Method for preparing lithium titanate coated aluminum lithium ion battery negative pole material

A lithium titanate-coated, lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of easy cracking and pulverization of alloys, loss of reversible lithium storage function, poor battery cycle performance, etc., to achieve Cheap preparation, stable charging and discharging voltage platform, and easy preparation

Inactive Publication Date: 2013-09-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problem faced by metal aluminum anode materials is: during the charge-discharge cycle, the reversible formation and decomposition of Li-Al alloy is accompanied by a larger volume change, which makes the alloy more prone to cracks and pulverization, and increases the contact resistance. large, resulting in irreversible capacity loss, and even loss of reversible lithium storage function, which eventually leads to electrode failure. Therefore, the cycle performance of lithium-ion batteries purely using aluminum as the negative electrode material is very poor.

Method used

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  • Method for preparing lithium titanate coated aluminum lithium ion battery negative pole material
  • Method for preparing lithium titanate coated aluminum lithium ion battery negative pole material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Preparation of lithium titanate sol

[0021] Add 10 grams of acetic acid and 15 grams of tetrabutyl titanate to 90 milliliters of ethanol in sequence, and ultrasonically disperse for 40 minutes to form A solution; add 15 grams of acetic acid to 20 milliliters of ethanol, then add 10 milliliters of deionized water and 2.6 grams of lithium acetate to form solution B; solution A was magnetically stirred at a constant temperature of 30°C for 30 minutes, solution B was added dropwise to solution A, and lithium titanate sol was obtained after stirring for 1 hour.

Embodiment 2

[0022] Example 2: Precursor preparation of lithium titanate-aluminum composite material

[0023] (1) Add 10 grams of acetic acid and 15 grams of tetrabutyl titanate to 90 milliliters of ethanol in sequence, and ultrasonically disperse for 40 minutes to form A solution; add 15 grams of acetic acid to 20 milliliters of ethanol, and then add 10 milliliters of deionized water and 2.6 g of lithium acetate to form a solution B; after stirring the solution A with a constant temperature magnetic force at 30° C. for 30 minutes, the solution B was added dropwise to the solution A to obtain a lithium titanate sol.

[0024] (2) Put the lithium titanate sol in a hydrothermal reaction kettle with a volume of 200 ml, add 5 g of spherical aluminum powder with a particle size of 1 to 5 microns, stir for 10 minutes, and seal the reaction kettle. The reaction kettle was placed in an oil bath, and the reaction kettle was taken out after 10 hours of magnetic stirring reaction at 100°C. After the ...

Embodiment 3

[0025] Example 3: Preparation of lithium titanate-aluminum composite material

[0026] (1) Take the sol obtained in Example 1 and place it in a hydrothermal reaction kettle with a volume of 200 ml.

[0027] (2) Add 50 g of spherical aluminum powder with a particle size of 5-10 microns and stir for 10 minutes; seal the reaction kettle. The reaction kettle was placed in an oil bath, and the reaction kettle was taken out after 2 hours of magnetic stirring at 300°C. After the reaction kettle is cooled to room temperature, open the reaction kettle, take out the filtered product, centrifuge and wash with water and ethanol three times in the process of "centrifugation, washing and redispersion". The lithium titanate-aluminum composite material precursor was obtained after vacuum drying at 40°C.

[0028] (3) Put the lithium titanate-aluminum composite precursor in a muffle furnace, set the calcination temperature to 500 °C under the protection of nitrogen atmosphere, and set the hea...

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Abstract

The invention relates to a battery preparation technology, and aims to provide a method for preparing a lithium titanate coated aluminum lithium ion battery negative pole material. The method comprises the following steps of: placing lithium titanate sol in a hydrothermal reaction kettle, adding spherical aluminum powder, stirring and then sealing; after the reaction, taking a reaction product out, and performing filtration, centrifugal separation and vacuum drying to obtain a lithium titanate-aluminum composite material precursor; placing the lithium titanate-aluminum composite material precursor in a muffle furnace, setting calcination temperature as 500 DEG C under the protection of a nitrogen atmosphere, and setting heating rate as 4 DEG C min<-1>; and after the set temperature is reached, preserving heat for 5 hours to obtain a lithium titanate coated aluminum composite material, namely the lithium titanate coated aluminum lithium ion battery negative pole material. According to the method, an organic electrolyte can be safely applied to a battery through a steady charge-discharge voltage platform. The lithium titanate coated aluminum lithium ion battery negative pole material is high in electrode reaction reversibility, high in chemical stability and thermal stability, low in cost, easy to prepare, and pollution-free.

Description

technical field [0001] The invention relates to a lithium ion battery material and a preparation method thereof, in particular to a preparation method of a lithium titanate-coated aluminum composite material. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. [0003] The choice of anode material has a great influence on the performance of the battery. At present, the research and development of lithium battery negative electrodes mainly focus on carbon materials and metal oxides with special structures. The most commonly used electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/46H01M4/485H01M4/62
CPCY02E60/10
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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