C@MoS2@PPy sandwich-like nanotube arrays as an ultrastable and high-rate flexible anode for Li/Na-ion batteries
By Lu, Bin; Liu, Jun; Hu, Renzong; Wang, Hui; Liu, Jiangwen; Zhu, Min
Published in Energy Storage Materials
2018
Abstract
Flexible electrode with robust mechanical and electrochemical property is crucial for thin film battery technology, especially in deformable electronics. In present work, a self-supported C@MoS2@PPy sandwich-like nanotube arrays (SNTAs) have been engineered and synthesized on steel substrate through a simple template-based approach and further employed as freestanding anode for Li/Na-ion batteries. For the C@MoS2@PPy SNTAs, ultra-thin MoS2 nanosheets are uniformly covered with conductive polypyrrole (PPy) and synchronically deposited on the carbon submicron tube arrays (CSTAs) which is vertically grown on the substrate. The conductive tubular array-type CSTAs skeleton and outer PPy coating not only endow the SNTAs with superior e-/ion conduction, but also preserve the framework stability when complete volumetric swelling occur in MoS2. As a result, such SNTAs electrode show a robust lithium storage (1050 mA h g?1 at 200 ?A cm-2/805 mA g-1 over 600 cycles and a rate property of 630 mA h g-1 at 1000 ?A cm-2/4027 mA g-1) and also impressive sodium storage (615 mA h g?1 at 50 ?A cm-2/201 mA g-1 over 200 cycles and a rate property of 405 mA h g-1 at 250 ?A cm-2/1007 mA g-1). These freestanding SNTAs electrode exhibit its promising future in deformable energy storage technologies.
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