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MIT Group May Have Solved The Liquid Sodium Battery Conundrum
"A battery that uses a liquid sodium electrode was first proposed in 1968. While revolutionary in theory, in practice it required a specialized membrane manufactured from ultra thin ceramic material to keep the components of the battery separated. Not only was the ceramic membrane expensive to manufacture, it was also exceedingly brittle, making it impractical for real world use."
https://cleantechnica.com/2018/01/26/mit-group-may-solved-liquid-sodium-battery-conundrum