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Ultrathin Ti 2 Nb 2 O 9 Nanosheets with Pseudocapacitive Properties as Superior Anode for Sodium‐Ion Batteries
Author(s) -
Shen Laifa,
Wang Yi,
Lv Haifeng,
Chen Shuangqiang,
Aken Peter A.,
Wu Xiaojun,
Maier Joachim,
Yu Yan
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201804378
Subject(s) - materials science , anode , sodium , sodium ion battery , chemical engineering , ion , energy storage , exfoliation joint , diffusion , nanotechnology , electrode , metallurgy , faraday efficiency , power (physics) , chemistry , physics , graphene , quantum mechanics , thermodynamics , engineering
Sodium‐ion batteries are emerging as promising candidates for grid energy storage because of the abundant sodium resources and low cost. However, the identification and development of suitable anode materials is far from being satisfactory. Here, it is demonstrated that the Ti 2 Nb 2 O 9 nanosheets with tunnel structure can be used as suitable anode materials for sodium‐ion batteries. Ti 2 Nb 2 O 9 nanosheets are synthesized by liquid exfoliation combined with topotactic dehydration, delivering a high reversible capacity of 250 mAh g −1 at 50 mA g −1 at a suitable average voltage of ≈0.7 V. It is found that a low energy diffusion barrier, enlarged interlayer spacing, and exceptional nanoporosity together give rise to high rate performance characterized by pseudocapacitive behavior. The observed high reversible capacity, excellent rate capability, and good cyclability of Ti 2 Nb 2 O 9 nanosheets make this material competitive when compared to other sodium insertion anode materials.