abstract |
The present invention relates to a separation membrane for an electrochemical device, which prevents deterioration of cell performance due to metal ions by applying a polymer capable of adsorbing metal ions eluted from a cathode active material to a separation membrane for an electrochemical device, The present invention relates to a chemical device, in which metal ions eluted from a cathode active material are adsorbed so that they are no longer deposited on the surface of a cathode, and deterioration of the cell performance due to precipitation of metal ions on the surface of the cathode, Reduction in storage stability and the like can be effectively prevented. |