To provide a lithium ion secondary battery which has a high output characteristics at low temperature and has a high capacity, and to provide a negative electrode material for lithium ion secondary battery and a negative electrode for lithium ion secondary battery, for achieving the above battery.
In the negative electrode material for the lithium ion secondary battery, a size Lc of crystallite analyzed by an X-ray diffraction method is 20 to 90 nm and an average surface distance (d002) is 0.3354 to 0.3370 nm, and a low crystallinity carbon layer is formed on its surface. The negative electrode for the lithium ion secondary battery is composed by having the above negative electrode material, and the lithium ion secondary battery is composed by using the above negative electrode.
Ida, Yuriko
Okabe, Keiji
Ishii, Yoshito
