Abstract
LiCo x Mn2−x O4 cathode materials for lithium ion batteries were synthesized by mechanical activation-solid state reaction at 750°C for 24 h in air atmosphere, and their crystal structure, morphology, element composition and electrochemical performance were characterized with XRD, SEM, ICP-AES and charge-discharge test. The experimental results show that all samples have a single spinel structure, well formed crystal shape and uniformly particle size distribution. The lattice parameters of LiCo x Mn2−x O4 decrease and the average oxidation states of manganese ions increase with an increase in Co content. Compared with pure LiMn2O4, the LiCo x Mn2−x O4 (x=0.03–0.12) samples show a lower special capacity, but their cycling life are improved. The capacity loss of LiCo0.09Mn1.91O4 and LiCo0.12Mn1.88O4 is only 1.85% and 0.95%, respectively, after the 20th cycle. The improvement of the cycle performance is attributed to the substitution of Co at the Mn sites in the spinel structure, which suppresses the Jahn-Teller distortion and improves the structural stability.
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Funded by the Foundation of Key Laboratory of Yunnan Province (No.14051038)
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Yao, Y., Dai, Y., Yang, B. et al. Synthesis and characterization of LiCo x Mn2−x O4 cathode materials. J. Wuhan Univ. Technol. 22, 307–310 (2007). https://doi.org/10.1007/s11595-005-2307-4
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DOI: https://doi.org/10.1007/s11595-005-2307-4