期刊
ENERGY STORAGE MATERIALS
卷 50, 期 -, 页码 225-233出版社
ELSEVIER
DOI: 10.1016/j.ensm.2022.05.021
关键词
Covalent organic polymer; pi-conjugated; Lithium-ion battery; Anode; Lithium storage mechanism
资金
- National Natural Science Foundation of China [22169016, 51764048]
- Program of innovative research team (in sci-ence and technology) in University of Yunnan Province [2018FH001-007]
- Joint Key Pro-jects of Universities in Yunnan Province [202101AT070048]
- Fundamental Research Project of Yunnan Province
The feasibility of various characteristics of a two-dimensional covalent organic polymer offers exclusive alternative electrode materials for lithium storage. In this work, a nitrogen-rich two-dimensional covalent quinazoline polymer was designed and developed, showing excellent electrochemical performance as an anode for lithium-ion batteries.
The feasibility of assorted characteristics of fast charge-transport, abundance active sites, and controlled molecular designing of the pi-conjugated porous two-dimensional covalent organic polymer offers exclusive alternative electrode materials for lithium storage. However, the functioning of an organic polymer electrode in terms of specific capacity, cycle life, and rate performance is still lacking. In this work, we report the theoretical design and corresponding practical development of a nitrogen-rich two-dimensional pi-conjugated porous covalent quinazoline polymer (HAT-CQP). The results show that HAT-CQP as anode for lithium-ion batteries can produce an excellent electrochemical performance. The discharge-specific capacity reaches 478 mAh g(+1) even after 510 cycles, and a 82.3% of capacity retention rate is acquired at 800 mAg(-1). The X-ray photoelectron spectroscopy results along with theoretical calculations reveal that the designed structure of HAT-CQP can store 7 Li+ located on a pyrazine-like C=N and conjugated heterocycles.
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