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Preparation method of silicon-based anode material for lithium ion battery

A silicon-based negative electrode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited battery cycle and rate performance, and achieve improved ion permeability, rate performance, and particle size. control effect

Active Publication Date: 2016-01-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above method solves the problem of silicon volume expansion and poor conductivity to a certain extent, it sacrifices a certain proportion of battery capacity, and the improvement of battery cycle and rate performance is still limited. Therefore, how to further improve the structure of silicon materials to alleviate The effect of volume expansion on its cycle performance and the increase of the conductivity of the coating layer to improve its rate performance are of great significance to the research of lithium-ion battery anode materials

Method used

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  • Preparation method of silicon-based anode material for lithium ion battery
  • Preparation method of silicon-based anode material for lithium ion battery
  • Preparation method of silicon-based anode material for lithium ion battery

Examples

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Embodiment 1

[0032] The preparation method of the lithium-ion battery silicon-based negative electrode material of the present embodiment comprises the following steps:

[0033] (1) Add 0.3g of nano-alumina to 100mL of ethanol aqueous solution (volume fraction of ethanol is 50%) for stirring and dispersing, add 20mL of concentrated ammonia water to the suspension, continue stirring until the mixture is uniform, and then add 4mL of orthosilicone dropwise A mixed solution of ethyl acetate and 16 mL of ethanol was stirred continuously during the dropwise addition until the reaction was completed, and the resulting product was subsequently centrifuged, and the solid product obtained after centrifugation was washed with deionized water and dried under vacuum to obtain Al 2 o 3 SiO 2 solid;

[0034] (2) Add 0.8gAl 2 o 3 SiO 2 The solid is ground and mixed with 1g of magnesium powder evenly, and placed in a tube furnace to heat up to 650°C for 3 hours under an argon protective atmosphere to ...

Embodiment 2

[0039] The preparation method of the lithium-ion battery silicon-based negative electrode material of the present embodiment comprises the following steps:

[0040] (1) Add 0.3g of nano-alumina to 100mL of ethanol aqueous solution (volume fraction of ethanol is 50%) for stirring and dispersing, add 20mL of concentrated ammonia water to the suspension, continue to stir until the mixture is uniform, and then add 3mL of orthosilicone dropwise The mixed solution of ethyl acetate and 12mL ethanol was continuously stirred during the dropwise addition until the reaction was completed, and the resulting product was then centrifuged, and the solid product obtained after centrifugation was washed with deionized water and dried under vacuum to obtain Al 2 o 3 SiO 2 solid;

[0041] (2) Add 0.9gAl 2 o 3 SiO 2 The solid is ground and mixed with 1g of magnesium powder evenly, and placed in a tube furnace to heat up to 650°C for 3 hours under an argon protective atmosphere to obtain a so...

Embodiment 3

[0047] The preparation method of the lithium-ion battery silicon-based negative electrode material of the present embodiment comprises the following steps:

[0048] (1) Add 0.2g of nano-alumina to 100mL of ethanol aqueous solution (volume fraction of ethanol is 50%) for stirring and dispersing, add 20mL of concentrated ammonia water to the suspension, continue stirring until the mixture is uniform, and then add 2mL of orthosilicone dropwise A mixed solution of ethyl acetate and 10 mL of ethanol was continuously stirred during the dropwise addition until the reaction was completed, and the resulting product was subsequently centrifuged, and the solid product obtained after centrifugation was washed with deionized water and dried under vacuum to obtain Al 2 o 3 SiO 2 solid;

[0049] (2) Add 0.6gAl 2 o 3 SiO 2 The solid and 0.7g of magnesium powder were ground and mixed evenly, and placed in a tube furnace to heat up to 650°C for 3 hours under an argon protective atmosphere ...

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Abstract

The invention discloses a preparation method of a silicon-based anode material for a lithium ion battery. The preparation method comprises the following steps of using tetraethyl orthosilicate as a silicon source and nanometer aluminum oxide as a template agent to prepare a silicon dioxide coated nanometer aluminum oxide material, and then carrying out magnesiothermic reduction and acid treatment to obtain hollow porous silicon; coating the surface of the hollow porous silicon with a layer of polydopamine by means of self-polymerization of dopamine; and carrying out thermal treatment to prepare hollow porous silicon coated with a polydopamine pyrolytic carbon layer, namely the silicon-based anode material for the lithium ion battery. A porous silicon hollow structure can be used for providing a certain expansion space for volume changes during the charging and discharging process of silicon, a nitrogen-doped carbon layer formed after thermal treatment on the polydopamine has higher mechanical property and electrical conductivity than conventional carbon layers, thus, the silicon-based anode material disclosed by the invention has favorable cycle performance and rate performance, and the retention rate of the charge specific capacity of the silicon-based anode material is still kept 90% after 50 times of cycling.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a method for preparing a silicon-carbon composite material for lithium ion batteries. Background technique [0002] Lithium-ion batteries have a series of advantages such as high energy density, stable working voltage, and long service life, and have been widely used in portable devices. As one of the important components of lithium-ion batteries, anode materials have become the focus of research in various countries. The trend of miniaturization, high energy, and portability of electronic appliances, the research and development of electric vehicles, and the demand for national defense equipment have put forward higher requirements for the energy density of lithium ions. At present, the graphite anode material that has been commercialized has a low lithium storage capacity, and the theoretical specific capacity is only 372mAh / g, which has gr...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 郭华军周融李新海王志兴杨阳胡启阳周玉
Owner CENT SOUTH UNIV
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