Patent ID: 8778541

Claim:
A negative electrode used for a nonaqueous electrolyte solution battery having nonaqueous electrolyte solution containing lithium ion, the negative electrode comprising: a metal carbon composite material including a porous carbon material and a metal material, the porous carbon material being made of carbon material having cavities, the metal material being made of metal to reversibly store or emit lithium ion, the metal material being arranged on a surface of the porous carbon material including inner surfaces of the cavities, wherein the porous carbon material has a concentration of 1-65 mass % when the metal carbon composite material is defined to have a mass of 100 mass %, the porous carbon material comprises a plurality of dendritic objects having a three-dimensional mesh structure, the porous carbon material has a first pore having a first diameter and a second pore having a second diameter larger than the first diameter of the first pore, the first pore is a pore defined on the dendritic object and the second pore is a cavity defined between the plurality of dendritic objects entangling with each other, the first diameter is smaller than or equal to 10 nm, the second diameter is in a range between 10 nm and 100 nm, the metal material is arranged on an inner surface of the first pore and an inner surface of the second pore, and the metal carbon composite material has a particle shape having a diameter in a range between 0.5 μm and 100 μm.