Fig. 1: Copper-ion intercalation in VS2.
From: Reversible multivalent carrier redox exceeding intercalation capacity boundary
a XRD pattern of VS2. b Structural investigations of ion intercalations, including magnesium, zinc, and copper. c Galvanostatic charge‒discharge (GCD) curve and (d), cycling performance of f-VS2 electrodes with copper intercalation at 0.4 A g-1. e Comparison with the capacity of reported VS2 cathodes to date. VS2 cathodes for monovalent-ion batteries and multivalent-ion batteries are distinguished by blue and red colour blocks, respectively. f Cycling performance of f-VS2 electrodes with copper intercalation at 10 A g−1. g GCD curves and corresponding V K-edge o-XAFS data in (h), deintercalation (charging) and (i), intercalation (discharging). The right-side images show the magnified XANES region. j EXAFS evolution inferred from o-XAFS data. The red and blue dashed lines mark the V‒S peak positions for the fully discharged and fully charged states, respectively.
