期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 40, 页码 12528-12532出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201607194
关键词
batteries; electrodes; molecular engineering; renewable materials; sustainable chemistry
资金
- National NSFC [21231005, 51231003]
- MOE [B12015, IRT13R30]
Oxocarbon salts (M-2(CO)(n)) prepared through one-pot proton exchange reactions with different metal ions (M=Li, Na, K) and frameworks (n=4, 5, 6) have been rationally designed and used as electrodes in rechargeable Li, Na, and K-ion batteries. The results show that M-2(CO)(5)/M-2(CO)(6) salts can insert two or four metal ions reversibly, while M-2(CO)(4) shows less electrochemical activity. Especially, we discover that the K2C6O6 electrode enables ultrafast potassium-ion insertion/extraction with 212 mA h g(-1) at 0.2 C and 164 mA h g(-1) at 10 C. This behavior can be ascribed to the natural semiconductor property of K2C6O6 with a narrow band gap close to 0.9 eV, the high ionic conductivity of the K-ion electrolyte, and the facilitated K-ion diffusion process. Moreover, a first example of a K-ion battery with a rocking-chair reaction mechanism of K2C6O6 as cathode and K4C6O6 as anode is introduced, displaying an operation voltage of 1.1 Vand an energy density of 35 Wh kg(-1). This work provides an interesting strategy for constructing rapid K-ion batteries with renewable and abundant potassium materials.
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