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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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A phosphorene–graphene hybrid material as a high-capacity anode for sodium-ion batteries

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Title
A phosphorene–graphene hybrid material as a high-capacity anode for sodium-ion batteries
Author
Sun, JieLee, Hyun-WookPasta, MauroYuan, HongtaoZheng, GuangyuanSun, YongmingLi, YuzhangCui, Yi
Keywords
SOLID-ELECTROLYTE INTERPHASE; BLACK PHOSPHORUS; RECHARGEABLE BATTERIES; NEGATIVE ELECTRODE; LITHIUM-ION; COMPOSITE; INSERTION; GRAPHITE; STORAGE; RAMAN
Issue Date
2015-11
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE NANOTECHNOLOGY, v.10, no.11, pp.980 - 985
Abstract
Sodium-ion batteries have recently attracted significant attention as an alternative to lithium-ion batteries because sodium sources do not present the geopolitical issues that lithium sources might. Although recent reports on cathode materials for sodium-ion batteries have demonstrated performances comparable to their lithium-ion counterparts, the major scientific challenge for a competitive sodium-ion battery technology is to develop viable anode materials. Here we show that a hybrid material made out of a few phosphorene layers sandwiched between graphene layers shows a specific capacity of 2,440â �...mAâ �...hâ �...g â '1 (calculated using the mass of phosphorus only) at a current density of 0.05â �...Aâ �...g â '1 and an 83% capacity retention after 100 cycles while operating between 0 and 1.5â �...V. Using in situ transmission electron microscopy and ex situ X-ray diffraction techniques, we explain the large capacity of our anode through a dual mechanism of intercalation of sodium ions along the x axis of the phosphorene layers followed by the formation of a Na 3 P alloy. The presence of graphene layers in the hybrid material works as a mechanical backbone and an electrical highway, ensuring that a suitable elastic buffer space accommodates the anisotropic expansion of phosphorene layers along the y and z axial directions for stable cycling operation.
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DOI
10.1038/nnano.2015.194
ISSN
1748-3387
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ECHE_Journal Papers
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