Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5033
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Funding
- Science of Nanostructures for Electrical Energy Storage, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
- NMR studies [NSF CHE-1310363]
- NISP Lab
- NSF MRSEC [DMR 05-20471]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1310363] Funding Source: National Science Foundation
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Graphite, as the most common anode for commercial Li-ion batteries, has been reported to have a very low capacity when used as a Na-ion battery anode. It is well known that electrochemical insertion of Na+ into graphite is significantly hindered by the insufficient interlayer spacing. Here we report expanded graphite as a Na-ion battery anode. Prepared through a process of oxidation and partial reduction on graphite, expanded graphite has an enlarged interlayer lattice distance of 4.3 angstrom yet retains an analogous long-range-ordered layered structure to graphite. In situ transmission electron microscopy has demonstrated that the Na-ion can be reversibly inserted into and extracted from expanded graphite. Galvanostatic studies show that expanded graphite can deliver a high reversible capacity of 284mAhg(-1) at a current density of 20mAg(-1), maintain a capacity of 184mAhg(-1) at 100mAg(-1), and retain 73.92% of its capacity after 2,000 cycles.
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