Boosting the performance of organic cathodes through structure tuning

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jian Xie
  • Wangqiao Chen
  • Guankui Long
  • Weibo Gao
  • Zhichuan J. Xu
  • Ming Liu

Detail(s)

Original languageEnglish
Pages (from-to)12985-12991
Journal / PublicationJournal of Materials Chemistry A
Volume6
Issue number27
Online published22 Jun 2018
Publication statusPublished - 21 Jul 2018
Externally publishedYes

Abstract

The decisive factor to realize high-capacity rechargeable batteries is the cathode. Since the experimental capacity of inorganic cathodes is usually less than 200 mA h g-1, searching for new cathode materials to boost the capacity is highly desirable. Here, we design and synthesize two novel organic cathodes, poly(pyrene-4,5,9,10-tetraone) (PPTO) and poly(2,7-ethynylpyrene-4,5,9,10-tetraone) (PEPTO), based on the highly redox-active pyrene-4,5,9,10-tetraone. Due to their four Li+ ion intake characteristics, both cathodes show a large reversible capacity of 234 & 244 mA h g-1 and a high energy density of up to 530 & 507 W h kg-1, respectively. In particular, benefiting from the enhanced conjugation and planarity, PEPTO with the addition of a carbon-carbon triple bond (CC) delivers a significantly improved rate stability at high current densities and an excellent capacity retention of 110 mA h g-1 after 1000 cycles (at 800 mA g-1). Our approach could provide an effective strategy to prepare new organic cathodes for the next generation of high stability and high energy density organic batteries through structure tuning.

Citation Format(s)

Boosting the performance of organic cathodes through structure tuning. / Xie, Jian; Chen, Wangqiao; Long, Guankui; Gao, Weibo; Xu, Zhichuan J.; Liu, Ming; Zhang, Qichun.

In: Journal of Materials Chemistry A, Vol. 6, No. 27, 21.07.2018, p. 12985-12991.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review