Alternative Future Energy Storage And Conversion Systems

780 WordsJul 8, 20154 Pages
Metal-air batteries have been intensively explored as an alternative future energy storage and conversion systems owing to their intrinsically high energy and power densities, the relatively mature research on air electrode, and cost effective composition of non-noble fuel electrode, as well as in response to the high energy demand for portable devices and electric vehicles even stationary power plants [1–5]. Of late, research into the metal-air techniques has been focused on Zn-air (~1,000 Wh kg-1), Li-air (~13,000 Wh kg-1), and Ge-air (~1,500 Wh kg-1) batteries because of its very high specific energy and energy density with open cell air cathode structure [3–6]. With these devices, however, the electrochemical energy could be stored in the stationary part as form of sacrificial metal anode. This distinct architecture would make a limitation approach for large-scale commercialization unless the anode can provide good electrochemical reversibility and high cyclic durability. As a feasible alternative to continuous operation, recently, a high temperature liquid metal-air energy storage cell (LMAESC) in conjunction with a solid oxide electrolyte has been investigated applying post-transition metals such as In [7], Sn [7–17], Sb [18–25], Pb [7], and Bi [12] as a sacrificial electrode, so-called liquid metal anode (LMA). Since these liquid metals has relatively low melting point, it can improve the anode polarization by incorporating liquid wetting materials to spread on the
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