Bibliographic Details
| Title: |
Ultrafast Solvent-Assisted Sodium Ion Intercalation into Highly Crystalline Few-Layered Graphene. |
| Authors: |
Cohn, Adam P.1, Share, Keith2, Carter, Rachel1, Oakes, Landon2, Pint, Cary L.1,2 cary.l.pint@vanderbilt.edu |
| Source: |
Nano Letters. Jan2016, Vol. 16 Issue 1, p543-548. 6p. |
| Subjects: |
Solvents, Intercalation reactions, Graphene, Sodium ions, Raman spectroscopy |
| Abstract: |
A maximum sodium capacity of ~35 mAh/g has hampered the use of crystalline carbon nanostructures for sodium ion battery anodes. We demonstrate that a diglyme solvent shell encapsulating a sodium ion acts as a "nonstick" coating to facilitate rapid ion insertion into crystalline few-layer graphene and bypass slow desolvation kinetics. This yields storage capacities above 150 mAh/g, cycling performance with negligible capacity fade over 8000 cycles, and ~100 mAh/g capacities maintained at currents of 30 A/g (~12 s charge). Raman spectroscopy elucidates the ordered, but nondestructive cointercalation mechanism that differs from desolvated ion intercalation processes. In situ Raman measurements identify the Na+ staging sequence and isolates Fermi energies for the first and second stage ternary intercalation compounds at ~0.8 eV and ~1.2 eV. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
