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

Claim 5:
6. A negative electrode prepared by a process comprising:
mixing a powder consisting of lithium titanate oxide particles, a binder, and a solvent to prepare a particle-dispersed liquid;
after mixing the lithium titanate oxide particles, binder, and solvent to prepare the particle-dispersed liquid, granulating a powder consisting of graphite-based particles by using the particle-dispersed liquid to prepare wet granules; and
forming the wet granules into a negative electrode composite material layer; and
placing the negative electrode composite material layer on a surface of a negative electrode current collector to produce the negative electrode comprising the negative electrode composite material layer disposed on the negative electrode current collector,
wherein:
the negative electrode composite material layer includes 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 the 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.