and a preparation method and application thereof. A composition-controllable lithium titanate / titanium dioxide nanometer composite particle is characterized in that in a precursor for preparing the lithium titanate / titanium dioxide nanometer composite particle, lithium titanate is a mixing phase of Li4Ti5O12 and Li2TiO3, and the titanium dioxide is a mixing phase of anatase and rutile; the particle size of the composition-controllable lithium titanate / titanium dioxide nanometer composite particle is 10 to 40nm, and is of a chain-shaped structure. The composition-controllable lithium titanate / titanium dioxide nanometer composite particle has the advantages that the synergistic action of the lithium titanate and the titanium dioxide is realized, the rate capability of the composite material is guaranteed by the lithium titanate, the specific capacity of the material is improved by the titanium dioxide, and the titanium dioxide and the lithium titanate form a particle interface to provide an additional lithium storage space; the high rating capability and high electrochemical activity of the material are guaranteed, and the considerable prospect is realized in the lithium ion battery anode material.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a negative electrode material for a lithium ion battery and a preparation method and application thereof. Background technique [0002] Most of the current commercial lithium-ion battery anode materials use lithium-intercalated carbon materials. However, carbon materials still have some disadvantages as anode materials for lithium-ion batteries: the potential of carbon materials is very close to that of metal lithium. When the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode to form lithium dendrites, which cause Short circuit, there are potential safety hazards such as explosion and combustion. Li 4 Ti 5 o 12 It has very good structure retention performance and is called "zero strain" material: no structural change occurs during charging and discharging, and the cycle performance is good; it has great advantages in fast charging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/48H01M10/0525
CPCH01M4/362H01M4/483H01M4/485H01M10/0525Y02E60/10
Inventor 胡彦杰江浩谢飞赵醒李春忠
Owner EAST CHINA UNIV OF SCI & TECH
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