The invention discloses a formation method for a
lithium ion battery, which comprises the following steps of: 1, providing a
lithium ion battery, wherein the
lithium ion battery contains n
anode materials, n is not less than 2, the charging capacity of the first
anode material is set as C1,...the charging capacity of the n(th)
anode material is set as Cn, and the platform
voltage Vn of the n(th) anode material is greater than the platform
voltage Vn-1 of the n-1(th) anode material; and 2, performing constant-
current time-limiting charging on the
lithium ion battery by a current I1, performing constant-
current voltage-limiting charging on the
lithium ion battery by a current I1' and with a
cut-off
voltage V1', ...performing constant-
current voltage-limiting charging on the
lithium ion battery by a current In, and performing constant-
current voltage-limiting charging on the lithium ion battery by a current In' and with a
cut-off voltage Vn'. According to the formation method for the lithium ion battery disclosed by the invention, the formation current and time are set according to the respective platforms and nominal capacities of the mixed anode materials, so that the mixed anode materials can be adequately activated, and the capacity, cycle performance and thickness can be improved.