Abstract: A non-aqueous electrolyte secondary battery includes an electrode body, a non-aqueous electrolyte, and a battery case. The electrode body has a cathode and an anode. The cathode has a cathode active substance. The anode has an anode active substance. A relationship between an irreversible capacity of the anode and an irreversible capacity of the cathode satisfies Uc<Ua. Where, Ua is the irreversible capacity of the anode, which is a product of multiplying a unit irreversible capacity of the anode per 1 g of the anode active substance by a mass of the anode active substance, and Uc is the irreversible capacity of the cathode, which is a product of multiplying a unit irreversible capacity of the cathode per 1 g of the cathode active substance by a mass of the cathode active substance.

Abstract: A negative electrode material for lithium ion secondary batteries includes core-shell composite particles prepared by covering the surface of a graphite powder with an amorphous carbon powder via a carbide of binder pitch, the graphite powder having an average particle diameter of 5 to 30 ?m and an average lattice spacing d(002) of less than 0.3360 nm, and the amorphous carbon powder having an average particle diameter of 0.05 to 2 ?m and an average lattice spacing d(002) of 0.3360 nm or more. A method to produce the negative electrode material includes mixing a graphite powder with pitch having a softening point of 70 to 250° C., adding an amorphous carbon powder to the resulting product, kneading the mixture while applying a mechanical impact to soften the pitch and carbonizing the pitch by heat treatment of the mixture at 750 to 2250° C. in a non-oxidizing atmosphere.

Abstract: A negative electrode material for lithium secondary batteries includes carbon microspheres having an arithmetic mean particle diameter do measured using an electron microscope of 150 to 1000 nm, a volatile content Vm of 5.0% or less, a ratio ?Dst/Dst (where, Dst indicates the Stokes mode diameter Dst measured using a disk centrifuge (DCF), and ?Dst indicates the half-width of the Stokes mode diameter Dst) of 0.40 to 1.10, and a lattice spacing (d002) measured by X-ray diffractometry of 0.370 nm or less. The negative electrode material is used for a high-output lithium secondary battery that has a high lithium ion doping-undoping speed and excellent cycle characteristics, and is suitable as a power supply for portable instruments, hybrid cars, electric vehicles, and the like.

Abstract: A negative electrode material for lithium ion secondary batteries includes core-shell composite particles prepared by covering the surface of a graphite powder with an amorphous carbon powder via a carbide of binder pitch, the graphite powder having an average particle diameter of 5 to 30 ?m and an average lattice spacing d(002) of less than 0.3360 nm, and the amorphous carbon powder having an average particle diameter of 0.05 to 2 ?m and an average lattice spacing d(002) of 0.3360 nm or more. A method to produce the negative electrode material includes mixing a graphite powder with pitch having a softening point of 70 to 250° C., adding an amorphous carbon powder to the resulting product, kneading the mixture while applying a mechanical impact to soften the pitch, so that the amorphous carbon powder is dispersed and stabilized in the pitch that has softened, and carbonizing the pitch by heat treatment of the mixture at 750 to 2250° C. in a non-oxidizing atmosphere.