Intercalating Ti2Nb14O39 Anode Materials for Fast‐Charging, High‐Capacity and Safe Lithium–Ion Batteries. Issue 46 (17th October 2017)

• Record Type: Journal Article
• Authors: Lin, Chunfu; Deng, Shengjue; Kautz, David J.; Xu, Zhihao; Liu, Tao; Li, Jianbao; Wang, Ning; Lin, Feng
• Is Part Of: Small. Volume 13:Issue 46(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-10-17
• Subjects: anode -- electrochemical performance -- Li+‐ion diffusion coefficient -- lithium‐ion battery -- Ti2Nb14O39 porous sphere; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201702903
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: 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, Ti2 Nb14 O39, as an advanced anode material. Ti2 Nb14 O39 porous spheres (Ti2 Nb14 O39 ‐S) exhibit a defective shear ReO3 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 Ti2 Nb14 O39 ‐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 Ti2 Nb14 O39 ‐S can be a promising anode material for fast‐charging, high capacity, safe and stable lithium‐ion batteries. Abstract : Intercalating Ti2 Nb14 O39 is explored as a new anode material for fast‐charging, high‐capacity, safe, and stable lithium–ion batteries. Ti2 Nb14 O39 porous spheres with a defective crystal structure exhibit comprehensively good properties (including high ionic conductivity, significant pseudocapacitive behavior, high reversible specific capacity, safe working potential, high first‐cycle coulombic efficiency, outstanding rate capability, and excellent cycling stability), outperforming other Ti–Nb–O materials.