How Do Liquid Metal Batteries Utilize Chemical Reactions for Energy Storage?

[DrZoidberg]

http://www.msnbc.msn.com/id/29900981/
"One of the first compilations used molten antimony and magnesium as the charge holders with a layer of sodium sulfide between the two."How does this work?
What chemical reaction is taking place between the metals and the salt?

 

[Borek]

http://www.ecovoice.com.au/eco-news/eco-news-issue-73-may-2010/343-smaller-harder-faster-and-cleaner-batteries-fuel-cells-and-energy-storage-of-the-future-is-coming-to-a-community-and-classroom-near-you

Scroll down or search the text for magnesium antimonide.

--