Positive electrode material, its manufacturing method and lithium secondary battery
AssigneesHitachi, Ltd., Hitachi Metals, Ltd., Shin-Kobe Electric Machinery Co., Ltd.
InventorsToyotaka Yuasa, Masahiro Kasai, Genei Nakajima
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Abstract
The object of the invention is to provide positive electrode material in which a discharge rate characteristic and battery capacity are hardly deteriorated in the environment of low temperature of −30° C., its manufacturing method and a lithium secondary battery using the positive electrode material. The invention is characterized by the positive electrode material in which plural primary particles are flocculated and a secondary particle is formed, and the touch length of the primary particles is equivalent to 10 to 70% of the length of the whole periphery on the section of the touched primary particles.
Claims7
A lithium secondary battery for a vehicle comprising:
- a positive electrode made of a positive electrode material comprising:
- plural primary particles flocculated to form a secondary particle, wherein a voidage of the secondary particle is 2.5 to 35%, the crystal orientations of c axes of 60% or more of the primary particles in the secondary particle are within 20 degrees, the secondary particle is represented as LiaMnxNiyCozO2, and the secondary particle is composed of crystals having layer structure of composite oxide meeting 1<a≦1.2, 0≦x≦0.65, 0.33≦y<0.5, 0≦z≦0.65 and x+y+z=1;
- a negative electrode;
- and
- a non-aqueous electrolyte.
Dependencies are inferred from the claim text.