Impacts of Cr Substitution on Ion Distributions and Electrochemical Performance of LiNi0.5-xCr2xMn1.5-xO4 Cathode Materials

Xiao Hong Shi; Fei Luo; Lin Zhang; Yu Zhong Guo

doi:10.4028/www.scientific.net/AMR.1058.307

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1058Impacts of Cr Substitution on Ion Distributions...

Impacts of Cr Substitution on Ion Distributions and Electrochemical Performance of LiNi_0.5-xCr_2xMn_1.5-xO₄ Cathode Materials

Abstract:

A spinel-structured LiNi_0.5-xCr₂_xMn₁_.5_-xO₄(x=0, 0.05) were prepared via co-precipitation routes. The experiment results from XRD, SEM and electrochemical analyses show that the substitutions of Ni and Cr for Mn in LiMn₂O₄can not prevent Mn²⁺from being oxidized into Mn³⁺ in solution process, however,Mn²⁺ oxidation does not change their final crystal structures of spinel phase, but do influence the Li/Ni²⁺ cation mixing and Mn³⁺occurrence in lattice. After substitution the first charge and discharge capacities decrease but its cycleability is improved significantly, especially for the Ni and Cr co-substitution

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Advanced Materials Research (Volume 1058)

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307-311

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1058.307

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Online since:

November 2014

Authors:

Xiao Hong Shi, Fei Luo, Lin Zhang, Yu Zhong Guo*

Keywords:

Cr Substitution, Cycleability, Ion Distribution, LiNi_0.5-xCr_2xMn_1.5-xO₄, Mn²⁺ Oxidation

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