Patent No. EP3930047A1


Mikel Arrese-Igor (CIC energiGUNE), Maria Martinez Ibañez (CIC energiGUNE), Michel Armand (CIC energiGUNE), Frederic Aguesse (CIC energiGUNE), Pedro Lopez-Aranguren (CIC energiGUNE), Devaraj Shanmukaraj (CIC energiGUNE), Erwan Dumont (SAFT)


Poly(ethylene oxide) (PEO)-based electrolytes are the most commonly used in commercial Li-metal based solid-state batteries (SSBs). However, its use with high-voltage positive electrodes remains a challenge due to the limited electrochemical stability of PEO.

Researchers at CIC energiGUNE have developed a solid-state battery including two different polymer electrolytes, one as solid polymer electrolyte (SPE), and the other as solid polymer catholyte (SPC; electrolyte within the cathode). The SPE is a polymer compatible with Li-metal, while the SPC is suitable for high-voltage active materials. The combination of both polymers on the same device is only feasible using a single-ion conducting salt.

Added value

  • Possibility of a combination of different polymers in the same electrochemical device

  • High voltage operation is enabled

Application of the technology

  • Li metal polymer batteries

  • Post lithium solid-state batteries

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