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Titanium oxide material and application thereof

A technology of titanium oxide and titanium compound, applied in the direction of titanium oxide/hydroxide, electrochemical generator, electrical components, etc., can solve the problems of unsuitable electrode materials, large irreversible capacity, low Coulombic efficiency, etc., and reach a broad market Application prospect, improvement of cycle stability, and effect of simplifying the preparation process

Inactive Publication Date: 2019-07-23
深圳市深清新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature 1 (Zhu G N, Wang C X, Xia Y Y, Journal of powersources, 2011, vol.196, No.5, 2848-2853) reported that the initial capacity of titanium oxide H2Ti3O7 and monoclinic TiO2 exceeds 300mAh / g, but A part of the lithium ions embedded in these nanomaterials in the initial intercalation reaction cannot be deintercalated, resulting in a low initial Coulombic efficiency (about 70%) and a large irreversible capacity, so it is used as a high-capacity lithium-ion secondary battery. There are defects when the anode material
Document 2 (Thomas P. Feist, Peter K. Davies, Journal of Solid State Chemistry, Vol. 101, 1992, 275–295.) reported that some titanium oxides have metastable phases during heat treatment, and it is not sure which phase A crystalline phase exists, which in turn may make it unsuitable as an electrode material

Method used

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  • Titanium oxide material and application thereof
  • Titanium oxide material and application thereof
  • Titanium oxide material and application thereof

Examples

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Effect test

Embodiment 1

[0034] Example 1 Preparation of titanium oxide material of the present invention

[0035] The preparation method of the titanium oxide nanomaterial of the present invention comprises the following steps:

[0036] 1) Take 4000ml of 0.5mol L-1 titanium sulfate solution, add 30% hydrogen peroxide, and stir thoroughly to obtain a complex solution, wherein the molar ratio of titanium sulfate:hydrogen peroxide is 1:1;

[0037] 2) adding concentrated ammonia water to the complex solution, controlling the pH value of the reaction solution to 10, and fully stirring for 10 h under the condition of a water bath at 60° C. to obtain a suspension;

[0038] 3) The suspension was subjected to a hydrothermal reaction at 120°C, and after 24 hours of heat preservation, solid-liquid separation was carried out, and the separated titanate precipitate was added to a 0.5mol L-1 HCl solution to control the pH of the reaction solution The value is 4.3, stirred for 5 hours, filtered, washed, and dried ...

Embodiment 2

[0040] Example 2 Preparation of titanium oxide nanomaterials of the present invention

[0041] The preparation method of the titanium oxide nanomaterial of the present invention comprises the following steps:

[0042] 1) Take 4000ml of 0.5mol L-1 titanium sulfate solution, add 30% hydrogen peroxide, stir well to form a complex solution, wherein the molar ratio of titanium sulfate: hydrogen peroxide is 1:2;

[0043] 2) Add 10 mol·L-1 sodium hydroxide solution to the complex solution, control the pH of the reaction solution to 11, and fully stir for 12 hours in a water bath at 70°C to obtain a suspension;

[0044] 3) The suspension was subjected to a hydrothermal reaction at 150°C, and after 36 hours of heat preservation, solid-liquid separation was performed, and the separated titanate precipitate was added to a 1mol L-1 HCl solution to control the pH of the reaction solution was 4.3, stirred for 4 hours, filtered and washed, and dried at 90°C for 10 hours to obtain a precursor,...

Embodiment 3

[0046] Example 3 Preparation of titanium oxide nanomaterials of the present invention

[0047] The preparation method of the titanium oxide nanomaterial of the present invention comprises the following steps:

[0048] 1) Take 4000ml of 0.5mol L-1 titanium sulfate solution, add ethylenediaminetetraacetic acid, stir well to form a stable complex solution, wherein the molar ratio of titanium sulfate: ethylenediaminetetraacetic acid is 1:8;

[0049] 2) Add 8 mol·L-1 potassium hydroxide to the complex solution, control the pH of the reaction solution to 10.5, and fully stir for 12 hours in a water bath at 90°C to obtain a suspension;

[0050] 3) The suspension was subjected to a hydrothermal reaction at 170°C, and after 48 hours of heat preservation, solid-liquid separation was performed, and the separated titanate precipitate was added to a 1mol L-1 HCl solution to control the pH of the reaction solution 4.3, stirred for 5h, filtered and washed, dried at 90°C for 10h to obtain a ...

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Abstract

The invention relates to a preparation method of titanium oxide. The preparation method comprises the following steps: adding a complexing agent into a titanium-containing compound solution, and stirring for uniform mixing to obtain a complex solution of a titanium-containing compound, wherein the molar ratio of the titanium-containing compound to the complexing agent is 1 to (1 to 8), preferably1 to (2 to 4); dropwise adding the complex solution of the titanium-containing compound into a water solution of an alkaline substance, controlling the pH (Potential of hydrogen) value of a reaction solution to be 10 to 11, and stirring under a water bath condition of 60 to 90 DEG C for 8 to 20 h to obtain suspension; performing a hydrothermal reaction on the suspension under 120 to 170 DEG C tillcomplete reaction, and then performing solid-liquid separation and washing to obtain titanate hydrated precipitate; adding the titanate hydrated precipitate into a water solution of an acidic substance, stirring, adjusting the pH of a reaction solution to 3 to 6, filtering and washing, and then drying under 60 to 120 DEG C to obtain a titanate precursor, wherein the molar ratio of titanate to theacidic substance is 1 to (0.5 to 2), preferably 1 to (1 to 1.5); calcining the titanate precursor under 200 to 400 DEG C for 2 to 6 h, wherein the molecular formula of the titanium oxide is preferably H2Ti7O15, and the titanium oxide has the crystal structural characteristics of a one-dimensional porous structure and a monoclinic system.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing titanium oxide and its application. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect. They have become the preferred chemical power source for high-end electronic consumer products, and have been widely used in aerospace, military, electric vehicles and other cutting-edge technology field. With the increasing market demand for lithium-ion batteries and the social needs for energy conservation and environmental protection, high-performance lithium-ion batteries have become the focus of current technology research and development in the new energy industry. [0003] At present, large-scale systematic research on lithium battery cathode materials has been formed and great progress has b...

Claims

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Application Information

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IPC IPC(8): C01G23/04H01M4/485H01M10/0525
CPCC01G23/04C01P2004/03C01P2004/10C01P2004/32C01P2006/40H01M4/485H01M10/0525Y02E60/10
Inventor 王春歌王海帆崔佳成
Owner 深圳市深清新型材料有限公司
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