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Nanocrystal‐Assembled Porous Na 3 MgTi(PO 4 ) 3 Aggregates as Highly Stable Anode for Aqueous Sodium‐Ion Batteries
Author(s) -
Zhang Fang,
Li Wanfeng,
Xiang Xingde,
Sun Molong
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703044
Subject(s) - materials science , nanocrystal , anode , aqueous solution , electrochemistry , cyclic voltammetry , chemical engineering , mesoporous material , nanostructure , porosity , scanning electron microscope , nanotechnology , electrode , chemistry , composite material , organic chemistry , engineering , catalysis
Aqueous sodium‐ion batteries (SIBs) represent a class of green electrochemical technology for large‐scale storage of sustainable energies such as wind power and solar radiation, owing to their low cost, environmental friendliness, and reliable safety. However, there is still lack of available anode materials for aqueous SIBs. Herein, nanocrystal‐assembled porous Na 3 MgTi(PO 4 ) 3 aggregates are reported as novel anode material for aqueous SIBs. The crystal structure, morphological features, and electrochemical properties have been analyzed with X‐ray diffraction, scanning electron microscopy, transition electron microscopy, cyclic voltammetry, and charge/discharge measurements. As revealed, the material possesses a porous nanostructure composed of 5 nm nanocrystals and mesoporous channels. During Na‐insertion/extraction, it undergoes a one‐step single‐phase reaction mechanism through reversible electrochemistry of the Ti 4+ /Ti 3+ redox couple, showing a rechargeable capacity of 54 mAh g −1 and an average working potential of −0.63 V (vs. Ag/AgCl) at 0.2 C. More importantly, good rate capacity (33 mAh g −1 at 4 C) and excellent cycling performance (94.2 % capacity retention after 100 cycles at 0.5 C) are achieved due to the unique porous nanostructure and robust compositional framework. The finding in this work would create new opportunities for design of low‐cost, long‐cycling aqueous SIBs.