NEGATIVE ELECTRODE MATERIAL, NEGATIVE ELECTRODE CONTAINING NEGATIVE ELECTRODE MATERIAL, AND NEGATIVE ELECTRODE MANUFACTURING METHOD

A negative electrode material includes a silicon-containing material. The silicon-containing material includes at least one of pure silicon, silicon carbon, a silicon alloy, or a silicon oxide. A ratio B/A of a maximum value B in differentials dQ/dV with respect to 0.4V-0.55V to a maximum value A in differentials dQ/dV with respect to 0.2V-0.35V is 1.0-3.0 when the negative electrode material is electrified in a delithiation direction in a case of charging and discharging a battery that includes the negative electrode material used as a working electrode, metallic lithium used as a counter electrode, and an electrolyte containing a lithium-ion conductive substance, and in a case of plotting a relationship curve between a differential dQ/dV and a working electrode potential V, where the differential is obtained by differentiating a charge/discharge capacity Q with respect to the working electrode potential V.