DGIST Scholar: Enhanced cycle stability of polypyrrole-derived nitrogen -doped carbon-coated tin oxide hollow nanofibers for lithium battery anodes

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Enhanced cycle stability of polypyrrole-derived nitrogen -doped carbon-coated tin oxide hollow nanofibers for lithium battery anodes

Title: Enhanced cycle stability of polypyrrole-derived nitrogen -doped carbon-coated tin oxide hollow nanofibers for lithium battery anodes

Author(s): Pham-Cong, De ; Park, Jung Soo ; Kim, Jae Hyun ; Kim, Jinwoo ; Braun, Paul V. ; Choi, Jun Hee ; Kim, Su Jae ; Jeong, Se Young ; Cho, Chae Ryong

Keywords: Anodes ; Composite Architectures ; Doping (Additives) ; Electric Batteries ; Electrochemical Performance ; Electrode Material ; Electrodes ; Encapsulation ; GRAPHENE SHEETS ; HIGH-CAPACITY ; High-Performance Lithium-Ion Batteries ; Hollow Nanofibers ; Li-Ion Batteries ; Lithium-Ion Batteries ; Lithium Alloys ; Lithium Battery Anode ; Lithium Compounds ; Nanofibers ; NANOPARTICLES ; NANOSHEETS ; Nitrogen ; Nitrogen-Doped Carbons ; Nitrogen Atmospheres ; Polypyrroles ; Reversible Capacity ; SNO2 NANOCRYSTALS ; STORAGE ; SUPERCAPACITORS ; Tin Oxides

Abstract: SnO2 hollow nanofibers (SnO2 hNFs) are prepared through electrospinning and annealing processes. The polypyrrole layers coated onto the surface of the SnO2 hNFs are annealed in a nitrogen atmosphere. The nitrogen-doped carbon-coated SnO2 hNFs (SnO2/NC hNFs) are composed of SnO2 hNFs with a wall thickness of 60–80nm and a nitrogen-doped carbon layer ∼10nm thick. The nitrogen content in the carbon layer is approximately 7.95%. Owing to the nitrogen-doped carbon shell layers, the specific reversible capacity of SnO2/NC hNFs at a current density of 0.2Ag−1 after 100 cycles is 1648mAhg−1, which is 427% higher than that of (386mAhg−1) SnO2 hNFs. This strategy may open new avenues for the design of other composite architectures as electrode materials in order to achieve high-performance lithium ion batteries. © 2016 Elsevier Ltd