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Design and Performance of Rechargeable Sodium Ion Batteries, and Symmetrical Li‐Ion Batteries with Supercapacitor‐Like Power Density Based upon Polyoxovanadates
Author(s) -
Chen JiaJia,
Ye JianChuan,
Zhang XiaGuang,
Symes Mark D.,
Fan ShaoCong,
Long DeLiang,
Zheng MingSen,
Wu DeYin,
Cronin Leroy,
Dong QuanFeng
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201701021
Subject(s) - materials science , supercapacitor , electrochemistry , power density , battery (electricity) , energy storage , vanadium , cathode , vanadium oxide , nanoarchitectures for lithium ion batteries , ion , electrode , organic radical battery , specific energy , redox , electrochemical energy conversion , nanotechnology , oxide , transition metal , chemical engineering , power (physics) , catalysis , chemistry , thermodynamics , organic chemistry , physics , engineering , metallurgy
The polyanion Li 7 V 15 O 36 (CO 3 ) 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 Li 7 V 15 O 36 (CO 3 ). The vanadium centers in {V 15 O 36 (CO 3 )} 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 {V 15 O 36 (CO 3 )} 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.