Kadijaale
Joined: 29 Jun 2013
Posts: 5
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 Posted: Sat Jun 29, 2013 8:31 am Post subject: Graphene nanoribbons could double Li-ion battery capacity |
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Rice University researchers have used ribbons of graphene to boost the efficiency of lithium ion batteries.
The nanoribbons, when combined with a tin oxide solution, have been shown to double the capacity for lithium compared to standard anodes used in current commercial batteries.
"After 50 charge/discharge cycles, the test units retained a capacity that was still more than double that of the graphite currently used for lithium battery anodes," noted Rice chemist James Tour.
Tour and his colleagues developed a method for unzipping nanotubes into graphene nanribbons, or GNRs, in 2009. Since then, they have found a way to make them in bulk and are moving toward commercial applications.
In the new experiments, the team mixed GNRs with tin oxide particles about 10nm wide with a cellulose gum binder and a bit of water. They then spread this on a current collector and encased it in a button style battery. Not only did the GNRs separate and support the tin oxide, they also helped deliver Li-ions to the nanoparticles.
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