Surface‐modified polyethylene separator with hydrophilic property for enhancing the electrochemical performance of lithium‐ion battery

Abstract

The suggested surface treatment using ammonium persulfate (APS) successfully introduces hydrophilic functional groups onto the microporous structure of the polyethylene (PE) separators, leading to a high affinity toward polar liquid electrolytes without degrading the intrinsic physical properties of the separator. This improves the lithium-ion migration and ionic conductivity of the APS-treated separator, affording a stable cycle performance (92.5% at 90th cycle) and significantly improved rate capability (87.5% at 3 C).

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