PURPOSE: To suppress the capacity loss generated in the first cycle and increase the charging and discharging capacity and volume energy density by putting the face interval in specified direction of a negative carbonic material, the size of crystals, and the lattice distortion in specified range.
CONSTITUTION: A nonaqueous electrolytic secondary battery is equipped with a positive electrode 1 including lithium, a negative electrode 2 consisting of carbonic material, and a nonaqueous lithium ion conductive electrolyte. For this negative electrode material, the face interval of 002 face being sought by X-ray wide-angle diffraction method is 3.45-3.55, and the distortion of the lattice of the crystal being sought from the size of the crystal in the direction of c axis sought from the peak equivalent to 002 face and the size of the crystal in the direction of c axis sought from the peak equivalent to 004 face is 0.04-0.07. Hereby, the occlusion and discharge amounts of lithium at the time of charging and discharging in high current density can be increased, and also the capacity loss can be lessened.
NAGURA HIDEAKI
YAMAMOTO KOHEI
HINO YOSHIHISA
HARADA YOSHIRO
NARITA NOZOMI
