McDermott Will & Emery LLP
Positive electrode active material and non-aqueous electrolyte secondary battery containing the same
The present invention relates to a positive electrode active material comprising a lithium-containing composite oxide containing nickel with an oxidation state of 2.0 to 2.5 and manganese with an oxidation state of 3.5 to 4.0, the oxidation state determined by the shifts of energy at which absorption maximum is observed in the X-ray absorption near-K-edge structures, and to a non-aqueous electrolyte secondary battery using the same, the positive electrode active material being characterized in having a high capacity, a long storage life and excellent cycle life.
Panasonic Corporation Osaka City University
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Tsutomu Hiroshi Masatoshi
Ohzuku Yoshizawa Nagayama