Patent ID: 11909038
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
1. A negative electrode active material comprising
a negative electrode active material particle having: (i) a peak in a range of 539 to 541 eV in a XANES spectrum that is obtained by XANES measurement of the negative electrode active material particle, and (ii) a strongest peak at the vicinity of 532 eV in the XANES spectrum; wherein
the negative electrode active material particle exhibits a decrease in the strongest peak at the vicinity of 532 eV in occlusion of Li,
the negative electrode active material particle exhibits a peak generated at the vicinity of 534 eV in the XANES spectrum in occlusion of Li, wherein
Li is inserted into a Si—O bond to reduce at least part of Si—O bonds and to form a Li—Si bond or an O—Li bond, and
the peak at the vicinity of 532 eV is attributable to Si—O bonds which contribute to occlusion of Li; and

the negative electrode active material particle comprises a silicon compound shown by SiOx, where 0.5≤x≤1.6 wherein
the silicon compound comprises a silicon dioxide (SiO2) component and a silicon (Si) component.