Figure 3

(a) Rate capability of Ca2Ge7O16 hollow microspheres in different electrolytes at different current densities. (b) Cycling performance of Ca2Ge7O16 hollow microspheres in different electrolytes under a current density of 100 mA g−1. (c) Comparison of rate capability of Ca2Ge7O16 nanowires and Ca2Ge7O16 hollow microspheres at different current densities in electrolyte with EC/DMC/DEC (3/4/3) + 5 wt% FEC. (d) Comparison of cycling performance of Ca2Ge7O16 nanowires and Ca2Ge7O16 hollow microspheres under a current density of 100 mA g−1 in electrolyte with EC/DMC/DEC (3/4/3) + 5 wt% FEC.