CPC H01M 4/5825 (2013.01) [H01M 4/525 (2013.01); H01M 4/621 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 10/0585 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 23 Claims |
1. 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;
particles present in the positive electrode active material layer have a median diameter of 1.0 μm to 5.0 μm, based on a volume-based particle size distribution;
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)≤1.010q 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.
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