Nanotubes Extend Battery Life

nickynicky9doors writes: "University of North Carolina researchers have demonstrated they can extend battery life by replacing the usual graphite electrode in a common rechargeable battery with a nanotube. The TRN News article speaks to an increase in the amount of charge a battery can hold and so to an increase it's lifespan. Rolled-up sheets of carbon atoms, nanotubes ...'have twice the storage capacity [of] the graphite electrode...'. The timeline for production is put at 2 years."

Comments

Lifespan, recyclability, pollution

[Spamalamadingdong]

I think we can take it for granted that we'll find easy ways of making carbon nanotubes in ton quantities. But their usefulness for making batteries depends on other factors:

• How many cycles can they take before they have degraded by, say, 50%?
• How difficult are they to recycle or destroy?
• If they are released into the environment, do they pose a pollution hazard akin to the fine asbestos fibers which are known to cause lung disease?

None of those things were covered in the article, and they'd be very nice to know. If the nanotubes don't offer as good a lifespan as the proton polymer battery, or you'd have a health hazard if the fibers were dispersed, these things are not going to be the panacea they appear from the article.

Carbon-layering.

[Nyphur]

Well, with the carbon artificially layered like this, in concentric circles with tiny spaces between the layers, the constructions resulting from this would be an artificial circular graphite-type material. The extra electron storage would result from the sea of free-floating electrons between each layer, as in graphite.

Heard of soot? It's a health threat

[Spamalamadingdong]

it seems to me that since carbon nanotubes are, well, pure carbon that pollution is a non-issue.

Diesel soot is nearly pure carbon, but the PM10 class of particles into which the finest soot falls is strongly associated with hospital admissions from respiratory problems, as well as spikes in deaths. 500-nanometer (.5 micron) nanotubes sound like they're right in the size range where they'd be a serious threat.

Somehow I don't think that a solid block or sheet of polymer presents anything like the same threat from the battery being broken open.