title: High-performance spinel-rich Li1.5MnTiO4+δultralong 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+δbulk particles showed excellent cycle stability but poor rate performance. To address this drawback, ultralong nanofibers of a Li1.5MnTiO4+δspinel-layered heterostructure were synthesized by electrospinning. Uniform nanofibers with diameters of about 80 nm were formed of tiny octahedral particles wrapped together into 30 μm long fibers. The Li1.5MnTiO4+δnanofibers exhibited an improved rate capability compared to both Li1.5MnTiO4+δnanoparticles and bulk particles. The uniform one-dimensional nanostructure of the composite cathode exhibited enhanced capacities of 235 and 170 mAh g-1at 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).
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Ngoc
authors.initials: N
authors.lastname: Hung Vu
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Paulraj
authors.initials: P
authors.lastname: Arunkumar
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
authors.forename: Won
authors.initials: W
authors.lastname: Bin Im