Changes in the resistance of electrolyte solutions during contact with lithium electrodes at open circuit potential that reflect the Li surface chemistry

摘要

Li electrodes were freshly prepared in a variety of alkyl carbonate solutions, including DMC, EC-DMC and EC-DEC mixtures, containing LiAsF_6, LiPF_6 and LiBF_4 as the salts, and H_2O, HF and tributylamine as the contaminants/additives. The solutions' resistance, measured by impedance spectroscopy, changes systematically during contact with the Li electrodes (at open circuit potential), as a function of the solution composition and the salt, additives and solvent ratio. These changes inthe solutions' resistance are discussed in light o fthe complicated surface chemistry of the Li electrodes in the solutions, which slightly affect the content of the conduting species in solutions.