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Intercalating Ti 2 Nb 14 O 39 Anode Materials for Fast‐Charging, High‐Capacity and Safe Lithium–Ion Batteries
Author(s) -
Lin Chunfu,
Deng Shengjue,
Kautz David J.,
Xu Zhihao,
Liu Tao,
Li Jianbao,
Wang Ning,
Lin Feng
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201702903
Subject(s) - anode , materials science , faraday efficiency , lithium (medication) , electrochemistry , chemical engineering , intercalation (chemistry) , ion , capacity loss , nanotechnology , inorganic chemistry , electrode , medicine , chemistry , engineering , endocrinology , physics , quantum mechanics
Ti–Nb–O binary oxide materials represent a family of promising intercalating anode materials for lithium‐ion batteries. In additional to their excellent capacities (388–402 mAh g –1 ), these materials show excellent safety characteristics, such as an operating potential above the lithium plating voltage and minimal volume change. Herein, this study reports a new member in the Ti–Nb–O family, Ti 2 Nb 14 O 39 , as an advanced anode material. Ti 2 Nb 14 O 39 porous spheres (Ti 2 Nb 14 O 39 ‐S) exhibit a defective shear ReO 3 crystal structure with a large unit cell volume and a large amount of cation vacancies (0.85% vs all cation sites). These morphological and structural characteristics allow for short electron/Li + ‐ion transport length and fast Li + ‐ion diffusivity. Consequently, the Ti 2 Nb 14 O 39 ‐S material delivers significant pseudocapacitive behavior and excellent electrochemical performances, including high reversible capacity (326 mAh g −1 at 0.1 C), high first‐cycle Coulombic efficiency (87.5%), safe working potential (1.67 V vs Li/Li + ), outstanding rate capability (223 mAh g –1 at 40 C) and durable cycling stability (only 0.032% capacity loss per cycle over 200 cycles at 10 C). These impressive results clearly demonstrate that Ti 2 Nb 14 O 39 ‐S can be a promising anode material for fast‐charging, high capacity, safe and stable lithium‐ion batteries.