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Title: Boosting the performance of organic cathodes through structure tuning
Authors: Xie, Jian
Chen, Wangqiao
Long, Guankui
Gao, Weibo
Xu, Jason Zhichuan
Liu, Ming
Zhang, Qichun
Keywords: Engineering::Materials
Issue Date: 2018
Source: Xie, J., Chen, W., Long, G., Gao, W., Xu, J. Z., Liu, M., & Zhang, Q. (2018). Boosting the performance of organic cathodes through structure tuning. Journal of Materials Chemistry A, 6(27), 12985-12991. doi:10.1039/c8ta03857k
Project: MOE 2017-T2-1-021
Open Project of State Key Laboratory of Supramolecular Structure and Materials (Grant number: sklssm201833), Jilin University, China.
Journal: Journal of Materials Chemistry A
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 (C[triple bond, length as m-dash]C) 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.
ISSN: 2050-7488
DOI: 10.1039/c8ta03857k
Rights: © 2018 The Royal Society of Chemistry. All rights reserved. This paper was published in Journal of Materials Chemistry A and is made available with permission of The Royal Society of Chemistry.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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