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. 2016 Jan 4;6:18626. doi: 10.1038/srep18626

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(a) Cycle performance of SnO₂/Cu foam, SnO₂ SG, and SnO₂ NPs at current rate of 0.5 C during 50 cycles and their coulombic efficiencies. (b) Differential capacity profiles of the SnO₂/Cu foam differentiated from the discharge voltage profile after the selected cycles. (c) Rate performance of the SnO₂/Cu foam at various C-rates from 0.1 C to 2 C. (d) Voltage profiles of the SnO₂/Cu foam at the final discharge/charge processes in each current rate step. (e) Comparison of capacity at different current rates for the SnO₂/Cu foam with other Sn-based anode materials reported in recent years. All the specific capacity and current rate are calculated based on the mass of SnO₂.