Unsymmetrically substituted quaterthiophenes with two terminal ferrocenyl groups were prepared as long π-conjugated systems. Anisotropy of the chemical structures of the π-conjugated systems was in...
Abstract Electrode protection additives for acetonitrile (AN)‐containing electrolytes play an important role for the usability of such electrolytes since it is decomposed reductively and electrochemically on the negative electrode of lithium‐ion batteries. The durability of electrolytes containing AN with low concentration of lithium salt was investigated by electrochemical measurements to achieve the desired battery performance derived from high ionic conductivity. The reductive decomposition of AN was suppressed by adding vinylene carbonate and ethylene sulfite as solid electrolyte interface formation additives. The high temperature durability performance with various positive electrode chemistries was improved by applying pyridine as a stabilizer for LiPF 6 . The AN‐containing electrolyte enhances low temperature performance and long‐term performance at high temperatures due to higher molecular mobility and a low electrode interface barrier. This electrolyte not only increases the capacity by enabling the usage of thicker electrodes, but also reduces the total cost of battery production.
Abstract An unsymmetrically substituted quaterthiophene with two terminal ferrocenyl groups was prepared as a long π-conjugated system. Electrochemical and spectroscopic studies were carried out to evaluate the electronic and/or electrostatic communication between the two terminals. The one-electron oxidation would occur at one ferrocene moiety specified due to the unsymmetry of the oligothiophene moiety. The one-electron oxidizing species extended into the oligothiophene moiety apparently interacts with the other terminal ferrocene moiety.
