Silicon-based negative electrode material and preparation method thereof, negative electrode, battery and electronic equipment

Abstract

The invention provides a silicon-based negative electrode material which comprises a silicon-based inner core, a carbon layer coating the silicon-based inner core and a phenyl compound layer coating the carbon layer, the structural formula of a phenyl compound in the phenyl compound layer is as shown in formula (I), R1 has a carbon-carbon double bond or a carbon-carbon triple bond, at least one substituent group of R2, R3, R4, R5 and R6 has an organic acid group; or R1 is an organic acid group having a carbon-carbon double bond or a carbon-carbon triple bond. The silicon-based negative electrode material is stable in performance, high in cycle efficiency and beneficial to wide application. The invention also provides a preparation method of the silicon-based negative electrode material, a negative electrode, a battery and electronic equipment.

Description

technical field

[0001] The application belongs to the field of battery technology, and in particular relates to a silicon-based negative electrode material, a preparation method thereof, a negative electrode, a battery and electronic equipment. Background technique

[0002] Existing silicon-based anode materials have attracted extensive attention due to their very high theoretical specific capacity. However, silicon-based negative electrode materials experience large volume changes during repeated charge and discharge, which may even cause silicon-based negative electrode materials to be crushed, affecting the performance of silicon-based negative electrode materials, thus severely restricting the application of silicon-based negative electrode materials. Contents of the invention

[0003] In view of this, the present application provides a silicon-based negative electrode material with excellent performance.

[0004] In a first aspect, the present application provides a ...

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