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SnO2@a-Si core-shell nanowires on free-standing CNT paper as a thin and flexible Li-ion battery anode with high areal capacity

Abnavi, A ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1088/1361-6528/aa715b
  3. Publisher: Institute of Physics Publishing , 2017
  4. Abstract:
  5. Here, we report 3D hierarchical SnO2 nanowire (NW) core-amorphous silicon shell on free-standing carbon nanotube paper (SnO2@a-Si/CNT paper) as an effective anode for flexible lithium-ion battery (LIB) application. This binder-free electrode exhibits a high initial discharge capacity of 3020 mAh g-1 with a large reversible charge capacity of 1250 mAh g-1 at a current density of 250 mA g-1. Compared to other SnO2 NW or its core-shell nanostructured anodes, the fabricated SnO2@a-Si/CNT structure demonstrates an outstanding performance with high mass loading (∼5.9 mg cm-2), high areal capacity (∼5.2 mAh cm-2), and large volumetric capacity (∼1750 mAh cm-3) after 25 cycles. Due to the incorporation of CNT paper as the current collector, the weight and thickness of the total electrode is effectively reduced with respect to the conventional LIB anodes. The fabricated electrode has a total thickness of only 30 μm and considering the total weight of the electrode (active mass + current collector), an initial discharge/charge capacity of 2460/1018 mAh g-1 is obtained. Hence, this thin, lightweight and highly flexible structure is proposed as an excellent candidate for high-performance LIB anode materials, especially in flexible electronics. © 2017 IOP Publishing Ltd
  6. Keywords:
  7. Flexible lithium-ion battery anode ; Paper ; free-standing substrate ; SnO2/Si core-shell ; Amorphous carbon ; Amorphous silicon ; Anodes ; Carbon ; Carbon nanotubes ; Electric batteries ; Electric current collectors ; Electric discharges ; Electrodes ; Flexible electronics ; Flexible structures ; Ions ; Lithium ; Nanowires ; CNT paper ; Secondary batteries ; Shells (structures) ; Silicon ; Yarn ; Charge capacities ; Core shell ; Core-shell nanowires ; Free standing substrates ; Initial discharge capacities ; Lithium-ion battery anodes ; Nanostructured anodes ; Volumetric capacity ; Lithium-ion batteries ; Batteries ; Carbon Fibers ; Carbon Papers ; Current Density
  8. Source: Nanotechnology ; Volume 28, Issue 25 , 2017 ; 09574484 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/1361-6528/aa715b/meta