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Dihydrophenazine‐Based Copolymers as Promising Cathode Materials for Dual‐Ion Batteries
Author(s) -
Obrezkov Filipp A.,
Somova Anna I.,
Fedina Elena S.,
Vasil'ev Sergey G.,
Stevenson Keith J.,
Troshin Pavel A.
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000772
Subject(s) - cathode , diphenylamine , materials science , copolymer , lithium (medication) , phenothiazine , chemical engineering , polymer , ion , potassium , dual (grammatical number) , energy storage , chemistry , composite material , organic chemistry , thermodynamics , medicine , art , power (physics) , physics , literature , pharmacology , engineering , metallurgy , endocrinology
Herein, two novel copolymers of dihydrophenazine with diphenylamine ( PDPAPZ ) and phenothiazine ( PPTZPZ ) are synthesized and investigated as cathode materials for dual‐ion batteries. Both polymers demonstrate high average discharge potentials (3.5–3.6 V) in lithium cells. The PDPAPZ //Li cells demonstrate impressive rate capability: specific capacities of 101 and 82 mAh g −1 are reached under galvanostatic charging and discharging at the high current densities of 5 and 20 A g −1 , respectively. The capacity retention of 86% and 34% after 100 and 25 000 cycles, respectively, features decent operational stability of the batteries. Furthermore, an encouraging energy density of 398 Wh kg −1 is achieved in potassium PDPAPZ //K cells. The obtained values place PDPAPZ on par with the best organic cathode materials for fast lithium and potassium batteries.