Patent ID: 7344802

Claim:
A nonaqueous electrolyte secondary battery comprising a positive electrode comprising a positive electrode material on a positive electrode current collector, a negative electrode and a nonaqueous electrolyte, wherein the positive electrode material comprises a positive electrode active material represented by Li a Mn b Ni b Co 1-2b O 2 (wherein a is 0≦a≦1.1, and b is 0<b≦0.5), a polyvinylidene fluoride binder and an amorphous carbon electrically conductive agent, wherein the binder is contained in the positive electrode material in a range of 0.8˜3 weight %, the electrically conductive agent is contained in a range of 1˜3 weight % in the positive electrode material and a density of the positive electrode material is 3.0 g/cm 3 or more.