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Towards reducing carbon content in silicon/carbon anodes for lithium ion batteries.
- Source :
-
Carbon . Feb2017, Vol. 112, p72-78. 7p. - Publication Year :
- 2017
-
Abstract
- Conducting carbon is added to electrodes of lithium ion batteries (LIBs) to provide electrical conductivity. Because this carbon does not contribute to capacity, there is a drive towards decreasing its content with a goal of lowering the mass of the electrode. Reduced graphene oxide (RGO) has a high electrical conductivity, and is a potential alternative to traditionally used conductive carbon black (CB) in anodes for LIBs. Because of its high aspect ratio, RGO is expected to form a conducting network at lower volume loadings than CB. We report the use of this concept to significantly reduce carbon loading in silicon-carbon anodes for LIBs formed by emulsion-templating. Anodes with 1 wt% RGO and 14 wt% CB (15 wt% total carbon) showed specific capacities and capacity retentions that were comparable to anodes with 30 wt% CB with or without RGO. The capacity retention was significantly lower for anodes with 15 wt% total carbon that had no RGO. Cryo-SEM and SEM images, and electrochemical impedance spectroscopy, confirmed the formation of a conducting carbon network at 15 wt% total carbon loading when 1 wt% of the CB was replaced with RGO, and the lack of a well-connected network without the RGO. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00086223
- Volume :
- 112
- Database :
- Academic Search Index
- Journal :
- Carbon
- Publication Type :
- Academic Journal
- Accession number :
- 120050354
- Full Text :
- https://doi.org/10.1016/j.carbon.2016.10.058