Electrochemical behavior of interconnected Ti2Nb10O29 nanoparticles for high-power Li-ion battery anodes

[Display omitted] •Ti2Nb10O29 nanofibers and powders are fabricated by electrospinning and solid-state reaction process.•Linearly connected single crystal nanofibers are formed.•Rate capability and cycle stability of the nanofibers are enhanced compared to the powders.•Diffusion behaviors of Li ion...

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Bibliographic Details
Published in:Electrochimica acta 2017-05, Vol.236, p.451-459
Main Authors: Pham-Cong, De, Kim, Jinwoo, Tran, Van Tan, Kim, Su Jae, Jeong, Se-Young, Choi, Jun-Hee, Cho, Chae Ryong
Format: Article
Language:English
Subjects:
Anodes
Chemical synthesis
Crystal structure
Diffusion annealing
Diffusion coefficient
Electrochemical analysis
Electrode materials
Electron transport
Kinetics
Lithium-ion batteries
Nanofibers
Nanoparticles
Nanostructure
Rechargeable batteries
single crystal
Single crystals
Ti2Nb10O29
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Summary:[Display omitted] •Ti2Nb10O29 nanofibers and powders are fabricated by electrospinning and solid-state reaction process.•Linearly connected single crystal nanofibers are formed.•Rate capability and cycle stability of the nanofibers are enhanced compared to the powders.•Diffusion behaviors of Li ion through the Ti2Nb10O29 single crystallite are better than other samples. We synthesized polycrystalline Ti2Nb10O29 nanofibers (NFs) via a simple post-annealing process of as-electrospun polymeric NFs as an anode material for Li-ion batteries (LIBs). During the first discharge/charge process, the Ti2Nb10O29 NFs annealed at 900°C exhibited insertion/extraction capacities of up to 344 and 304mAhg−1, corresponding to 19.1 and 16.7mol Li+ per formula unit, respectively. This material exhibited excellent rate capability (93mAhg−1 at 15Ag−1) and a higher average diffusion coefficient (DLi=∼1.5×10−12cm2s−1) than Ti2Nb10O29 powder (∼6.9×10−13cm2s−1). This performance can be attributed to the unique nanostructure of firmly interconnected, highly crystalline Ti2Nb10O29 nano-grains, which facilitates the Li+ and electron transport. The kinetics obtained from current-voltage curves indicate a mixture of diffusion-limited and capacitive processes. The suggested electro-spinning/post annealing approach can effectively provide a simple route towards high-quality Ti2Nb10O29 NF-based anodes for high-performance LIBs.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.03.203