Abstract
The Co/SnO2 core-shell nanowire arrays were synthesized via a simple hydrothermal approach and subsequently the deposition of amorphous SnO2 layer. When used as anode materials of lithium-ion batteries, the Co/SnO2 core-shell nanowire arrays maintain at 667.9 mAh g−1 with the capacity retention of 85.7% after 100 cycles at the current density of 200 mA g−1. For comparison, the discharge capacity of the planar SnO2 electrodes shows the capacity of 196.3 mAh g−1 with the capacity retention of 22.6% after 100 cycles under the same condition. The enhanced electrochemical performance is attributed to the core-shell array nanostructures that can improve the conductivity and buffer the volume changes of tin-based anode during the charge/discharge process.
Highlights
The increasing development of portable electronic equipment and electric vehicles puts forward high requirements for the performance of lithium-ion batteries
We demonstrate Co/SnO2 core-shell nanowire arrays with Co nanowires as the current collector and SnO2 as the active material
There is a reduction peak at ~ 0.8 V, which is related to the decomposition of lithium oxide and the formation of solid electrolyte interface (SEI) layer [41], while the broader peak between 0.1~0.5 V corresponds to the alloying reaction process of Li and Sn, as shown in the reaction Formula (1): Fig. 4 SEM images of threedimensional electrodes with a sputtering SnO2 time of 5 min (a), 10 min (b), 15 min (c), and 20 min (d) at the current density of 200 mA/g
Summary
The increasing development of portable electronic equipment and electric vehicles puts forward high requirements for the performance of lithium-ion batteries. SnO2 deposited on the Co nanowires has a high specific surface area, which increases the contact area of electrode/ electrolyte, and reserves good strain accommodation for anode materials during charge-discharge cycles.
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