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Lithium ion battery anode material Li4Ti5O12/TiO2/Ag and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as few reports on composite materials research, and achieve the effects of promoting practical application, commercialization, and simple preparation methods

Active Publication Date: 2016-07-20
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is understood that for the negative electrode of lithium ion battery, about Li 4 Ti 5 o 12 / TiO 2 / Ag composites are rarely reported

Method used

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  • Lithium ion battery anode material Li4Ti5O12/TiO2/Ag and preparation method thereof
  • Lithium ion battery anode material Li4Ti5O12/TiO2/Ag and preparation method thereof
  • Lithium ion battery anode material Li4Ti5O12/TiO2/Ag and preparation method thereof

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preparation example Construction

[0021] In order to further improve the application range of lithium-ion battery negative electrode materials and the problems of complex preparation process and difficult control in the preparation method, this embodiment provides a lithium-ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 The simple preparation method of / Ag comprises the following steps:

[0022] 1) At room temperature, place tetrabutyl titanate in absolute ethanol, stir and mix thoroughly for 1 h; then CH 3 COOLi·2H 2 O was dissolved in a small amount of deionized water, and after being fully dissolved, it was added to the above solution, and reacted for 10-12 hours under dry conditions to obtain a milky white reaction solution;

[0023] 2) Put the milky white solution in an isothermal water bath at 90°C for 1 hour; then, dry it in vacuum at 70-80°C for 6-8 hours to obtain an intermediate product precursor;

[0024] 3) The product precursor is placed in the air atmosphere, calcined at 590-80...

Embodiment 1

[0036] Embodiment 1 A kind of lithium ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 / Ag intermediate product Li 4 Ti 5 o 12 / TiO 2

[0037] Follow the steps below to prepare:

[0038] 1) At room temperature, place tetrabutyl titanate in an appropriate amount of absolute ethanol, stir and mix thoroughly for 1 hour; then CH 3 COOLi·2H 2 O was dissolved in a small amount of deionized water. After fully dissolving, it was added dropwise to the above solution. Under dry conditions, it was reacted for 10-12h to obtain a milky white reaction solution (CH 3 COOLi·2H 2 O and two kinds of raw materials of tetrabutyl titanate carry out batching according to molar ratio Li / Ti=4:5~5.5);

[0039] 2) Put the above milky white reaction solution in an isothermal water bath at 90°C for 1 hour; then, vacuum-dry it at 70-80°C for 6-8 hours to obtain the intermediate product precursor;

[0040] 3) Put the intermediate product precursor in the air atmosphere, calcinate a...

Embodiment 2

[0041] Embodiment 2 A kind of lithium ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 / Ag intermediate product Li 4 Ti 5 o 12 / TiO 2

[0042] The method is the same as in Example 1, except that the calcining temperature in step 3) is changed: calcining at 690-700°C.

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Abstract

The invention provides a lithium ion battery anode material Li4Ti5O12 / TiO2 / Ag and a preparation method thereof. The invention adopts a simple method of hydrolysis assistance and further calcination to prepare a Li4Ti5O12 / TiO2 material; then a method of thermally decomposing AgNO3 to deposit metal Ag plus ultrasonic assistance is adopted to produce the target product, Li4Ti5O12 / TiO2 / Ag composite material. The preparation method provided by the invention is simple and easy to operate, the lithium ion battery anode material prepared by the method is of a nanoparticle structure, and thereby the specific surface area of the material is enlarged; moreover, under the premise of keeping the excellent properties of the spinel type Li4Ti5O12, the lithium ion battery anode material has the advantages of both TiO2 and metal Ag, and thereby the electrochemical property of the Li4Ti5O12 / TiO2 / Ag as lithium ion battery anode material is further increased.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and in particular provides a lithium ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 / Ag and its preparation method. Background technique [0002] At present, the anode materials used in high-rate lithium-ion batteries are mainly graphite-based carbon materials. The biggest problem with this type of material is that lithium dendrites are easily formed on the surface during high-current charging, which seriously affects the capacity of the material and causes Security issues. Spinel Li 4 Ti 5 o 12 (LTO) is a "zero strain" material, and this special property makes it have good reversibility in the process of lithium ion intercalation / intercalation; moreover, Li 4 Ti 5 o 12 Has a stable, high operating voltage (about 1.55V, vsLi + / Li), which can avoid the formation of lithium dendrites and the generation of SEI film, thus improving the battery safety. It is b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 葛昊崔潞霞郝婷婷陈丽宋溪明
Owner LIAONING UNIVERSITY
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