Electrochemical Preparation of Poly(N‐anthraquinoyl pyrrole) as High‐Performance Cathode Materials for Organic Lithium‐Ion Batteries

Abstract

Anthraquinone and its derivatives show compelling electrochemical activities in lithium‐ion batteries due to their abundant redox‐active carbonyl groups and desirable π‐conjugated structures. However, anthraquinone‐based compounds often suffer from inferior material utilization, a low‐capacity retention rate, and short cycle life due to poor conductivities and unexpected dissolution properties in supporting electrolytes during the charge/discharge cycles. To solve these problems, a novel grafted polymer, poly(N‐anthraquinoyl pyrrole) (e‐PAQPy), containing redox‐active anthraquinone subunits and conductive polypyrrole groups, is prepared by an electrochemical polymerization method and employed as the cathode material for organic lithium‐ion batteries. Polypyrrole backbone chain in e‐PAQPy is utilized both to bring into high electronic conductivity and to decrease the solubility of the anthraquinone subunits. As expected, the e‐PAQPy exhibits a high specific capacity (196.2 mAh g−1 at 0.1 C), good rate performance (70.8 mAh g−1 at 3 C), and long cycle stability (79% of the initial capacity after 500 cycles).

Imino-Linked Carbonyl-Enriched Polymer as a High-Performance Cathode Material for Lithium-Ion Batteries

“…The PDABQ battery demonstrates a remarkable maximum energy density of 431.49 Wh kg –1 and still maintains a high energy density of 334.78 Wh kg –1 even at a high-power density of 4156.2 W kg –1 . Notably, the energy-power performance of PDABQ is superior among the published carbonyl-based cathode materials for LIBs (Figure e). ,− The electrochemical impedance spectroscopy (EIS) plot of the PDABQ cathode is shown in Figure g. The pristine cathode exhibits a charge transfer resistance ( R ct ) of 144 Ω for PDABQ, contributing to the enhanced charge transport capability of the PDABQ cathode.…”

Modified polydopamine derivatives as high-performance organic anodes for potassium-ion batteries

“…10–12 Excellent redox properties and electrochemical performance can be achieved by modifying the functional groups and the structure. 13,14 In the past few decades, various organic electrode materials have been extensively investigated, for example, conductive polymers, 15,16 organic carbonyl compounds, 17,18 organosulfur compounds, 19,20 and organic free-radical compounds. 21,22 Although organic electrodes possess several inherent advantages over inorganic materials, their development is still hindered by several factors, such as the majority of the organic molecules are highly soluble in organic electrolytes, and thus the cycling stability is obviously reduced.…”