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Spherical porous lithium titanate/titanium dioxide composite material as well as preparation method and application of composite material

A technology of titanium dioxide and porous lithium titanate, applied in electrode manufacturing, electrical components, battery electrodes, etc., to achieve high specific capacity, simple preparation method, and low equipment requirements

Active Publication Date: 2015-05-13
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, after investigating relevant literature, we found that the electrochemical performance of lithium titanate / titanium dioxide composite materials is better than that of pure phase lithium titanate materials, and has a higher specific capacity. Spherical porous structure lithium titanate / titanium dioxide composite materials have not yet see the report

Method used

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  • Spherical porous lithium titanate/titanium dioxide composite material as well as preparation method and application of composite material
  • Spherical porous lithium titanate/titanium dioxide composite material as well as preparation method and application of composite material
  • Spherical porous lithium titanate/titanium dioxide composite material as well as preparation method and application of composite material

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Embodiment 1

[0024] A spherical porous lithium titanate / titanium dioxide composite material is a spherical porous structure with a size of 0.2-1 micron and a pore diameter of 15-20 nanometers.

[0025] A preparation method of a spherical porous lithium titanate / titanium dioxide composite material, comprising the following steps:

[0026] (1), weigh 0.1544 grams of LiNO 3 and 0.25 g of P123 were dissolved in 20 mL of ethanol solution, and then 0.5 mL of glacial acetic acid solution and 1 mL of tetrabutyl titanate (TBOT) solution were added to the resulting solution, and mixed evenly under ultrasonication;

[0027] (2) Atomize the mixed solution of reactants obtained in step (1) in an atomizer, and at the same time, in a vacuum atmosphere, under the drainage of a vacuum pump, the mist is introduced into a high-temperature furnace through a glass conduit, and passed through a high-temperature furnace at 480 ° C. Dry and decompose to obtain a solid product that is a spherical precursor;

[0...

Embodiment 2

[0031] A spherical porous lithium titanate / titanium dioxide composite material is a spherical porous structure with a size of 0.2-1 micron and a pore diameter of 15-20 nanometers.

[0032] A preparation method of a spherical porous lithium titanate / titanium dioxide composite material, comprising the following steps:

[0033] (1), weigh 0.0193 grams of LiNO 3 Dissolve 0.032 g of F127 in 20 mL of ethanol solution, then add 0.5 mL of glacial acetic acid solution and 0.9 mL of TBOT solution to the resulting solution, and mix well under ultrasonic;

[0034] (2), atomize the solution obtained in step (1) with an atomizer, dry and decompose it in a high-temperature furnace (furnace temperature 480° C.), and finally collect powder particles;

[0035] (3) Calcining the collected powder in air at 600° C. for 8 hours with a heating rate of 5° C. / min.

[0036] An application of a spherical porous lithium titanate / titanium dioxide composite material as an electrode material.

Embodiment 3

[0038] A spherical porous lithium titanate / titanium dioxide composite material is a spherical porous structure with a size of 0.2-1 micron and a pore diameter of 15-20 nanometers.

[0039] A preparation method of a spherical porous lithium titanate / titanium dioxide composite material, comprising the following steps:

[0040] (1), weigh 0.0965 grams of LiNO 3 Dissolve 0.10 g of P123 in 20 mL of ethanol solution, then add 0.5 mL of glacial acetic acid solution and 1 mL of TBOT solution to the resulting solution, and mix well under ultrasonication;

[0041] (2), atomize the solution obtained in step (1) with an atomizer, dry and decompose it in a high-temperature furnace (furnace temperature 480° C.), and finally collect powder particles;

[0042] (3) Calcining the collected powder in air at 600° C. for 8 hours with a heating rate of 5° C. / min.

[0043] An application of a spherical porous lithium titanate / titanium dioxide composite material as an electrode material.

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Abstract

The invention provides a spherical porous lithium titanate / titanium dioxide composite material as well as a preparation method and application of compositematerial. The preparation method comprises the following steps: dissolving a lithium source and a surfactant in anhydrous alcohol, then adding glacial acetic acid and a titanium source inside, mixing uniformly, subsequently atomizing, drying and decomposing to obtain a body; and subsequently calcining at high temperature to obtain the porous spherical lithium titanate / titanium dioxide composite material. Compared with the prior art, the spherical porous lithium titanate / titanium dioxide composite prepared according to the preparation method has the size of 0.2-1 microns and pore size of 15-20 nanometers, has a uniform and perfect spherical shape, and is beneficial totapping and compacting, is of a porous structure is beneficial to the permeation and diffusion of electrolytes andsimultaneously facilitates transferring of lithium ions, and the subsequent screening is not needed due to the size of 0.2-1 microns; moreover, according to the preparation method disclosed by the invention,the requirements on equipment is low, and presintering and mixing are not needed, and the common high-temperature furnace can produce the composite material; and being as an electrode material, the composite material disclosed by the invention has relatively high special capacity reaching 166 mAh / g under 1C rate.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a spherical porous lithium titanate / titanium dioxide composite material, a preparation method and an application thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have attracted increasing attention based on their own advantages, including high energy density, long cycle life, good stability, and no memory effect. Lithium-ion batteries have been widely used in mobile phones, Notebook computers, electric vehicles and other portable electronic products. In recent years, due to people's growing awareness of environmental protection, the application of lithium-ion batteries has also been extended to pure power vehicles and hybrid vehicles. [0003] At present, commercial lithium-ion battery anode materials mainly use carbon-based materials. Although carbon materials are cheap and non-toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/131H01M4/04
CPCY02E60/10
Inventor 耿保友汪青
Owner ANHUI NORMAL UNIV
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