A Polythiophene Material Featuring a Conjugated Carbonyl Side Group as an Anode for Lithium‐Ion Batteries

Abstract

Converting small organic molecules to their lithium salts or polymerization effectively solves the capacity fading caused by the dissolution of small organic molecules in electrolytes. While polymer lithium salts have the characteristics of small molecular lithium salts and polymers and can obtain good cycle stability and rate performance. The 3‐carboxylithium substituted thiophene (3‐TCOOLi) and polymer (P3‐TCOOLi) anode materials for lithium‐ion batteries were synthesized, and their electrochemical properties were compared. Compared with the small‐molecule lithium salt 3‐TCOOLi electrode, the polymer P3‐TCOOLi electrode exhibits superior cycling and rate performance. The P3‐TCOOLi electrode still has a specific capacity of 390 mAh g−1 after 100 cycles at a current density of 50 mA g−1. During the rate charge and discharge process, when the current density increased to 1000 mA g−1, the specific capacity was 305 mAh g−1. It shows that the idea of small molecule lithium salt polymerization is feasible.

One-Dimensional Croconate-Based Fe-CP as a High-Performance Anode Material for Lithium–Ion Batteries

“…This strategy offers the advantage of preserving the substantial capacities associated with organic components, also mitigating solubility concerns in the electrolyte through the establishment of ionic bonds. Thus far, extensive research has been accompanied with a range of organic carbonyl salts that exhibit significant theoretical capacities for use in rechargeable LIBs [ 27 , 28 ]. Nevertheless, solubility remains a significant concern that requires resolution.…”