Patent ID: 11936034
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A negative electrode active material for a secondary battery comprising:
a silicate phase including elements Na, Si, and Mx, wherein Mx represents one or more elements other than an alkali metal or Si; and
silicon particles dispersed in the silicate phase, wherein,
the Mx includes at least one of elements Y, Nb, V, La, and T
in the silicate phase, the element Na content is 9 mol % to 52 mol %, and the element Mx content is 3 mol % to 50 mol %, and a Si content is 25 mol % or more, each based on the total amount other than oxygen, and
the silicon particles have an average particle size of less than 100 nm.