The composite LFP (c-LFP) and LMO (c-LMO) electrodes were prepared by mixing LFP or LMO powder, Super C65 and our prepared SPE20:1:1 as the binder in 80:10:10 wt% in acetonitrile. The slurry was mixed until smooth and cast using a doctor-blade on carboncoated aluminium foil. The obtained c-LFP and c-LMO electrodes have an average cathode mass loading of 2.5 and 3 mg cm -2 and an areal capacity of 0.46 and 0.45 mAh cm -2 , respectively. The composite cathodes were then cut into 8 mm diameter discs and vacuumdried at 50 °C for 24 h prior to cell assembly.