Electrochemical Characteristics of the Magnesium Titanium Composite Oxide-Coated Spinel-Type Lithium Manganese Oxide

Abstract:

In this experiment, the spinel-type lithium manganese oxide (LiMn₂O₄) prepared via solid-phase sintering method was coated with magnesium titanium composite oxide (MgTiO_x) in the presence of polyvinyl pyrrolidone (PVP) under the ultrasonic wave. The crystal structures, surface morphologies and electrochemical properties of the sample prepared were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical analysis. The X-ray diffractions indicated that the LiMn₂O₄ coated with MgTiO_x were similar to that of the pure LiMn₂O_4, and they both showed sharp and high peaks. The particles of the samples prepared with PVP did not aggregate obviously, and the samples were coated completely and homogeneously. At charge-discharge rates of 0.2C, the first discharge capacity can reach more than 120 mAh / g. Compared with pure LiMn₂O₄, the capacity attenuation of MgTiO_x-coated LiMn₂O₄ reduced after fifty cycles, and showed good electrochemical performance.

• Periodical: Key Engineering Materials (Volume 591)
• Pages: 236-239
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.591.236
• Online since: November 2013
• Authors: Hai Quan Wang, Zhi Qiang Hu, Kun Yang, Yang Yu, Jing Xiao Liu, Hong Shun Hao, Hua Liu
• Keywords: LiMn₂O₄, Lithium-Ion Battery, PVP-Assisted, Surface Coating

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