High-performance spinel-rich Li1.5MnTiO4+δ ultralong nanofibers as cathode materials for Li-ion batteriesopen access
- Authors
- Ngoc Hung Vu; Arunkumar, Paulraj; Im, Won Bin
- Issue Date
- Mar-2017
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.7
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 7
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/20486
- DOI
- 10.1038/srep45579
- ISSN
- 2045-2322
- Abstract
- Recently, composite materials based on Li-Mn-Ti-O system were developed to target low cost and environmentally benign cathodes for Li-ion batteries. The spinel-layered Li1.5MnTiO4+delta bulk particles showed excellent cycle stability but poor rate performance. To address this drawback, ultralong nanofibers of a Li1.5MnTiO4+delta spinel-layered heterostructure were synthesized by electrospinning. Uniform nanofibers with diameters of about 80 nm were formed of tiny octahedral particles wrapped together into 30 mu m long fibers. The Li1.5MnTiO4+delta nanofibers exhibited an improved rate capability compared to both Li1.5MnTiO4+delta nanoparticles and bulk particles. The uniform one-dimensional nanostructure of the composite cathode exhibited enhanced capacities of 235 and 170 mAh g(-1) at C/5 and 1 C rates, respectively. Its unique structure provided a large effective contact area for Li+ diffusion, and low charge transfer resistance. Moreover, the layered phase contributed to its capacity in over 3 V region, which increased specific energy (726 Wh kg(-1)) compared to the bulk particles (534 Wh kg(-1)).
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