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Method for preparing carbon-coated aluminum lithium battery negative pole material with core-shell structure and cavity

A core-shell structure and negative electrode material technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of easy cracking and pulverization of alloys, loss of reversible lithium storage function, irreversible capacity loss, etc., to achieve good conductivity, The effect of stable charge and discharge voltage platform and good electrode reaction reversibility

Inactive Publication Date: 2015-05-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 compared with Li-Sn alloy, which makes the alloy more prone to cracks And pulverization, the contact resistance increases, the irreversible capacity loss is formed, and even the reversible lithium storage effect is lost, which finally 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 carbon-coated aluminum lithium battery negative pole material with core-shell structure and cavity
  • Method for preparing carbon-coated aluminum lithium battery negative pole material with core-shell structure and cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of carbon-clad aluminum composite material precursor

[0035] Dissolve 2 g of glucose in 100 mL of deionized water, stir and dissolve, and then introduce it into a reactor with a total capacity of 150 mL. Then add 10 g of spherical aluminum powder with a purity of 99.99% and a particle size of 1 to 5 microns, and seal the reaction kettle after adding magnets. The reaction kettle was placed in an oil bath at 250° C., and the reaction kettle was taken out after 2 hours of magnetic stirring. After the reaction kettle is cooled to room temperature, open the reaction kettle and take out the filtered product. The product is in the form of brown or black solid powder, which is separated by centrifugation and washed with water and ethanol three times in the process of "centrifugation, washing and redispersion". The carbon-clad aluminum composite material precursor was obtained after vacuum drying at 40°C.

Embodiment 2

[0036] Example 2: Carbonization of precursors of carbon-clad aluminum composite materials

[0037] Dissolve 5 g of sucrose in 100 mL of deionized water, stir and dissolve, and then introduce it into a reactor with a total capacity of 150 mL. Then add 10 g of spherical aluminum powder with a purity of 99.99% and a particle size of 10 to 20 microns, and seal the reaction kettle after adding magnets. The reaction kettle was placed in an oil bath at 250° C., and the reaction kettle was taken out after 4 hours of magnetic stirring. After the reaction kettle is cooled to room temperature, open the reaction kettle and take out the filtered product. The product is in the form of brown or black solid powder, which is separated by centrifugation and washed with water and ethanol three times in the process of "centrifugation, washing and redispersion". The carbon-aluminum composite material precursor was obtained after vacuum drying at 40°C. The carbon-aluminum composite precursor was ...

Embodiment 3

[0038] Example 3: Preparation of Carbon-clad Aluminum Composite Material Post-treated with Hydrochloric Acid

[0039] 10 g of starch was dissolved in 100 mL of deionized water, stirred and dissolved, and introduced into a reactor with a total capacity of 150 mL. Then add 10 g of spherical aluminum powder with a purity of 99.99% and a particle size of 5 to 15 microns, and seal the reaction kettle after adding magnets. The reaction kettle was placed in an oil bath at 250° C., and the reaction kettle was taken out after 8 hours of magnetic stirring. After the reaction kettle is cooled to room temperature, open the reaction kettle and take out the filtered product. The product is in the form of brown or black solid powder, which is separated by centrifugation and washed with water and ethanol three times in the process of "centrifugation, washing and redispersion". The carbon-clad aluminum composite material precursor was obtained after vacuum drying at 40°C. The carbon-clad alu...

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Abstract

The invention relates to a lithium ion battery technology and aims to provide a method for preparing a carbon-coated aluminum lithium battery negative pole material with a core-shell structure and a cavity. The method comprises the following steps of: dissolving a carbon source material into deionized water; adding spherical aluminum powder and magnetons, and then sealing a reaction kettle; performing reaction at the temperature of 250 DEG C, and filtering to obtain brown or black solid powder; performing centrifugal separation and washing, and then performing vacuum drying to obtain a carbon aluminum composite material precursor; carbonizing at constant temperature under the protection of a nitrogen atmosphere, cooling, and post-processing through acid or alkali; and performing vacuum drying to obtain a carbon-coated aluminum composite material with the cavity in a carbon shell. The carbon-coated aluminum composite material in the core-shell structure has the characteristics of normal shape and uniform grain size; and the performance of an electrode material can be stabilized, and a product is high in quality. The carbon shell is uniform in thickness and high in conductivity, so that the electrochemical kinetics performance of a negative electrode is improved, the polarization of the electrode is reduced, and the speed capacity, reliability and safety of a lithium battery are improved.

Description

technical field [0001] The invention relates to a lithium ion battery technology, in particular to a preparation method of a carbon-coated aluminum lithium battery negative electrode material with a core-shell structure containing a cavity. 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. In 1990, Nagoura and others in Japan developed a negative electrode with petroleum coke and LiCoO 2 Lithium-ion battery as the positive electrode: LiC 6 |LiClO 4 -PC+EC|LiCoO 2 . same year. Two major battery companies, Moli and Sony, announce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/46H01M4/62
CPCY02E60/10
Inventor 李洲鹏汪倩倩刘宾虹
Owner ZHEJIANG UNIV
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