Positive electrode material for lithium secondary battery, production method thereof, and lithium secondary battery
AssigneeShin-Kobe Electric Machinery Co., Ltd.
InventorsToyotaka Yuasa, Masahiro Kasai, Sai Ogawa
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Abstract
A positive electrode material for lithium secondary battery having high electron conductivity even at very low temperatures, a production method thereof, and a lithium secondary battery with the use of the positive electrode material are provided. The characteristic feature of this positive electrode material for lithium secondary battery is that a positive electrode active material having secondary particles formed of primary particles made of lithium complex oxides and ultrathin carbon fibers having lengths equal to or smaller than the diameters of the secondary particles of the positive electrode active material are composited.
Claims18
A positive electrode material for lithium secondary battery, comprising:
- a positive electrode active material having secondary particles formed of primary particles made of lithium complex oxides;
- and
- ultrathin carbon fibers having lengths equal to or smaller than the diameters of the secondary particles of the positive electrode active material,
- wherein the positive electrode active material and the ultrathin carbon fibers are composited.
A method of producing positive electrode material for lithium secondary battery, comprising:
- mixing a positive electrode active material having secondary particles formed of primary particles made of lithium complex oxides with ultrathin carbon fibers by a ball mill to fragment the ultrathin carbon fibers by adjusting the time of mixing so as to fragment the ultrathin carbon fibers to lengths equal to or smaller than the diameters of the secondary particles.
Dependencies are inferred from the claim text.