Preparation method of multiple composite anode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability, unsuitable for commercial applications, unfavorable buffer silicon volume expansion, etc., to achieve good cycle life, heavy The effect of high availability and lower actual cost

Active Publication Date: 2014-01-29
MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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Problems solved by technology

[0004] The existing preparation methods of silicon-based negative electrode materials mainly use carbon sources (such as sucrose, pitch, etc.) to compound silicon with silicon under ball milling, and then use carbonization and sintering to obtain silicon-carbon composite materials. Simultaneously wi

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  • Preparation method of multiple composite anode material of lithium ion battery

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Embodiment 1

[0019] Take 0.3mol of silicon powder, 0.1mol of silicon monoxide and 0.1mol of sucrose for ball milling and mixing, then under the protection of a mixed gas of hydrogen and argon with a volume ratio of 1:20, the temperature is raised to 800°C at a rate of 2°C per minute, Carbonized and sintered at 800°C for 5 hours, cooled naturally to room temperature, and ball milled for 10 minutes to obtain a preliminary sample of silicon / silicon monoxide / carbon multiple composite structure. Disperse 10 g of the sample obtained above into 100 ml of a mixed solution of ethyl orthosilicate and ethanol, wherein the volume ratio of ethyl orthosilicate to ethanol is 1:4, stir and mix for 1 hour, then add excess distilled water dropwise to make orthosilicate All ethyl esters were hydrolyzed to silica, and the resulting samples were dried at 120°C. Then, the obtained sample and polyvinyl chloride were mixed by ball milling at a mass ratio of 3:1, and then heated to 600°C at a rate of 2°C per minut...

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Abstract

The invention discloses a preparation method of a multiple composite anode material of a lithium ion battery. The preparation method comprises the following steps of: (1) treating silicon, silicon monoxide and cane sugar by methods such as ball milling and carbonization to obtain a primary sample with a silicon/silicon monoxide/carbon multiple composite structure; (2) dispersing the primary sample obtained in the step (1) in the mixed solution of ethyl orthosilicate and ethanol and adding excessive distilled water so that the ethyl orthosilicate is completely hydrolyzed into silicon dioxide, and drying; performing treatments such as ball milling and carbonization on the sample obtained after drying and polyvinyl chloride to obtain the silicon/silicon monoxide/carbon/silicon dioxide/carbon multiple composite anode material. The composite cathode material prepared by the method provided by the invention is spherically granular, even in particle size distribution and high in electronic conductivity; and the cathode material with such a composite structure is capable of improving the electrochemical properties of a silicon-based material.

Description

technical field [0001] The invention relates to a preparation method of a multiple composite negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion battery is a new type of rechargeable battery with high specific energy, long service life, clean and pollution-free. It has been widely used in various portable electronic devices, electric vehicles, large energy storage base stations and other fields. In the structure of lithium-ion batteries, the positive and negative electrode materials are the key substances that determine the energy storage, service life, price and other factors of lithium-ion batteries. However, since the commercialization of lithium-ion batteries, the positive electrode materials have been continuously introduced, while the negative electrode materials have been using graphite materials, which hinders the further improvement of the energy density of lithium-ion batteries, making the current lithium-ion batteries un...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139
CPCY02E60/122H01M4/364H01M4/386H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 刘望才连通叶金晶唐旭舒杰
Owner MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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