期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 34, 页码 17790-17799出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta06206e
关键词
-
资金
- National Research Foundation of Korea (NRF) - South Korean Ministry of Science and ICT [NRF-2018R1D1A1B07050671, NRF-2018R1D1A3B07047285]
- Industrial Core Technology Development Program - South Korean Ministry of Trade, Industry Energy [20005342, 10062269]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10062269, 20005342] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The bandgap-dependent performance of covalent organic nanosheets (CONs) as sodium-ion battery anode materials was probed by inclusion of electron-deficient benzothiadiazole (BT) units into their network. Conjugation of BT units with electron-rich moieties afforded low-bandgap materials, and a self-assembled CON morphology with a large number of insertion sites for Na(+)ions was realizedviasolvothermal Stille cross-coupling. The bandgap dependence of Na(+)storage capacity was probed by the synthesis and characterization of large-bandgap CONs, which were subsequently compared to low-bandgap CONs in terms of electrochemical behavior. Four different CONs were investigated in total to reveal that the Na(+)storage capacity can be improved by increasing the charge carrier conductivityviathe inclusion of BT units, while the surface area can be controlled by maintaining the material backbone. The electrode with a solvothermally prepared low-bandgap CON demonstrated stable rate capability and cycling performance while exhibiting highly enhanced reversible discharge capacity (similar to 450 mA h g(-1)) after 30 cycles at a scan rate of 100 mA g(-1). To the best of our knowledge, this discharge capacity is among the best values reported so far for organic electrodes prepared without thermal treatment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据