STUDY OF CURRENT COLLECTORS FOR MG BATTERIES IN MG(ALCL2ETAU)2/THF ELECTROLYTE

摘要

Advanced batteries are in great demand not only for portable electronics, but also for large scale energy storage, especially with the emergence of electric vehicles and grid energy storage. Magnesium based batteries have attracted great interest due to its high theoretical specific capacity (2200 Ah kg-1) and is only 1/10 the price of Li with superior safety characteristics.1 Intensive research has been focused on the feasibility of rechargeable magnesium batteries, including new possible electrode materials and its Mg electrochemistry.2-4 However, challenges remain in the system due to the chemical complexity and lack of understanding of reversible deposition/dissolution of Mg, cathode hosts for Mg2+, electrolyte, and compatibility among them. It is well known that compatibility between the current collector and electrolyte is one of the key aspects of battery systems, especially for rechargeable batteries with long cycle life. Therefore, understanding the electrochemical behavior of current collectors and their stability in the battery system is critical for fundamental research and practical application of magnesium batteries and has received less attention to the best of our knowledge.