Details

Autor(en) / Beteiligte

• Chen, Jia‐Jia
• Ye, Jian‐Chuan
• Zhang, Xia‐Guang
• Symes, Mark D.
• Fan, Shao‐Cong
• Long, De‐Liang
• Zheng, Ming‐Sen
• Wu, De‐Yin
• Cronin, Leroy
• Dong, Quan‐Feng

Titel

Design and Performance of Rechargeable Sodium Ion Batteries, and Symmetrical Li‐Ion Batteries with Supercapacitor‐Like Power Density Based upon Polyoxovanadates

Ist Teil von

• Advanced energy materials, 2018-02, Vol.8 (6), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The polyanion Li7V15O36(CO3) is a nanosized molecular cluster (≈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 VIV/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. A Li7V15O36(CO3)‐cluster‐based Li‐ion device exhibits battery‐like energy density of 125 W h kg−1 and supercapacitor‐like power density of 51.5 kW kg−1 at 100 A g−1, along with a long cycling life (>500 cycles). Moreover, it also permits fast diffusion of large cations, like Na+, and shows a high energy density (390 W h kg−1) as the cathode in full Na‐ion batteries.