Patent ID: 11923534
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A nonaqueous electrolyte secondary battery, comprising:
a positive electrode;
a negative electrode; and
a nonaqueous electrolyte, wherein
the positive electrode includes a positive electrode active material layer,
the positive electrode active material layer contains a lithium composite oxide having a layered structure as a positive electrode active material,
the lithium composite oxide is in a form of porous particles,
each of the porous particles has a plurality of voids, wherein
at least two voids of the plurality of voids each has a percentage of void area with respect to an area occupied by each of the particles in a cross-sectional view thereof of at least 1%, and
at least one void of the plurality of voids connects an interior of each of the particles to a surface thereof and has an opening,

the opening has an opening diameter of at least 100 nm,
the porous particles have an average void ratio of at least 10% and not more than 50%, and a percentage of particles having a void ratio of at least 10% and not more than 50% in the porous particles is at least 80%, and
each of the porous particles is provided with a coating of lithium tungstate on a surface thereof.