Nonaqueous electrolyte secondary battery
AssigneeSanyo Electric Co., Ltd.
InventorsTakuya Sunagawa, Hiroyuki Fujimoto, Ryuji Ohshita, Shin Fujitani
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Abstract
A nonaqueous electrolyte secondary battery characterized as using a mixture of a first oxide and a second oxide for its positive electrode material. The first oxide is a spinel oxide consisting substantially of lithium, manganese, a metal other than manganese, and oxygen. The second oxide is different in composition from the first oxide and consists substantially of lithium, nickel, cobalt, a metal other than nickel and cobalt, and oxygen.
Claims22
A nonaqueous electrolyte secondary battery comprising a mixture of a first oxide and a second oxide for it's a positive electrode material of said battery,
- wherein said first oxide is a spinel lithium-manganese complex oxide that consists substantially of lithium, manganese, a metal other than manganese, and oxygen and that is represented by the compositional formula LixMn2−yM1yO4+z where M1 is at least one of Al and Mg, 0≦x≦1.2, 0<y≦0.1 and −0.2≦z≦0.2, and
- wherein said second oxide is represented by the compositional formula LiaM2bNicCodO2 where M2 is at least one element selected from the group consisting of Al, Mn, Mg and Ti, 0<a<1.3, 0.02≦b≦0.3, 0.02≦d/(c+d)≦0.9 and b+c+d=1.
A nonaqueous electrolyte secondary battery comprising a mixture of a first oxide, a second oxide and a third oxide for it's a positive electrode material of said battery,
- wherein said first oxide is a spinel oxide consisting substantially of lithium, manganese, a metal other than manganese, and oxygen,
- wherein said second oxide is different from said first oxide and consists substantially of lithium, nickel, cobalt, a metal other than nickel and cobalt, and oxygen,
- wherein said third oxide is different from said first and second oxides and consists substantially of lithium, cobalt and oxygen or of lithium, cobalt, a metal other than cobalt, and oxygen, and
- wherein said third oxide has a mean particle diameter of 3-15 μm.
A nonaqueous electrolyte secondary battery comprising a mixture of a first oxide, a second oxide and a third oxide for a positive electrode material of said battery,
- wherein said first oxide is a spinel oxide consisting substantially of lithium, manganese, a metal other than manganese, and oxygen,
- wherein said second oxide is different from said first oxide and consists substantially of lithium, nickel, cobalt, a metal other than nickel and cobalt, and oxygen,
- wherein said third oxide is different from said first and second oxides and consists substantially of lithium, cobalt, a metal other than cobalt, and oxygen, and
- wherein said third oxide is represented by the compositional formula LieM3fCo1−fO2 where M3 is at least one element selected from the group consisting of Mg and Ti, 0<e<1.3 and 0.02≦f≦0.2.
A nonaqueous electrolyte secondary battery comprising a mixture of a first oxide, a second oxide and a third oxide for a positive electrode material of said battery,
- wherein said first oxide is a spinel oxide consisting substantially of lithium, manganese, a metal other than manganese, and oxygen,
- wherein said second oxide is different from said first oxide and consists substantially of lithium, nickel, cobalt, a metal other than nickel and cobalt, and oxygen,
- wherein said third oxide is different from said first and second oxides and consists substantially of lithium, cobalt and oxygen or of lithium, cobalt, a metal other than cobalt, and oxygen, and
- wherein said second oxide has a mean particle diameter of 3-15 μm.
Dependencies are inferred from the claim text.