Shen Xiangyan, He Jianjiang, Wang Kun, Li Xiaodong, Wang Xin, Yang Ze, Wang Ning, Zhang Yanliang, Huang Changshui
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, 266101, Qingdao, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China.
ChemSusChem. 2019 Apr 5;12(7):1342-1348. doi: 10.1002/cssc.201900101. Epub 2019 Mar 5.
Lithium-ion capacitors (LICs) have shown extraordinary promise for electrochemical energy storage but are usually limited to electrodes with low energy density or power density owing to the lack of active storage sites and ion diffusion limitation. In this study, fluorine-enriched graphdiyne (F-GDY) is prepared by a solvothermal reaction. Owing to the 42-C hexagonal porous structure, abundant sp and sp hybrid carbon atoms, and even distribution of fluorine, F-GDY has enormous potential as an anode for lithium-ion storage. The outstanding rate performance (1825.9 mAh g at 0.1 A g , 979.2 mAh g at 5 A g ) and stable cycling stability of F-GDY in the lithium-ion battery inspire the assembly of a LIC with F-GDY as an anode and activated carbon (AC) as a cathode. When the AC/F-GDY mass ratio is 7:1, the LIC gives the largest energy density of 200.2 Wh kg , corresponding to a power density of 131.17 W kg . This LIC also shows excellent long-term cycling stability with a retention of approximately 80 % after 5000 cycles at 2 A g and a retention of more than 80 % after 6000 cycles at 5 A g .
锂离子电容器（LIC）在电化学储能方面展现出了非凡的前景，但由于缺乏活性存储位点和离子扩散限制，通常局限于能量密度或功率密度较低的电极。在本研究中，通过溶剂热反应制备了富氟石墨炔（F-GDY）。由于其六方42-C多孔结构、丰富的sp和sp杂化碳原子以及氟的均匀分布，F-GDY作为锂离子存储的负极具有巨大潜力。F-GDY在锂离子电池中出色的倍率性能（0.1 A g时为1825.9 mAh g，5 A g时为979.2 mAh g）和稳定的循环稳定性促使人们组装以F-GDY为负极、活性炭（AC）为正极的LIC。当AC/F-GDY质量比为7:1时，该LIC的最大能量密度为200.2 Wh kg，对应功率密度为131.17 W kg。该LIC还表现出优异的长期循环稳定性，在2 A g下5000次循环后保持率约为80%，在5 A g下6000次循环后保持率超过80%。
