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Surface Modification of Spinel LiMn2O4 with Y2O3 for Lithium-Ion Battery

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Abstract:

Spinel LiMn2O4 was modified with Y2O3 coating by a chemical process. The crystal structures of the as-prepared samples were investigated by X-ray diffraction (XRD). The charge/discharge characteristics of the modified samples were evaluated at different rates between 3.0 and 4.4V. The discharge capacities of 2.0 wt.% Y2O3-coated LiMn2O4 are 116 mAh•g−1, 99.7mAh•g−1, 93.3mAh•g−1 and 82.9mAh•g−1 at 0.1C, 0.5C, 1C and 2C rates (at 20◦C). The cycle abilities improvement of the spinel LiMn2O4 coated with Y2O3 are demonstrated at elevated temperature (55◦C) and high rates (2C). From the analysis of electrochemical impedance spectroscopy (EIS), the improvement of cycle ability may be attributed to the suppression on the formation of the passivating films and the reduction of Mn dissolution, which result from the surface modification with Y2O3.

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Info:

Periodical:

Advanced Materials Research (Volumes 391-392)

Pages:

1069-1074

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.391-392.1069

Citation:

Cite this paper

Online since:

December 2011

Authors:

Ying Bai, Feng Wu, Hua Tong Yang, Yu Zhong, Chuan Wu

Keywords:

Coating, Lithium-Ion Battery, Spinel LiMn2O4, Surface Modification, Y2O3

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