To provide a nonaqueous electrolyte secondary battery of which the cathode is improved so that the cathode active material particles may not be isolated from a conductive network due to repetition of charge and discharge without largely increasing content of the conductive agent in the cathode active material layer, and a high output and a long life of the battery are realized.
The cathode 1 includes an active material layer 10 and a current collector 11, and 80 wt.% or more of the total amount of the active material contained in the active material layer 10 are in a form of a primary particle 12a and a conductive coating layer 13 is formed on the surface of the primary particle 12a. With this construction, destruction of the active material itself due to repetition of charge and discharge and volume change of the active material layer 10 are sufficiently suppressed. As a result, a conductive network formed firmly between the primary particles 12a is maintained and output characteristics and life characteristics can be made compatible in high order.
OKADA YUKIHIRO
Shinichi Kawasaki
Susumu Saito
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