Preparation and Electrochemical Performance of Mg^{2 +} Doped Li₄Ti₅O₁₂ Anode Materials for Lithium-Ion Batteries

Abstract:

Spinel Li₄Ti₅O₁₂ (LTO) doped with Mg²⁺ was synthesized by solid-phase reaction method. The Mg²⁺ doping quantity was 3%, 6%, 9%, and 12%, respectively. The structure and electrochemical performance of the prepared LTO composites were investigated by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Electrochemical Impedance Spectroscopy (EIS), and galvanostatic charge-discharge tests. It was found that the doped Mg ion did not change the structure of Li₄Ti₅O₁₂, and it was evenly distributed around Li₄Ti₅O₁₂. When Mg²⁺ doping quantity increased from 3% to 12%, the internal resistance and charge transfer resistance of the composite both decreased. The first discharge specific capacity of 6%-Mg²⁺ doped LTO composite was 168 mAh/g, which was close to the theoretical capacity of pure lithium titanate (175 mAh/g), and the capacity retention rate was 98% after 100 cycles.

• Periodical: Materials Science Forum (Volume 960)
• Pages: 238-243
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.960.238
• Online since: June 2019
• Authors: Ming Wang, Xue Ming Zhang, Ying Bo Wang, Li Li Cheng, Xue Lei Wang, Qiang Zhang*
• Keywords: Anode Materials, Electrochemical Performance, Mg²⁺ Doping Modification, Solid-Phase Reaction

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