Extended Data Fig. 5: Stability of the gel electrolyte–graphite interface.
From: High-performance fibre battery with polymer gel electrolyte
a–c, Raman mapping images of the gel electrolyte and graphite particles with the FLB in the uncharged state at 3.0 V, half charged state at 3.9 V and a fully charged state at 4.4 V. d,e, Raman mapping images of the gel electrolyte and graphite particles after the FLB was stored at −40 °C and 80 °C for 1 h, respectively. f, Magnified area of the gel electrolyte–graphite interface. g, Corresponding Raman shifts of the graphite particles at 3.0 V, 3.9 V, and 4.4 V. The characteristic peaks of graphite at 1,350 cm−1 and 1,580 cm−1 varied for the different charged states. a.u., arbitrary units. Scale bars, 3 μm (a–e); 1 μm (f).
