Electrochemical properties of spinel LiMn1.92-xCu0.08NixO4 cathode material prepared by a solution combustion method

Yonggen Li; Jianqiang Zhang; Yin Liu; Wei Jiang; Mei Chen

doi:10.62051//ijmsts.v1n1.10

Authors

Yonggen Li
Jianqiang Zhang
Yin Liu
Wei Jiang
Mei Chen

DOI:

https://doi.org/10.62051//ijmsts.v1n1.10

Keywords:

Spinel lithium manganate; Solution combustion method; Ni-doping; Cathode material.

Abstract

A series of Ni-Cu co-doped spinel LiMn_1.92-xCu_0.08Ni_xO₄ cathode materials were successfully synthesized by a solution combustion method. X-ray diffraction (XRD) spectra showed that all the as-prepared LiMn_1.92-xCu_0.08Ni_xO₄ samples belong to spinel LiMn₂O₄ structure without any impurity phase. Scanning electron microscopy (SEM) showed that the particle size of the samples decreased with the increase of Ni-doping amount, and the crystallinity increased gradually. The galvanostatic charge/discharge tests results showed that the LiMn_1.86Cu_0.08Ni_0.06O₄ sample shows excellent rate performance and cyclic stability. At room temperature and 1 C, the initial discharge specific capacity of LiMn_1.86Cu_0.08Ni_0.06O₄ was 103.4 mAh g^-1, and the capacity retention rate of 67.80% was obtained after 1000 cycles, which was higher than 49.60% of LiMn₂O₄. Even at high current densities of 5 C and 10 C, the good capacity retention rates of 73.55% and 67.29% for LiMn_1.86Cu_0.08Ni_0.06O₄ sample were obtained after 1000 cycles, respectively.

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