| abstract |
The present invention relates to a negative electrode active material for a negative electrode active material layer of a lithium secondary battery, wherein the negative electrode active material contains a silicon-based material (SiO x : 0.5? X? 1.6) and has a bond energy in a Si 1s waveform obtained by X- And has at least two peaks in the range of not less than 537 eV and not more than 537 eV. Thereby, when used as a negative electrode active material of a lithium ion secondary battery, a negative electrode active material capable of improving battery capacity, cycle characteristics, and initial charge / discharge characteristics is provided. |