Patent ID: 9577255
Date: 2017-02-21
CPC Classifications: C01B,C23C,H01M,Y02E

Claim:
1. A negative electrode active material for a non-aqueous electrolyte rechargeable battery, wherein when SiOx having a molar ratio of oxygen to silicon (O/Si) of 0.5 to 1.6 is evaluated by x-ray photoelectron spectroscopy (XPS) analysis, at least one XPS peak representing Si—O binding energy exists in the range of 98 to 108 eV, and a ratio of P1 to P2 (P1/P2) is in the range of 2.5 to 20, wherein P1 is defined as the maximum binding energy peak value at 102 to 105 eV and P2 is defined as the maximum binding energy peak value at 98 to 101 eV; and wherein the SiOx has a structure in which crystalline silicon is dispersed in silicon dioxide, and a crystallite size of the crystalline silicon estimated by a Scherrer equation based on 2-theta of a diffraction peak from a Si (111) plane in an X-ray diffraction analysis is in the range of 1.0 to 15.0 nm, wherein an average particle size (D