期刊
ENERGY STORAGE MATERIALS
卷 29, 期 -, 页码 9-16出版社
ELSEVIER
DOI: 10.1016/j.ensm.2020.03.024
关键词
Zinc ion batteries; K+ incorporation; Hydrated vanadate; High capacity; Structural engineering
资金
- National Science Foundation [CBET-1803256, NNCI-1542101]
- National Science Foundation of China [21576090]
- Fundamental Research Funds for the Central Universities [222201718002]
- University of Washington
- Molecular Engineering & Sciences Institute
- Clean Energy Institute
- CSC
- National Institute of Standards and Technology (NIST)
- International Scientific Partnership Program (ISPP) at King Saud University [ISPP-139]
Vanadium oxides are promising candidates for cathode materials in aqueous zinc-ion batteries (ZIBs) with low cost and high capacity yet requirements for long cycling necessitate the development of increasingly stable structure. This study reports a structural engineering method by incorporating K+ into hydrated vanadium pentoxide (V2O5 center dot nH(2)O, VOH) to achieve unique hydrated vanadate (KV12O30-y center dot nH(2)O, KVOH). In contrast to previously reported works, K+ introduction leads to a new phase of KVOH with faster ion diffusion kinetics and better long-term cycling stability. This work establishes an understanding of the role of K+ incorporation in KVOH which goes beyond its conventional categorization as an agent for interlayer spacing adjustment, reflecting in maintaining structure flexibility for effective Zn2+ insertion/extraction even at high rates, improving materials conductivity by the electron hoping of V4+/V5+ and acting as a stabilizer to accommodate structural contraction/ expansion with smaller voltage hysteresis and higher reversibility. KVOH displays a remarkable capacity of 436 mAh g(-1) at 0.05 A g(-1), maintains 227 mAh g(-1) at 10 A g(-1), which is better than VOH and the majority of reported monovalent and multivalent metal ions introduced in vanadates. KVOH exhibits excellent cycling stability with 92% capacity retention over 3000 cycles at 5 A g(-1), high energy density (308 Wh kg(-1)) and power density (7502 W kg(-1)), as well as improved energy efficiency. These characteristics recommend KVOH cathodes for use in high-performance aqueous ZIBs.
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