Non-aqueous electrolyte secondary battery negative electrode material, making method, lithium ion secondary battery, and electrochemical capacitor

摘要

A negative electrode material comprises a conductive powder of particles of a lithium ion-occluding and releasing material coated on their surface with a graphite coating. The graphite coating, on Raman spectroscopy analysis, develops broad peaks having an intensity I 1330 and I 1580 at 1330 cm -1 and 1580 cm -1 Raman shift, an intensity ratio I 1330 /I 1580 being 1.5 < I 1330 /I 1580 < 3.0. Using the negative electrode material, a lithium ion secondary battery having a high capacity and improved cycle performance can be manufactured.