Patent ID: 11862798
Assignee: SEKISUI CHEMICAL CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 7:
8. A positive electrode for a non-aqueous electrolyte secondary battery, comprising a positive electrode current collector and a positive electrode active material layer provided on the positive electrode current collector, wherein:
the positive electrode active material layer comprises positive electrode active material particles;
the positive electrode active material particles comprise a positive electrode active material represented by a formula LiFexM(1-x)PO4, wherein 0≤x≤1, and M is Co, Ni, Mn, Al, Ti or Zr;
the positive electrode active material particles have, on at least a part of their surfaces, a coated section comprising a conductive material containing carbon;
when two directions perpendicular to a thickness direction of the positive electrode current collector and orthogonal to each other are defined as a first direction and a second direction,
an average thickness a1, a maximum thickness b1 and a minimum thickness c1 in a thickness distribution in the first direction as well as a thickness d1 which is largest in terms of an absolute value of the difference from the average thickness a1 satisfy inequations 1 and 2:

0.990≤(d1/a1)≤1.010  Inequation 1, and

(b1−c1)≤5.0 μm  Inequation 2, and

an average thickness a2, a maximum thickness b2 and a minimum thickness c2 in a thickness distribution in the second direction as well as a thickness d2 which is largest in terms of an absolute value of the difference from the average thickness a2 satisfy inequations 3 and 4:

0.990≤(d2/a2)≤1.010  Inequation 3, and

(b2−c2)≤5.0 μm  Inequation 4; and

the positive electrode active material layer has a volume density of 2.10 to 2.50 g/cm3.