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

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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 capacit

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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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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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