期刊
RSC ADVANCES
卷 10, 期 52, 页码 31049-31055出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra05483f
关键词
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资金
- Natural Science Foundation of China [21603016, 21704081, 21875180]
- Natural Science Foundation of Shaanxi province [2017JQ2023, 2018JM2026]
- Cyrus Chung Ying Tang Foundation\o gs4:
Organic carbonyl redox polymers, especially conjugated polyimides with multiple reversible redox centers have attracted considerable attention as electrode materials for organic Li-ion batteries. However, the low utilization of carbonyls hindered their potential applications in energy storage. Herein, a novel pi-conjugated polyimide (PBPI) based on biphenyl diimide (BPI) containing two seven-membered imide rings is developed.PBPIis used as an anode material for organic Li-ion batteries, which show high conductivity and insolubility in the electrolyte and enable intercalation of four Li-ions perBPIunit, thus contributing to a reversible capacity of 136 mA h g(-1)at 100 mA g(-1)with coulombic efficiency close to 100%. Moreover, the battery based onPBPImanifested superior high-rate performance (65 mA h g(-1)at 2000 mA g(-1)) as well as significant cycling stability (over 1600 cycles at 100 mA g(-1)). Remarkably, the full redox-active site (CO) utilization of an aromatic diimide core to achieve its full potential applications is reported for the first time. This work provides a new strategy for developing redox pi-conjugated polyimides and accommodation of more alkaline ions for high performance battery systems.
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