National Institute of Advanced Industrial Science and Technology

Yuko Oka

Mitsuharu Tabuchi

Tomonari Takeuchi

Kuniaki Tatsumi

Tomonari c/o Kansai Center Of National Institute Of Advanced Industrial Science And Technology Takeuchi

Mitsuharu c/o Kansai Center Of National Institute Of Advanced Industrial Science And Technology Tabuchi

Kuniaki c/o Kansai Center Of National Institute Of Advanced Industrial Science And Technology Tatsumi

The invention provides a lithium-manganese-based composite oxide containing Ti and Ni, which is represented by the compositional formula: Li(MnNiTi)O, wherein 0&#x3c;x&#x2266;0.33, 0.05&#x3c;m&#x3c;0.3, and 0.3&#x3c;n&#x3c;0.5, and includes a crystal phase of layered rock-salt type structure. The composite oxide is a novel material that is capable of maintaining an average discharge voltage of 3 V or more over long charge/discharge cycles, while providing a discharge capacity equal to or higher than those of lithium-cobalt-oxide-based positive electrode materials, and that can be prepared using starting materials that are inexpensive and less limited as natural resources, while exhibiting improved charge/discharge characteristics over known low-cost positive electrode materials.

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Ikeda, Japan

Yuko Oka