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Talk on “Na-Ion Batteries for Grid-Scale Energy Storage”
Friday 23rd June 2017 @ 2:00 pm - 3:00 pm
Prof Yong Sheng Hu of the Institute of Physics, Chinese Academy of Sciences, is an Advanced Newton Fellow in Prof. Titirici’s group at Queen Mary University of London. He will give a talk on Friday 23 of June@2pm in Joseph Priestley Building, 3-rd Floor, Nanoforce Seminar Room, Queen Mary University of London, Mile End Campus.
Abstract: With the tremendous development of renewable energies such as solar and wind powers, the smooth integration of their energies into the grid, thus improving the grid reliability and utilisation, critically needs large-scale energy storage systems with long life, high efficiency, high safety and low cost. Among the various energy storage technologies, electrochemical approach represents one of the most promising means to store the electricity in large-scale because of the flexibility, high energy conversion efficiency and simple maintenance. Lithium-ion batteries have been explored as power sources for various types of important applications, such as portable electric devices and electrical vehicles. However, the rarity and non-uniform distribution of lithium in the Earth’s crust may not simultaneously support these two important application areas: electric vehicles and renewable energy. Alternatively, Na-ion batteries have been reconsidered particularly for renewable energy, where cost and cycle life are more critical factors than energy density due to the abundant sodium resources and low cost as well as similar “rocking-chair” Na storage mechanism as Li. Furthermore, we can use Na+ ions as the charge carrier to explore new chemistry and new materials to further decrease the cost. For example, Na cannot form the alloy with Al, therefore Al foil can be used as the current collector for the anode without the overdischarge problem. In this talk, I will focus on a series of Na-Cu-Fe-Mn-O cathode and a superior low cost amorphous carbon anode made from renewable biomass and coal. Based on the above results, prototype Na-ion cells were constructed. I will also show the electrochemical and safety performance of Na-ion pouch cells. Finally, the materials cost of the Na-ion pouch cell is estimated and compared with LiFePO4/graphite systems.