4.8 Article

Facile Synthesis of Polyphenothiazine as a High-Performance p-Type Cathode for Rechargeable Lithium Batteries

期刊

CHEMSUSCHEM
卷 14, 期 15, 页码 3174-3181

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202101008

关键词

electrode materials; lithium; N heterocycles; organic batteries; polymerization

资金

  1. National Natural Science Foundation of China [21603167, 21975189]
  2. Recruitment Program of Global Youth Experts
  3. Fundamental Research Funds for the Central Universities [2042017kf0028]
  4. Wuhan University

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The study demonstrates that PPTZ as a cathode material exhibits superior electrochemical performance in dual-ion batteries, with high reversible capacity and cycling stability, attributed to its efficient synthesis and single-electron reversible redox mechanism.
p-Type electroactive polymers are promising cathodes for dual-ion batteries but cost-effective candidates are still lacking. In this study, the p-type polymer polyphenothiazine (PPTZ) is synthesized by a facile one-step oxidation polymerization from the low-cost phenothiazine (PTZ) monomer. As a cathode for rechargeable lithium batteries, PPTZ shows superior electrochemical performance to previously reported PTZ-based polymers with complicated structures and syntheses. For example, PPTZ has a high reversible capacity of 157 mAh g(-1) within 2.5-4.3 V vs. Li+/Li with an average discharge voltage of 3.5 V, and a high capacity retention of 77 % after 500 cycles. The highly reversible one-electron redox mechanism of PPTZ is also investigated in detail by electrochemical testing, ex situ FT-IR and X-ray photoelectron spectroscopy, and DFT calculations. PPTZ has the potential to serve as an attractive p-type cathode material for practical applications and the facile synthesis may be also extended to other polymer cathodes based on N-heteroaromatic units.

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