Preparation method for silicon-carbon composite material, prepared silicon-carbon composite material, lithium ion battery anode containing silicon-carbon composite material and battery

Abstract

The invention provides a preparation method for a silicon-carbon composite material, the prepared silicon-carbon composite material, a battery anode prepared from the material and a lithium ion battery. The preparation method comprises the following steps of: directly mixing free phenol, free aldehyde and silicon monoxide, performing polymerization reaction under certain conditions to obtain a mixture of a phenolic resin and the silicon monoxide which is coated by the phenolic resin, and performing thermal treatment and corrosion to obtain the silicon-carbon composite material with a core shell structure. The preparation method is simple. The prepared silicon-carbon composite material has the advantages of high specific capacity and high cycle performance.

Description

technical field

[0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a method for preparing a silicon-carbon composite material, the prepared silicon-carbon composite material, and a lithium ion battery negative electrode and battery containing the silicon-carbon composite material. Background technique

[0002] With the depletion of fossil fuels and the rapid development of portable electronic devices and electric vehicles, the research on new energy sources such as power source batteries has become the focus of global attention. Excellent properties such as good performance, environmental friendliness, structural diversity and low price have been widely used. As far as the structure of lithium ion battery is concerned, it is mainly composed of positive electrode, negative electrode, separator and electrolyte, and whether the electrode performance of negative electrode material can be further improved becomes the decisiv...

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