NEGATIVE-ELECTRODE ACTIVE SUBSTANCE, MIXED NEGATIVE-ELECTRODE ACTIVE SUBSTANCE MATERIAL, AND METHOD FOR MANUFACTURING NEGATIVE-ELECTRODE ACTIVE SUBSTANCE

The present invention A negative electrode comprising: a negative electrode current collector; and a negative electrode active material layer on the negative electrode current collector; the negative electrode active material layer including a negative electrode active material containing a negative electrode active material particle; the negative electrode active material particle comprising: a silicon compound particle containing a silicon compound that contains an oxygen, wherein the silicon compound particle contains a Li compound and the negative electrode active material particle has a surface layer portion containing a carbon material; and the negative electrode active material particle including: carbon material on a surface layer portion, and aluminum phosphorous composite oxide attached to at least part of the surface, wherein the aluminum phosphorous composite oxide may be expressed as a composite of PO and AlO, and the PO and the AlO in the aluminum phosphorous composite oxide are in a mass ratio in a range of 1.2 < mass of the PO/mass of the AlO < 3.0, wherein the negative electrode active material particle including aluminum phosphorous composite oxide has at least one peak in a region of a binding energy of more than 135 eV and 144 eV or less in a P 2p peak shape given in an X-ray photoelectron spectroscopy. This provides a negative electrode that is capable of increasing battery capacity, together with improving cycle performance and initial charge and discharge property