Fig. 2: PP and PPMA with varying ratios of PSS and PMA.

a, b Molecular structure and 1H-NMR spectra (a), and FTIR spectra of P(SSx-co-MAy) (b). c, d 2D GIWAX patterns of PP and PPMAs films (c) and their corresponding out-of-plane intensity profiles (d). e Cyclic voltammograms between 0.01 and 1.00 V (vs. Li/Li+) at 0.1 mV s−1 and 30 °C. f e− conductivities before and after the CV measurements in LE and SE cells. g Ex situ S 2p XPS spectra before and after the CV measurements from the same electrodes as in Fig. 2c.