Electrochemical Insertion of Sodium into Carbon

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Abstract
Electrochemical insertion of sodium ions into carbon using solid polymer electrolytes or organic liquid electrolytes is described. Cells with the configuration ) or Na/liquid electrolyte/C were galvanostatically discharged, charged, and cycled. The extent of insertion into C (i.e., ) was found to be a strong function of the type and particle size of the carbon used, and the reversibility of the process was highly dependent upon the type of electrolyte used. The possibility of designing a sodium ion rocking chair cell is discussed, and a first‐generation example, using a petroleum coke anode, polymer electrolyte, and sodium cobalt bronze cathode is described.

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