| abstract |
The present invention is a negative electrode active material comprising negative electrode active material particles, the negative electrode active material particles containing silicon compound particles, the silicon compound particles containing a silicon compound, the silicon compound containing oxygen, the silicon compound particles containing a lithium compound, and the negative electrode active material particles at least a portion of its surface adhered aluminum oxide of phosphorus compound, the phosphorus-aluminum composite oxide P 2 O 5 and Al 2 O 3 composite, and the ratio of P 2 O 5 and the mass of the Al 2 O 3 It is in the range of 1.2<P 2 O 5 /Al 2 O 3 <3.0, and the aforementioned aluminum-phosphorus composite oxide-attached negative electrode active material particles are in the P2p waveform obtained by X-ray photoelectron spectroscopy, It has at least one peak in the range where the bond energy exceeds 135 eV and 144 eV or less. Thereby, there is provided a negative electrode active material which, when used as a negative electrode active material of a secondary battery, can stabilize the slurry, increase battery capacity, and improve cycle characteristics and initial charge and discharge characteristics. |