A non-aqueous electrolyte secondary battery has a positive electrode having a
positive
electrode collector, on which a positive electrode active material layer containing
a positive electrode active material as a complex oxide of Li and transition metals
are formed, and a negative electrode having a negative collector, on which a negative
electrode active material layer is formed. The non-aqueous electrolyte secondary
battery is a gel or solid non-aqueous electrolyte secondary battery having a battery
device in which a positive electrode and a negative electrode are laminated with
an electrolyte layer therebetween in a film-state packaging member constructed
by metal foil laminated films, and containing a lithium salt, a non-aqueous solvent,
and a polymer material. The concentration in mass ratio of a free acid in the electrolyte
layer is 60 ppm and less. Average particle diameter of the positive electrode active
material lies in a range from 10 to 22 m, the minimum particle diameter
is 5 m or larger, the maximum particle diameter is 50 m or smaller,
and specific surface of the positive electrode active material is 0.25 m2/g
or smaller. Lithium carbonate (Li2CO3) contained in the positive
electrode active material is 0.15 percent by weight and less. Moisture contained
in the positive electrode active material is 300 ppm and less.