Abstract

CHEN, Zhaoyong et al. Performance and structure of LiNi_0.5Mn_1.5O₄ prepared from various Ni precursors for lithium ion batteries. S.Afr.j.chem. (Online) [online]. 2008, vol.61, pp.157-161. ISSN 1996-840X.

LiNi_0,5Mn_1,5O₄ compounds were prepared through a solid-state reaction using various Ni precursors. The effect of the precursors on the electrochemical performance of LiNi_0,5Mn_1,5O₄ was investigated. LiNi_0,5Mn_1,5O₄ made from Ni(NO₃)₂ ● 6H₂O shows the best charge-discharge performance. The reversible capacity of LiNi_0,5Mn1_,5O₄ is about 145 mA h g^-1 and remained at 143 mA h g^-1 after 10 cycles at 3.0 to 5.0 V. The XRD results showed that the precursors and dispersion method had significant effects on their structures. Pure spinel phase can be obtained with a high energy ball-milling method and Ni(NO₃)₂●6H₂O as precursor. A trace amount of the NiO phase was detected in LiNi_0,5Mn_1,5O₄ with the manual grinding method when Ni(CH₃COO)₂●6H₂O, NiO and Ni₂O₃ were used as precursors.

Keywords : LiNi_0,5Mn_1,5O₄; spinel; cathode materials; lithium ion battery.

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