期刊
CHEMSUSCHEM
卷 14, 期 20, 页码 4601-4608出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202101623
关键词
electrode materials; energy storage; lithium-ion batteries; lithium storage; porous framework polymer
资金
- Shanghai Domestic Science and Technology Cooperation Project [21015801000]
- Project of Ningxia Key RD Plan [2021BEE03006]
The novel salen-based porous framework polymer (SPP) showed high specific capacity and good cycling stability in rechargeable lithium-ion batteries, mainly due to its unique structure and stable skeleton.
Organic electrode materials with abundant resources, environmental friendliness and recyclability play a crucial role in rechargeable lithium-ion batteries (LIBs). However, the inferior electrical conductivity and unsatisfactory long-term cycling performance seriously impede their large-scale application in LIBs. Herein, a novel salen-based porous framework polymer (SPP) with a large conjugated skeleton was constructed and utilized as anode for LIBs. Owing to its unique architecture with a large conjugated skeleton facilitating the electron transport, rich pores accelerating the organic electrolyte infiltration, and stable skeleton structure improving the long-term cycling performance, SPP delivered a high specific capacity of 337 mA h g(-1) at 0.1 C (1 C=250 mA g(-1)) after 100 cycles, and robust rate capacity of 95.5 mA h g(-1) at 32 C. Importantly, an impressive long-term cycling performance with a storage capacity of 155.7 mA h g(-1) at 8 C after 4000 cycles was obtained, showing a durable cyclic stability of SPP. Furthermore, the lithium storage mechanism of SPP was evaluated by ex-situ X-ray photoelectron spectroscopy, manifesting that the multiple active sites of C=N, -OH, and benzene ring were responsible for the superior lithium storage performance. The novel SPP presented in this work should be a promising organic electrode for energy storage applications.
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