Silicon anode for lithium ion battery and preparation method thereof

Abstract

The invention discloses a silicon anode for a lithium ion battery and a preparation method thereof, and relates to the technical field of lithium ion battery anode preparation, and the preparation method comprises the following steps: adding organic silicon, ferrocene and thiophene into a carbon nanotube precursor solution, and stirring to prepare a mixed solution; continuously injecting the mixedsolution into a furnace tube of a vertical tube furnace in a reducing atmosphere, and sintering at high temperature to obtain a silicon-carbon film; and collecting the silicon-carbon film to preparethe silicon anode. Organic silicon, ferrocene, thiophene and a carbon nanotube precursor solution are mixed and sintered, and a generated amorphous silica compound grows in the length direction of a carbon tube to form a composite material while the carbon nanotube grows, so that the expansion of the volume of silicon in the diameter direction in the lithium intercalation and deintercalation process is effectively relieved; and when the material is applied to a lithium battery, the charge-discharge specific capacity and the conductivity of the lithium ion battery are improved, and the materialhas more stable cycle performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode preparation of lithium ion batteries, in particular to a silicon negative electrode for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery has become an ideal power supply for mobile phones, notebook computers, cars, etc. . In order to meet especially in the fields of wearable devices, medical devices, precision instruments and meters, higher requirements are put forward for key components in electronic products such as circuit boards and batteries. For example, with the development of smart wearable devices and precision instruments, the existing lithium batteries cannot meet the needs of repeated bending in the arc position of the device. At the same time, in order to be more sustainable and less likely to replace the used lithium batteries, research on flexible lithium-ion batteries with high capacity and long life has become a...

AI Technical Summary

Problems solved by technology

However, silicon, as the negative electrode material of lithium-ion batteries, also has disadvantages: during the process of lithium-ion intercalation and deintercalation of silicon materials, the material volume will expand and shrink by more than 300%, which will cause the electrode active material to separate from the current collector and lose electrical contact. , resulting in greatly reduced battery cycle performance; and silicon is a semiconductor material, its own low conductivity

[0004] Due to the defects of silicon itself, the industrialization of silicon anode materials is seriously restricted

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