期刊
NANO LETTERS
卷 18, 期 4, 页码 2402-2410出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b05403
关键词
Layer-structured metal oxide; aqueous Zn-ion batteries; high capacity; prolonged cycle lifespan; high energy
类别
资金
- Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013M3A6B1078875]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2017R1A2A1A17069397]
Owing to their safety and low cost, aqueous rechargeable Zn-ion batteries (ARZIBs) are currently more feasible for grid-scale applications, as compared to their alkali counterparts such as lithium- and sodium-ion batteries (LIBs and SIBs), for both aqueous and nonaqueous systems. However, the materials used in ARZIBs have a poor rate capability and inadequate cycle lifespan, serving as a major handicap for long-term storage applications. Here, we report vanadium-based Na2V6O16 center dot 3H(2)O nanorods employed as a positive electrode for ARZIBs, which display superior electrochemical Zn storage properties. A reversible Zn2+-ion (de)intercalation reaction describing the storage mechanism is revealed using the in situ synchrotron X-ray diffraction technique. This cathode material delivers a very high rate capability and high capacity retention of more than 80% over 1000 cycles, at a current rate of 40C (IC = 361 mA g(-1)). The battery offers a specific energy of 90 W h kg(-1) at a specific power of 15.8 KW kg(-1), enlightening the material advantages for an eco-friendly atmosphere.
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