Published on September 14th, 2011 | by Nicholas Brown


Seaweed Gives Scientists an Idea for Improved Batteries

September 14th, 2011 by  

Lithium-ion batteries could store ten times as much energy per kg of batteries if they were constructed with silicon anodes (compared to traditional li-ion batteries). That is a gravimetric energy density of 1,000 watt-hours per kg. This could almost eliminate the range issue that electric vehicles have, but there is one problem:

Lithium-ion battery anodes absorb lithium ions, expanding during that process, and then contract as the lithium ions leave them. Silicon anodes crack and malfunction during this process because they cannot handle repeated expansion and contraction. This is due to the fact that silicon is brittle.

Researchers at the Georgia Institute of Technology and Clemson University say that they have discovered a way to manufacture li-ion batteries with silicon anodes by utilizing a substance sometimes used as a binding agent, gelling agent, and food additive, a substance derived from brown algae. << Ew.

The substance is alginate and it prevents the silicon anode from cracking and enables it to achieve 8 times the energy density of traditional li-ion batteries. This is one of multiple attempts to address this cracking problem. You can see how silicon nanowires helped to extend the life of this type of battery via this Stanford News piece from a few years ago.

The anode of a lithium-ion battery is where the “energy”/lithium ions are stored and, when electric current is being drawn from the battery, the lithium ions travel over to the cathode and generate that electric current while traveling.

h/t Technology Review

Image via Kristoferb


Check out our new 93-page EV report, based on over 2,000 surveys collected from EV drivers in 49 of 50 US states, 26 European countries, and 9 Canadian provinces.

Tags: , , , ,

About the Author

writes on CleanTechnica, Gas2, Kleef&Co, and Green Building Elements. He has a keen interest in physics-intensive topics such as electricity generation, refrigeration and air conditioning technology, energy storage, and geography. His website is:

  • tibi stibi

    i would be very interested in an overview of betteries for cars.

    what did we have in de past, where are we now and what can we prodict having in te future…

Back to Top ↑