| abstract |
In a lithium ion secondary battery, the positive electrode contains a lithium composite oxide, and has the general formula (1): Li x M 1 - y L y O 2 (M is at least one member selected from the group consisting of Ni and Co, L is at least one selected from the group consisting of transition elements other than alkaline earth elements, Ni and Co, rare earth elements, group IIIb elements and group IVb elements, 0.85 ≦ x ≦ 1.25, 0 ≦ y ≦ 0.50). . The lithium composite oxide is treated with a coupling agent having a plurality of hydrolyzable groups, and the remaining hydrolyzable groups are inactivated. |