| abstract |
It is an object of the present invention to provide an additive for a lithium secondary battery that improves battery capacity and initial efficiency of a lithium secondary battery.n n n In the present invention, the fullerene derivative having a group having a formula weight of 6 or more is used as an additive for a lithium secondary battery. The fullerene derivative having a group having a formula weight of 6 or more is contained in a lithium secondary battery using an anode material for a lithium secondary battery, an anode for a lithium secondary battery, and an anode containing the anode material. The group having a formula weight of 6 or more in fullerene is composed of an alkali metal atom, a chalcogen atom, a halogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a heterocyclic group, an oxygen containing group, a sulfur containing group and a nitrogen containing group It is preferable that it is one selected from group. |