Modulating interphasial chemistry through PEI/PI separator coating for thermally robust high-voltage batteries (IMAGE)

Tsinghua University Press

Modulating interphasial chemistry through PEI/PI separator coating for thermally robust high-voltage batteries

Caption

A trilayer polyetherimide (PE)-Al2O3-polyetherimide/polyimide (PEI/PI) separator, namely PAP, is designed for high-voltage and high-temperature lithium-ion batteries. The outer PEI/PI coating layer regulates the interfacial solvation structure of Li+ and facilitates desolvation, enabling the formation of a robust and thermally stable cathode–electrolyte interphase. The intermediate Al2O3 ceramic layer enhances electrolyte affinity and structural integrity. This synergistic architecture endows the LiCoO2 cathode with exceptional cycling stability at 4.6 V and 60°C.

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Energy Materials and Devices, Tsinghua University Press

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