NEGATIVE ELECTRODE ACTIVE MATERIAL AND METHOD FOR MANUFACTURING THE SAME

A negative electrode active material including negative electrode active material particles, wherein the negative electrode active material particles contain silicon compound particles containing lithium and oxygen, a ratio between oxygen and silicon satisfying SiOx:0.8≤X≤1.2, and containing Li2SiO3, a Si crystallite size is 10 nm or less, the particles are coated with a carbon coating, and a peak height P1 derived from at least a part of lithium carbonate and a peak height P2 derived from at least a part of Li2SiO3 satisfy a relationship of 2≤P2/P1≤3.5, the peak of P1 appearing within a range of a diffraction angle 2θ of 20 to 21° and the peak of P2 appearing within a range of the diffraction angle 2θ of 17 to 20° with X-ray diffraction using CuKα radiation.