3.0 V High Energy Density Symmetric Sodium-Ion Battery: Na4 V2 (PO4 )3 ∥Na3 V2 (PO4 )3

ACS Applied Materials & Interfaces
Xuhui YaoLiqiang Mai

Abstract

Symmetric sodium-ion batteries (SIBs) are considered as promising candidates for large-scale energy storage owing to the simplified manufacture and wide abundance of sodium resources. However, most symmetric SIBs suffer from suppressed energy density. Here, a superior congeneric Na4V2(PO4)3 anode is synthesized via electrochemical preintercalation, and a high energy density symmetric SIB (Na3V2(PO4)3 as a cathode and Na4V2(PO4)3 as an anode) based on the deepened redox couple of V4+/V2+ is built for the first time. When measured in half cell, both electrodes show stabilized electrochemical performance (over 3000 cycles). The symmetric SIBs exhibit an output voltage of 3.0 V and a cell-level energy density of 138 W h kg-1. Furthermore, the sodium storage mechanism under the expanded measurement range of 0.01-3.9 V is disclosed through an in situ X-ray diffraction technique.

References

May 4, 2005·Nature Materials·Antonino Salvatore AricòWalter van Schalkwijk
Oct 31, 2009·Scientific American·Mark Z Jacobson, Mark A Delucchi
Jul 22, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Steffen HartungMadhavi Srinivasan
Mar 13, 2015·Chemical Communications : Chem Comm·Zelang JianXiulei Ji
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Dec 17, 2016·Advanced Science·Lei ZhangXianluo Hu
Feb 22, 2017·Advanced Materials·Zelang JianWen Chen
Jun 24, 2017·Nature·Liqiang MaiYunlong Zhao

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