Patent ID: 11962012
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A negative electrode of a lithium-ion secondary battery, the negative electrode comprising:
at least a negative electrode composite material layer,
the negative electrode composite material layer including graphite-based particles, lithium titanate oxide particles, and a binder,
the negative electrode composite material layer including the lithium titanate oxide particles in an amount not lower than 3 mass % and not higher than 5 mass % of a total amount of the graphite-based particles and the lithium titanate oxide particles,
a ratio of a D50 of the graphite-based particles to a D50 of the lithium titanate oxide particles is not lower than 20 and not higher than 250,
the graphite-based particles are linked to each other via linking portions consisting of the lithium titanate oxide particles and binder with no direct contact between graphite-based particles and an amount of an electric current flowing across an interface between adjacent ones of the graphite-based particles measured in a cross section of the negative electrode composite material layer with a scanning probe microscope is not lower than 13 nA and not higher than 75 nA.