Panasonic Corporation

Shinichi Waki

Yasuhiko Bito

Teruaki Yamamoto

Youko Sano

Tetsuo Nanno

Tomohiro Ueda

The invention includes, as a positive electrode material, active material particles comprising a lithium-containing manganese oxide represented by the general formula: LiMnMOwhere M is a transition metal element other than Mn, 0&#x3c;x&#x2266;0.5, &#x2212;0.2&#x2266;y&#x2266;0.5, and 0&#x2266;a&#x2266;0.33. The molar ratio A of M to the total of Mn and M in the surface of the active material particles and the molar ratio B of M to the total of Mn and M in the whole active material particles satisfy the relations: A/B&#x3e;1.0 and A&#x2267;0.3. In an X-ray diffraction analysis using CuKa radiation as an X-ray source, the intensity ratio of the largest peak of peaks attributed to an oxide of the transition metal element M to a peak around 2&#x3b8;=36.4&#xb0; is 0.25 or less.

Positive electrode material for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery using the same, and method for producing positive electrode material for non-aqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode active material that comprises a lithium-containing manganese oxide, and the negative electrode includes a negative electrode active material that comprises silicon and a transition metal element. When the battery voltage is 0 V, the positive electrode and the negative electrode have a potential of 1.8 V or higher relative to lithium metal (Li/Li). Since the deterioration of the positive and negative electrode active materials is suppressed, this non-aqueous electrolyte secondary battery has both high capacity and excellent deep discharge cycle life.

Non-aqueous electrolyte secondary battery

A positive electrode active material for a non-aqueous electrolyte secondary battery including a manganese oxide having a spinel structure, wherein the manganese oxide is represented by the general formula: LiMnMO, where M is a transition metal element having an oxidation number of 2 or greater, M&#x2260;Mn, 0.17&#x2266;x&#x2266;0.5, &#x2212;0.2&#x2266;y&#x2266;0.5 and 0&#x2266;a&#x2266;0.2.

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Osaka, Japan

Shinichi Waki