Pengcheng Sun1 Paul Braun1

1, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States

Here we show a two-step electrodeposition process to fabricate a high volumetric and areal capacity 3D-structured Sn/C anode starting from a commercial mesostructured thick 3D Ni scaffold. An anode with 20% Sn loading exhibits a volumetric/areal capacity of ∼879 mAh/cm3 and 6.59 mAh/cm2 after 100 cycles at 0.5C and a good half-cell rate performance of about 750mAh/cm3 and 5.5 mAh/cm2 (charge) at 10C. The 3D Sn/C anodes also show good compatibility with commercial LCO cathodes. EIS and finite element simulation are applied to verify the effects of Sn loading and carbon coating on the cycling and power performance of the 3D Sn/C anodes. We find that while higher loadings of Sn will cause a larger capacity decay with cycling, the addition of the carbon coating significantly improves the structural stability of the 3D-structured anodes. The combination of the high volumetric and areal capacity these anodes provide may make them of interest for next generation energy storage systems.