Seimi Chemical Co., Ltd.

Toshiaki Abe

Manabu Suhara

Naoshi Saito

Takeshi Kawasato

Megumi Uchida

Koji Tatsumi

A process for producing a lithium-containing composite oxide for a positive electrode active material for use in a lithium secondary battery, the oxide having the formula LiNMOF(wherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than N, 0.9&#x2266;p&#x2266;1.2, 0.9&#x2266;x&#x3c;1.00, 0&#x3c;m&#x2266;0.03, 1.9&#x2266;z&#x2266;2.2, x+m=1 and 0&#x2266;a&#x2266;0.02), which comprises using as an M element source a solution comprising a complex containing the M element dissolved in an organic solvent.

Process for producing lithium-containing composite oxide for positive electrode for lithium secondary battery

A positive electrode material for a lithium secondary battery for high voltage high capacity use exhibiting high cycle durability and high safety. The positive electrode material is composed of particles having a composition represented by the general formula: LiCoMgAOF(A is the group 6 transition element or the group 14 element, 0.90&#x2266;a&#x2266;1.10, 0.97&#x2266;b&#x2266;1.00, 0.0001&#x2266;c&#x2266;0.03, 0.0001&#x2266;d&#x2266;0.03, 1.98&#x2266;e&#x2266;2.02, 0&#x2266;f&#x2266;0.02 and 0.0001&#x2266;c+d&#x2266;0.03), and magnesium, the element A and fluorine exist uniformly in the vicinity of the surfaces of the particles.

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Chigasaki, Japan

Toshiaki Abe