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A kind of lithium titanate electrode material with composite pore structure and preparation method thereof

An electrode material and composite hole technology, applied in structural parts, battery electrodes, circuits, etc., can solve problems such as no discovery, and achieve the effects of improving tap density, reducing diffusion distance, and enriching pore structures.

Active Publication Date: 2020-02-18
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution is to further improve the overall performance of the final product lithium titanate by changing the structure of the lithium titanate material. At present, no patented method for preparing lithium titanate similar to this technical solution has been found.

Method used

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  • A kind of lithium titanate electrode material with composite pore structure and preparation method thereof

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Effect test

Embodiment 1

[0021] A kind of lithium titanate electrode material with composite pore structure, its preparation method comprises the following steps:

[0022] (1) Tetraethylammonium hydroxide solution, ammoniacal liquor and water are mixed uniformly, wherein the volume ratio of tetraethylammonium hydroxide solution, ammoniacal liquor and water is 1:5:10;

[0023] (2) Then add titanyl sulfate solution dropwise, stir for 6 hours, add polyvinyl alcohol, continue stirring for 4 hours, wherein, the volume ratio of titanyl sulfate solution and tetraethylammonium hydroxide is 14:1, polyvinyl alcohol and The volume ratio of tetraethylammonium hydroxide is 0.8:1;

[0024] (3) Put the above solution into the reaction kettle, let it stand at 120°C for 6 hours, cool to room temperature, filter, wash the precipitate with absolute ethanol until there are no sulfate groups, dry it, and calcinate at 550°C After 3 hours, cool to room temperature to obtain titanium dioxide powder with composite pore struc...

Embodiment 2

[0029] A kind of lithium titanate electrode material with composite pore structure, its preparation method comprises the following steps:

[0030] (1) Tetraethylammonium hydroxide solution, ammoniacal liquor and water are mixed uniformly, wherein the volume ratio of tetraethylammonium hydroxide solution, ammoniacal liquor and water is 1:3:15;

[0031] (2) Then add titanyl sulfate solution dropwise, stir for 3 hours, add polyvinyl alcohol, continue to stir for 8 hours, wherein, the volume ratio of titanyl sulfate solution and tetraethylammonium hydroxide is 12:1, polyvinyl alcohol and The volume ratio of tetraethylammonium hydroxide is 1.2:1;

[0032] (3) Put the above solution into the reaction kettle, let it stand at 100°C for 8 hours, cool to room temperature, filter, wash the precipitate with absolute ethanol until there are no sulfate groups, dry it, and calcinate at 420°C After 5 hours, cool to room temperature to obtain titanium dioxide powder with composite pore struct...

Embodiment 3

[0037] A kind of lithium titanate electrode material with composite pore structure, its preparation method comprises the following steps:

[0038] (1) Tetraethylammonium hydroxide solution, ammoniacal liquor and water are mixed uniformly, wherein the volume ratio of tetraethylammonium hydroxide solution, ammoniacal liquor and water is 1:4:12;

[0039] (2) Then add titanyl sulfate solution dropwise, stir for 5 hours, add polyvinyl alcohol, continue stirring for 6 hours, wherein, the volume ratio of titanyl sulfate solution and tetraethylammonium hydroxide is 13:1, polyvinyl alcohol and The volume ratio of tetraethylammonium hydroxide is 1:1;

[0040] (3) Put the above solution into the reaction kettle, let it stand at 110°C for 7 hours, cool to room temperature, filter, wash the precipitate with absolute ethanol until there are no sulfate groups, dry it, and calcinate at 500°C After 4 hours, cool to room temperature to obtain titanium dioxide powder with composite pore structu...

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Abstract

The invention belongs to the technical field of electrode materials and particularly relates to a lithium titanate electrode material with a composite hole structure and a preparation method of the lithium titanate electrode material. The method includes the steps that firstly, titanium dioxide with a composite hole structure is prepared through a double template system method, and then titanium dioxide and a lithium source are prepared into the material through a solid phase synthesis method. According to the lithium titanate electrode material with the composite hole structure prepared through the method, the first-time charge-discharge specific capacity is 173.4 mAh / g and is 99.1% of the theoretical specific capacity of a lithium titanate material, and the tap density can reach 1.05-1.15 g / cm<3>.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a lithium titanate electrode material with a composite pore structure and a preparation method thereof. Background technique [0002] Compared with commercial lithium-ion battery negative electrode carbon materials, lithium titanate Li4Ti5O12 with a spinel structure has a cubic structure and "zero strain" performance, and has good kinetic properties and stability; the activity of reacting with the electrolyte is small , it is not easy to form an impedance layer; the high specific surface area has the dynamic characteristics of fast charging; no SEI film is formed, and it has the advantages of good thermal stability and safety characteristics. However, the material itself has a low electrical conductivity (about 10-9S / cm), which can significantly increase the internal resistance and mass transfer resistance of the battery during the charge and discharge pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485
CPCH01M4/485H01M2004/021Y02E60/10
Inventor 魏爱佳李文刘振法张利辉李晓辉
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI