Non-aqueous electrolyte secondary battery and positive electrode active material therefor
AssigneePanasonic Corporation
InventorsShinichi Waki, Youko Sano, Yasuhiko Bito, Tetsuo Nanno
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Abstract
A positive electrode active material for a non-aqueous electrolyte secondary battery including a manganese oxide having a spinel structure, wherein the manganese oxide is represented by the general formula: Li1+aMn2−x−aMxO4+y, where M is a transition metal element having an oxidation number of 2 or greater, M≠Mn, 0.17≦x≦0.5, −0.2≦y≦0.5 and 0≦a≦0.2.
Claims14
A positive electrode active material for a non-aqueous electrolyte secondary battery comprising:
- a manganese oxide having a spinel structure,
- said manganese oxide being represented by the general formula:
- Li1+aMn2−x−aMxO4+y, where M is one or more transition metal elements having an oxidation number of 2 or greater, M≠Mn, 0.17≦x≦0.5, 0.2≦y≦0.5 and 0≦a≦0.2,
- wherein said manganese oxide has a lattice constant of 8.16 angstroms to 8.2 angstroms.
A positive electrode active material for a non-aqueous electrolyte secondary battery comprising:
- a manganese oxide having a spinel structure,
- said manganese oxide being represented by the general formula:
- Li1+aMn2−α−β−aM1αM2βO4+y, where M1 is at least one element selected from the group consisting of Ni and Fe, M2 is a transition metal element other than Ni and Fe having an oxidation number of two or greater, α+β=x, 0<α, 0≦β, 0.1≦x≦0.5, 0.2<y≦0.5 and 0≦a≦0.2,
- wherein said manganese oxide has a lattice constant of 8.16 angstroms to 8.2 angstroms.
A non-aqueous electrolyte secondary battery comprising:
- a positive electrode containing a positive electrode active material,
- said positive electrode active material comprising:
- a manganese oxide having a spinel structure,
- said manganese oxide being represented by the general formula:
- Li1+aMn2−x−aMxO4+y, where M is one or more transition metal elements having an oxidation number of 2 or greater, M≠Mn, 0.17≦x≦0.5, 0.2<y≦0.5 and 0≦a≦0.2
- a negative electrode containing a negative electrode active material, and
- a lithium ion-conductive non-aqueous electrolyte,
- wherein an end-of-charge voltage of said battery is set to 3.5 V or less, and an end-of-discharge voltage of said battery is set to 2.5 V or greater.
A charge/discharge system comprising:
- a non-aqueous electrolyte secondary battery,
- a charger for charging said non-aqueous electrolyte secondary battery, and
- a discharge controller for said non-aqueous electrolyte secondary battery,
- said non-aqueous electrolyte secondary battery comprising a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material and a lithium ion-conductive non-aqueous electrolyte,
- said positive electrode active material comprising a manganese oxide having a spinel structure, said manganese oxide being represented by the general formula:
- Li1+aMn2−x−aMxO4+y, where M is a transition metal element having an oxidation number of 2 or greater, M≠Mn, 0.17≦x≦0.5, 0.2<y≦0.5 and 0≦a≦0.2,
- said charger being set to have an end-of-charge voltage of said battery of 3.5 V or less, and
- said discharge controller being set to have an end-of-discharge voltage of said battery of 2.5 V or greater.
Dependencies are inferred from the claim text.