Expanded graphite as superior anode for sodium-ion batteries View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2014-12

AUTHORS

Yang Wen, Kai He, Yujie Zhu, Fudong Han, Yunhua Xu, Isamu Matsuda, Yoshitaka Ishii, John Cumings, Chunsheng Wang

ABSTRACT

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 Å 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 284 mAh g(-1) at a current density of 20 mA g(-1), maintain a capacity of 184 mAh g(-1) at 100 mA g(-1), and retain 73.92% of its capacity after 2,000 cycles. More... »

PAGES

4033

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ncomms5033

DOI

http://dx.doi.org/10.1038/ncomms5033

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1036770578

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24893716


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