期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201701021
关键词
Li-ion supercapacitors; ion mobility; cathode materials; Na-ion batteries; polyoxometalates
类别
资金
- National 973 Program [2015CB251102]
- NSFC [U1305246, 21673196, 21621091, 21533006]
- Fundamental Research Funds for the Central Universities [20720150042]
- EPSRC [EP/H024/1, EP/I033459/1, EP/J00135X/1, EP/J015156/1, EP/K021966/1, EP/K023004/1, EP/K038885/1, EP/L015668/1, EP/L023652/1]
- ERC [670467 SMART-POM]
- Royal-Society Wolfson Foundation
- EPSRC [EP/R020914/1, EP/C542819/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J00135X/1, EP/I033459/1, EP/J015156/1, EP/K038885/1, EP/C542819/1, EP/K023004/1, EP/R020914/1, EP/L015668/1, EP/K021966/1, EP/L023652/1] Funding Source: researchfish
The polyanion Li7V15O36(CO3) is a nanosized molecular cluster (approximate to 1 nm in size), that has the potential to form an open host framework with a higher surface-to-bulk ratio than conventional transition metal oxide electrode materials. Herein, practical rechargeable Na-ion batteries and symmetric Li-ion batteries are demonstrated based on the polyoxovanadate Li7V15O36(CO3). The vanadium centers in {V15O36(CO3)} do not all have the same V-IV/V redox potentials, which permits symmetric devices to be created from this material that exhibit battery-like energy density and supercapacitor-like power density. An ultrahigh specific power of 51.5 kW kg(-1) at 100 A g(-1) and a specific energy of 125 W h kg(-1) can be achieved, along with a long cycling life (>500 cycles). Moreover, electrochemical and theoretical studies reveal that {V15O36(CO3)} also allows the transport of large cations, like Na+, and that it can serve as the cathode material for rechargeable Na-ion batteries with a high specific capacity of 240 mA h g(-1) and a specific energy of 390 W h kg(-1) for the full Na-ion battery. Finally, the polyoxometalate material from these electrochemical energy storage devices can be easily extracted from spent electrodes by simple treatment with water, providing a potential route to recycling of the redox active material.
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