期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 23, 页码 5892-5896出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201400032
关键词
batteries; electrochemistry; electrode materials; rocking-chair cell; sodium
资金
- Programs of National 973 [2011CB935900]
- NSFC [21231005, 51231003]
- MOE [B12015, 113016A]
Developing organic compounds with multifunctional groups to be used as electrode materials for rechargeable sodium-ion batteries is very important. The organic tetrasodium salt of 2,5-dihydroxyterephthalic acid (Na(4)DHTPA; Na4C8H2O6), which was prepared through a green one-pot method, was investigated at potential windows of 1.6-2.8 V as the positive electrode or 0.1-1.8 Vas the negative electrode (vs. Na+/Na), each delivering compatible and stable capacities of ca. 180 mAhg(-1) with excellent cycling. A combination of electrochemical, spectroscopic and computational studies revealed that reversible uptake/removal of two Na+ ions is associated with the enolate groups at 1.6-2.8 V (Na2C8H2O6/Na4C8H2O6) and the carboxylate groups at 0.1-1.8 V (Na4C8H2O6/Na6C8H2O6). The use of Na4C8H2O6 as the initial active materials for both electrodes provided the first example of all-organic rocking-chair SIBs with an average operation voltage of 1.8 V and a practical energy density of about 65 Whkg(-1).
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