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High-performance spinel-rich Li1.5MnTiO4+? ultralong nanofibers as cathode materials for Li-ion batteries.

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+? bulk particles showed excellent cycle stability but poor rate performance. To address this drawback, ultralong nanofibers of a Li1.5MnTiO4+? 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??m long fibers. The Li1.5MnTiO4+? nanofibers exhibited an improved rate capability compared to both Li1.5MnTiO4+? 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).

SUBMITTER: Hung Vu N 

PROVIDER: S-EPMC5374536 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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High-performance spinel-rich Li<sub>1.5</sub>MnTiO<sub>4+δ</sub> ultralong nanofibers as cathode materials for Li-ion batteries.

Hung Vu Ngoc N   Arunkumar Paulraj P   Bin Im Won W  

Scientific reports 20170331

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 Li<sub>1.5</sub>MnTiO<sub>4+δ</sub> bulk particles showed excellent cycle stability but poor rate performance. To address this drawback, ultralong nanofibers of a Li<sub>1.5</sub>MnTiO<sub>4+δ</sub> spinel-layered heterostructure were synthesized by electrospinning. Uniform nanofibers with diameters of about 80 nm were formed of t  ...[more]

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