Silicon carbon negative electrode material, negative electrode sheet, secondary battery, battery module, battery pack and power consumption apparatus
The present application provides a silicon carbon negative electrode material, a negative electrode sheet including the same, a secondary battery, a battery module, a battery pack and a power consumption apparatus. A battery composed of a negative electrode prepared by the silicon carbon negative electrode material in the present application as a working electrode, metal lithium as a counter electrode and an electrolyte containing a lithium ion conductive substance may be charged and discharged, and in a case of drawing a relationship graph between a differential value dQ/dV obtained by differentiating a charging and discharging capacity Q by a working electrode potential V and the working electrode potential V, when energizing the negative electrode material in a direction of delithiation, a ratio of a maximum Y of dQ/dV between 400-480 mV to a maximum X of dQ/dV between 200-255 mV may be in a range of 3.5 to 15.
1. A silicon carbon negative electrode material, wherein,
a battery composed of a negative electrode prepared by the silicon carbon negative electrode material as a working electrode, metal lithium as a counter electrode and an electrolyte containing a lithium ion conductive substance is charged and discharged, and in a case of drawing a relationship graph between a differential value dQ/dV obtained by differentiating a charging and discharging capacity Q by a working electrode potential V and the working electrode potential V, when energizing the negative electrode material in a direction of delithiation, a ratio of a maximum Y of dQ/dV between 400-480 mV to a maximum X of dQ/dV between 200-255 mV is in a range of 3.5 to 15,
the silicon carbon negative electrode material has no pores or a number of pores with a diameter greater than 50 nm in a single silicon carbon negative electrode material particle is less than 10,
a content of the silicon is in a range of 2.5% to 10%, based on a total weight of the silicon carbon negative electrode material,
a median particle size Dv50 of the silicon carbon negative electrode material is in a range of 10 μm to 15 μm, and
a specific surface area of the silicon carbon negative electrode material is in a range of 1 m 2 to 3 m 2 .
2. The silicon carbon negative electrode material according to claim 1 , wherein,
in an X-ray diffraction pattern, a ratio of an intensity of a peak at 28.4 at 2θ to an intensity of a peak at 54.6 at 2θ is in a range of 1.1 to 4.5.
3. A secondary battery, comprising the silicon carbon negative electrode material according to claim 1 .
4. A power consumption apparatus, comprising the secondary battery according to claim 3 .