Influence of Ni/Cr Substitution for Mn on Crystal Structure and Electrochemical Performance of LiMn₂O₄ Cathode Materials

Abstract:

LiMn₂O₄ and LiNi_0.5-xCr_2xMn_1.5-xO₄(x=0, 0.05) cathode materials of spinel structure were prepared via co-precipitation derived precursors and subsequent high-temperature sintering between the precursors and LiOH. XRD, SEM and electrochemical tests were performed for the characterization of the as-prepared samples. The results show that the substitutions of Ni and Cr for Mn can not prevent Mn²⁺from being oxidized into Mn³⁺ in solution process, yet do not change their final crystal structures of spinel with or without substitution, and after substitution the first charge and discharge capacities decrease but its cyclic capability is improved significantly, especially for the Ni and Cr co-substitution

• Periodical: Advanced Materials Research (Volumes 912-914)
• Pages: 204-209
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.912-914.204
• Online since: April 2014
• Authors: Fei Luo, Lin Zhang, Jian Hua Wang, Yu Zhong Guo*
• Keywords: Co-Precipitation, Cyclic Capability, LiMn₂O₄, Ni/Cr Substitution, Precursor Oxidation

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