Aromatic Carbonyl Derivative Polymers as High-Performance Li-Ion Storage Materials

摘要

The reversible redox enolation of carbonyl groups that conjugate with aromatic structures provides a promising energy-storage system for positive-electrode materials in Li-ion batteries, and the large increase in electronic conductivity can efficiently improve the cycling stability. For PTCDA and sulfide polymers, oxygen atoms between the two carbonyl groups of the anhydrides do not contribute to the electrochemical performance; therefore, it can be inferred that omitting these atoms will result in higher specific capacity. These results give important insights into developing a new generation of organic positive-electrode materials with higher capacity performance and stability through designing and optimizing the molecular structures of the aromatic-derivative-based conductive polymers. Because of the excellent electrochemical performance and the design diversity of the molecular structure, as well as advantages including, amongst others, high safety, these materials may possess broader application prospects than the conventional transition-metal-oxide-based materials.