Spinel-layered Li2MnTiO4+z nanofibers as cathode materials for Li-ion batteries

• Published in: Solid state sciences 2020-05, Vol.103, Article 106178
• Main Authors: Vu, Ngoc Hung, Dao, Van-Duong, Van, Hoang Nhu, Huy, Le Thanh, Quang, Nguyen Trong, Huu, Ha Tran, Choi, Sungho, Im, Won Bin
• Format: Article
• Language: English
• Subjects: Electrospinning; Li-ion battery; LiMnTiO4; Nanofibers; Spinel framework
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2020.106178

In this study, we propose composite materials based on the Li–Mn–Ti–O system to develop low cost and environmentally benign cathode materials for Li-ion batteries. Specifically, spinel-layered Li2MnTiO4+z (0.5LiMnTiO4•0.5Li2Mn0·5Ti0·5O3) material is studied with the aim to increase the operating voltage of the cathode. In contrast, to increase the capacity as well as rate capability of the cathode, an electrospinning technique is employed to synthesize uniform nanofibers with diameters of approximately 80 nm and a length of 15 μm. The hetero- and one-dimensional structure of the prepared sample facilitate Li+ transport by shortening the diffusion length for the ions. Consequently, high capacities of 210 (average operating voltage ~3.1 V) and 150 mAh g−1 at C/10 and 1C rates, respectively, are obtained. [Display omitted] •Introduction of ultralong spinel-layered Li2MnTiO4+z nanofibers with diameters of about 80 nm and length of 15 µm.•Elucidating relationship between structure and electrochemical properties of the nanofibers.•A high reversible capacity of 210 mAh g-1 at C/10 and 95.3 % capacity retention after 100 cycles at 1C are obtained.