Lithium-Excess Research of Cathode Material Li2MnTiO4 for Lithium-Ion Batteries

Nanomaterials

Xinyi Zhang¹  Le Yang¹  Feng Hao³  Haosen Chen⁴  Meng Yang²  Daining Fang¹ 

[1] College of Engineering, Peking University, Beijing 100087, China; E-Mails:;College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA; E-Mail:;Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China

关键词: lithium-ion batteries;    cathode;    titanate material;    nanoscale particle;    lithium excess;    phase transition;   

DOI  :  10.3390/nano5041985

来源: mdpi

【 摘 要 】

Lithium-excess and nano-sized Li_2+xMn_1−x/2TiO₄ (x = 0, 0.2, 0.4) cathode materials were synthesized via a sol-gel method. The X-ray diffraction (XRD) experiments indicate that the obtained main phases of Li_2.0MnTiO₄ and the lithium-excess materials are monoclinic and cubic, respectively. The scanning electron microscope (SEM) images show that the as-prepared particles are well distributed and the primary particles have an average size of about 20–30 nm. The further electrochemical tests reveal that the charge-discharge performance of the material improves remarkably with the lithium content increasing. Particularly, the first discharging capacity at the current of 30 mA g⁻¹ increases from 112.2 mAh g⁻¹ of Li_2.0MnTiO₄ to 187.5 mAh g⁻¹ of Li_2.4Mn_0.8TiO₄. In addition, the ex situ XRD experiments indicate that the monoclinic Li₂MnTiO₄ tends to transform to an amorphous state with the extraction of lithium ions, while the cubic Li₂MnTiO₄ phase shows better structural reversibility and stability.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.