Applications of Zwitterions and Zwitterionic Polymers for Li-Ion Batteries

A zwitterion is a neutral compound that has both a cation and an anion in the same molecule. Quaternary ammonium cations are frequently used for zwitterions. Zwitterions with quaternary ammonium cations are also common in biological molecules, such as phospholipids, which are the main components of cell membranes. Chemically, they have broad applicability because they are dielectric, non-volatile, and highly polar compounds with a large dipole moment. In addition, after salt addition, ion exchange does not occur in the presence of zwitterions. Owing to these characteristics, zwitterions have been applied as novel electrolyte materials targeting high ionic conductivity. In this review, application of zwitterions and their polymers for Li-ion batteries is addressed.

Automated summary

A zwitterion is a neutral compound with both a cation and an anion. Quaternary ammonium cations are commonly used for zwitterions and are also found in biological molecules like phospholipids. Zwitterions are dielectric, non-volatile, highly polar, and have a large dipole moment, making them versatile. They have been applied as electrolyte materials for high ionic conductivity in Li-ion batteries.