A high-energy room-temperature sodium-sulfur battery.

Xin, Sen; Yin, Ya-Xia; Guo, Yu-Guo; Wan, Li-Jun · Adv Mater · 2014

basic_science · Level V

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Abstract

Employing small sulfur molecules as the active cathode component for room-temperature Na-S batteries, reveals a novel mechanism that is verified for the batteries' electrochemistry. The sulfur cathode enables a complete two-electron reaction to form Na2 S, bringing a tripled specific capacity and an increased specific energy compared with traditional high-temperature Na-S batteries. At the same time, it offers better cycling stability endowing the batteries with a longer lifespan.