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Anthraquinone‐Based Oligomer as a Long Cycle‐Life Organic Electrode Material for Use in Rechargeable Batteries
Author(s) -
Yao Masaru,
Sano Hikaru,
Ando Hisanori,
Kiyobayashi Tetsu,
Takeichi Nobuhiko
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201900012
Subject(s) - trimer , monomer , oligomer , chemistry , anthraquinone , electrolyte , redox , dimer , electrode , dissolution , covalent bond , polymer , polymer chemistry , chemical engineering , inorganic chemistry , organic chemistry , engineering
An anthraquinone (AQ)‐based dimer and trimer linked by a triple bond (−C≡C−) were newly synthesized as active materials for the positive electrode of rechargeable lithium batteries. These synthesized oligomers exhibited an initial discharge capacity of about 200 mAh g −1 with an average voltage of 2.2–2.3 V versus Li (C.E.) . These capacity values are similar to that of the AQ‐monomer, reflecting the two‐electron transfer redox per AQ unit. Regarding their cycling stability, the capacity of the monomer electrode quickly decreased; however, the electrodes of the prepared oligomers showed an improved cycling performance. In particular, the discharge capacities of the trimer remained almost constant for 100 cycles. A theoretical calculation revealed that the intermolecular binding energy can be increased to the level of a weak covalent bonding by oligomerization, which would be beneficial to suppress the dissolution of the organic active materials into the electrolyte solutions. These results show that the cycle‐life of organic active materials can be extended without lowering the discharge capacity by the oligomerization of the redox active molecule unit.