Non- aqueous electrolyte secondary battery
A non-aqueous electrolyte secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator and a non-aqueous electrolyte, wherein the positive electrode active material includes a nickel-containing composite oxide represented by the following formula (1): Li d (Ni a Mn b Co 1−a−b ) 1−c L c O 2 , where 0.1≦a≦0.5, 0.2≦b≦0.4, 0.003<c≦0.05, 1≦d≦1.05, and L is at least one selected from the group consisting of Y, Zr and Mo.
1 . A non-aqueous electrolyte secondary battery comprising a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, a separator and a non-aqueous electrolyte,
wherein said positive electrode active material comprises a nickel-containing composite oxide represented by the following formula (1):
Li d (Ni a Mn b Co 1−a−b ) 1−c L c O 2 ,
where 0.1≦a≦0.5, 0.2≦b≦0.4, 0.003≦c≦0.05, 1≦d≦1.05, and L is at least one selected from the group consisting of Y, Zr and Mo.
2 . The non-aqueous electrolyte secondary battery in accordance with claim 1 ,
wherein said positive electrode active material further comprises a magnesium-containing composite oxide represented by the following formula (2):
Li d Co 1−x Mg x O 2 ,
where 0.005≦x≦0.1 and 1≦d≦1.05.
3 . The non-aqueous electrolyte secondary battery in accordance with claim 2 ,
wherein the weight A of said nickel-containing composite oxide and the weight B of said magnesium-containing composite oxide satisfy the following relation:
0.3 ≦A /(A+B)≦0.5.
4 . A system comprising the non-aqueous electrolyte secondary battery in accordance with claim 1 and a charger for charging said non-aqueous electrolyte secondary battery,
wherein the end-of-charge voltage in said charger is set to 4.25 to 4.50 V.