POLYMER CURRENT COLLECTOR, PREPARATION METHOD THEREFOR, AND SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK, AND APPARATUS RELATED THERETO

A polymer current collector, comprising a polymer film layer. The polymer film layer comprises a first polymer film layer and a second polymer film layer. The electrical resistivity of the first polymer film layer is denoted as ρ1. The electrical resistivity of the second polymer film layer is denoted as p2. The current collector satisfies: ρ1 > p2. The present polymer current collector is capable of inducing lithium metal deposition from a side having low electrical conductivity to a side having high electrical conductivity, avoiding the risk of lithium ion deposition on the surface of the current collector, thereby increasing the cycle life of a lithium metal battery..