Li/LiCoO₂ in inorganic electrolyte solution

摘要

The results of half cell experiments with Li/LiCoO₂ ininorganic electrolyte solution indicate the stability, compatibility,and high rate capability of this system. The electrolyte solution has anacceptable conductivity of about 65 mS/cm at 25° C and can be used inthe range from -25 up to 70° C. Potentiodynamic cycling of the LiCoO₂ electrode between 3.5 and 4.5 V versus Li show power losswith capacity decrease of 0.3% per cycle. Charging up to 5 V results inno degradation of the CoO₂ electrode. In an overchargereaction Cl₂ was evolved reacting with components tocompatible products. The formation of Cl₂ at the Ni electrodewas shown by applying online electrochemical mass spectrometry. Lithiumcycle efficiencies of about 99% at 40 mA/cm² were achieved