Method for preparing spinel lithium titanate of cathode material of lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in the direction of electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of poor conductivity, high cost, low specific capacity of titanium oxide compounds, etc., achieve good crystallization performance, improve conductivity, The effect of shortening the processing time

Inactive Publication Date: 2009-12-02
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of relatively low specific capacity, poor electrical conductivity and high cost of titanium oxide compound in the negative electrode material of lithium-ion batteries in the prior art, and provide a material cost and energy consumption that are low in cost and production. The obtained negative electrode material has high charge and discharge capacity and good cycle performance, and the lithium ion battery negative electrode material Li 4 Ti 5 o 12 preparation method

Method used

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  • Method for preparing spinel lithium titanate of cathode material of lithium ion battery
  • Method for preparing spinel lithium titanate of cathode material of lithium ion battery
  • Method for preparing spinel lithium titanate of cathode material of lithium ion battery

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Embodiment 1

[0050] Embodiment one: a kind of lithium-ion battery negative electrode material Li 4 Ti 5 o 12 The preparation method comprises the following steps:

[0051] (1) Weigh butyl titanate, absolute ethanol, and acetylacetone at a molar ratio of 5:9:3; after mixing the absolute ethanol and acetylacetone evenly, add butyl titanate while stirring to prepare A mixed solution of butyl titanate and ethanol; acetylacetone is used as a solvent in this reaction.

[0052] (2) According to the molar ratio of lithium hydroxide, citric acid, deionized water, absolute ethanol and butyl titanate as 3.8:2.5:5.5:5.4:5, weigh lithium hydroxide, citric acid, deionized water, and Ionized water and absolute ethanol, after mixing citric acid and absolute ethanol evenly, add lithium hydroxide to dissolve it, then add deionized water, and mix evenly; the lithium hydroxide in it is LiOH or LiOH·H 2 O can be.

[0053] (3) Slowly add the mixed solution of butyl titanate and ethanol prepared in step (1)...

Embodiment 2

[0057] Embodiment two: a kind of lithium ion battery anode material Li 4 Ti 5 C 12 The preparation method comprises the following steps:

[0058] (1) Weigh butyl titanate, absolute ethanol, and acetylacetone at a molar ratio of 5:9.5:3.8; after mixing the absolute ethanol and acetylacetone evenly, add butyl titanate while stirring to prepare Butyl titanate, ethanol mixed solution;

[0059] (2) Weigh lithium hydroxide, citric acid, deionized water, and Ionized water and absolute ethanol, after mixing citric acid and absolute ethanol evenly, add lithium hydroxide to dissolve in it, then add deionized water, and mix evenly;

[0060] (3) slowly adding the mixed solution prepared in step (1) into the solution obtained in step (2) under vigorous stirring to obtain a uniform and transparent sol precursor;

[0061] (4) Continue to stir for 40 minutes, and age for 5 hours until the sol turns into a gel;

[0062] (5) Drying by microwave at a drying temperature of 90°C and a drying...

Embodiment 3

[0064] Embodiment three: a kind of lithium-ion battery negative electrode material Li 4 Ti5 o 12 The preparation method comprises the following steps:

[0065] (1) Weigh butyl titanate, absolute ethanol, and acetylacetone at a molar ratio of 5:9.3:3.5; after mixing the absolute ethanol and acetylacetone evenly, add butyl titanate while stirring to prepare Butyl titanate and ethanol mixed solution;

[0066] (2) Weigh lithium hydroxide, citric acid, deionized water, and Ionized water and absolute ethanol, mix citric acid and absolute ethanol evenly, add lithium hydroxide to dissolve in it, and then add deionized water;

[0067] (3) slowly adding the mixed solution prepared in step (1) into the solution obtained in step (2) under vigorous stirring to obtain a uniform and transparent sol precursor;

[0068] (4) Continue to stir for 25 minutes, and age for 3 hours until the sol turns into a gel;

[0069] (5) Drying by microwave, the drying temperature is 75°C, and the drying t...

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Abstract

The invention relates to a method for preparing a cathode material Li4Ti5O12 of a high-performance lithium ion battery. The method comprises the following steps of: adopting the combined method of sol-gel and microwave treatment to prepare micro powder of nano-class Li4Ti5O12, and simultaneously modifying Li4Ti5O12 by carbon doping and metallic doping. The method utilizes the sol-gel method to effectively control chemical composition, phase composition and powder size of the Li4Ti5O12, thereby improving the uniformity and the electric conductivity of the Li4Ti5O12; simultaneously by utilizing the characteristics of the microwave technique of quick temperature rise, even heating and conglobation resistance, the high-power industrial microwave oven is used for treatment, so that the treatment time of the Li4Ti5O12 is greatly shortened, the yield is greatly improved, and the cost and the energy consumption of the material are reduced, the process is simplified, the efficiency on the industrialized production of the lithium ion battery is improved, and the industrialized application is easily achieved; and by doping carbon and metallic elements, the electric conductivity of lithium iron phosphate is greatly improved, and the charging and discharging capacities and the cycle index of the lithium iron phosphate are simultaneously and effectively increased.

Description

1. Technical field: [0001] The present invention relates to a kind of preparation method of negative electrode active material of lithium ion battery, particularly relate to a kind of high performance lithium ion battery negative electrode material Li 4 Ti 5 o 12 method of preparation. 2. Background technology: [0002] Lithium-ion batteries have the advantages of high discharge rate, wide operating temperature range, excellent cycle performance, good safety, environmental protection and no pollution. Since their inception, they have been widely used in portable electronic devices such as mobile phones, laptop computers, and small cameras. As a new generation of energy materials, lithium-ion batteries will also be widely used in electric vehicles, satellites, aerospace and military fields. Anode materials are an important part of lithium-ion batteries, research and development of high-performance anode materials has become the key to the development of lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 贾晓林刘新保张妮刘微周永刚蔡俊明李恩惠
Owner ZHENGZHOU UNIV
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