Positive electrode material for lithium secondary cell and process for producing the same
AssigneeSeimi Chemical Co., Ltd.
InventorsKoji Tatsumi, Toshiaki Abe, Naoshi Saito, Manabu Suhara
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Abstract
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: LiaCObMgcAdOeFf (A is the group 6 transition element or the group 14 element, 0.90≦a≦1.10, 0.97≦b≦1.00, 0.0001≦c>0.03, 0.0001≦d≦0.03, 1.98≦e≦2.02, 0≦f≦0.02 and 0.0001≦c+d≦0.03), and magnesium, the element A and fluorine exist uniformly in the vicinity of the surfaces of the particles.
Claims8
A positive electrode material for a lithium secondary battery wherein an active material for a positive electrode consists of particle having the composition represented by a general formula, LiaCobMgcAdOeFf (A is the group 6 transition element or the group 14 element, 0.90≦a≦1.10, 0.97≦b≦1.00, 0.0001≦c≦0.03, 0.0001≦d≦0.03, 1.98≦e≦2.02, 0≦f≦0.02 and 0.0001≦c+d≦0.03) wherein magnesium, the element A, or further fluorine are evenly present in the vicinity of the surface of said particle.
A method for manufacturing a positive electrode material for a lithium secondary battery wherein an active material for a positive electrode consists of particles having the composition represented by a general formula, LiaCobMgcAdOeFf (A is the group 6 transition element or the group 14 element, 0.90≦a≦1.10, 0.97≦b≦1.00, 0.0001≦c≦0.03, 0.0001≦d≦0.03, 1.98≦e≦2.02, 0≦f≦0.02 and 0.0001≦c+d≦0.03) wherein magnesium, the element A, or further fluorine is evenly present in the vicinity of the surface of said particles, and
- a cobalt material consisting of particles wherein 10 or more primary particles aggregate to form secondary particles and containing at least either cobalt oxyhydroxide or cobalt hydroxide, lithium carbonate, and a material containing magnesium, said element A or further fluorine are mixed and fired.
Dependencies are inferred from the claim text.