Negative electrode material and preparation method thereof, secondary battery and electric device

Abstract

The invention provides a negative electrode material and a preparation method thereof, a secondary battery and an electric device, and particularly relates to the technical field of secondary batteries. The negative electrode material comprises an inner core and a coating layer, the inner core comprises artificial graphite, the surface of the inner core is coated with the coating layer, the coating layer comprises amorphous carbon, and the particle size of the negative electrode material meets the conditions that Dv97 is 15-60 [mu] m, and Dv97 / Dv90 is 1.0-1.25. According to the invention, the granularity of the negative electrode material is optimized by controlling the technological process, so that the fast charging capacity of the negative electrode material in a high SOC state can be improved, and the fast charging performance of the battery can be remarkably improved when the negative electrode material is applied to the battery.

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