fig2

Figure 2. (A) Galvanostatic intermittent titration technique (GITT) curves of graphite at C/10. (B) Galvanostatic potassiation/depotassiation (GPD) profiles of graphite for the initial two cycles at C/40. (C) Ex-situ XRD patterns of (de-)potassiation of graphite corresponding to the voltage points in (D). (D) The first charge-discharge curve of graphite at C/10. (E) Schematic diagram of different K-GICs. Copyright 2015, American Chemical Society^[9].