Boosting the performance of organic cathodes through structure tuning

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 organ...

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Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (27), p.12985-12991
Hauptverfasser: Xie, Jian, Chen, Wangqiao, Long, Guankui, Gao, Weibo, Xu, Zhichuan J., Liu, Ming, Zhang, Qichun
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container_end_page 12991
container_issue 27
container_start_page 12985
container_title Journal of materials chemistry. A, Materials for energy and sustainability
container_volume 6
creator Xie, Jian
Chen, Wangqiao
Long, Guankui
Gao, Weibo
Xu, Zhichuan J.
Liu, Ming
Zhang, Qichun
description 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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.
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source Royal Society Of Chemistry Journals 2008-
subjects Batteries
Carbon
Cathodes
Conjugation
Electrode materials
Energy
Flux density
Lithium
Lithium ions
Pyrene
Rechargeable batteries
Tuning
title Boosting the performance of organic cathodes through structure tuning
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