Journal Article10.1149/1.1471541
Synthesis, Structure, and Electrochemical Behavior of Li [ Ni x Li1 / 3 − 2x / 3Mn2 / 3 − x / 3 ] O 2
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TL;DR: Li[Ni x Li 1/3 2x/3 Mn 2/3 3/3 ]O 2 for 0 < x ≤ 1/2 is presented in this paper.
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Abstract: The synthesis, structure, and electrochemical performance of Li[Ni x Li 1/3 2/3 Mn 2/3 3/3 ]O 2 for 0 < x ≤ 1/2 is presented. Li[Ni x Li 1/3 2x/3 Mn 2/3 x/3 ]O 2 is prepared by substituting Ni 2+ for Li' and Mn 4+ in Li[Li 1/3 Mn 2/3 ]O 2 while maintaining all the remaining Mn in the +4 oxidation state. Samples with x = 1/6, 1/4, 1/3, 5/12, and 1/2 have been investigated by X-ray diffraction (XRD) and neutron diffraction as well as by electrochemical measurements. The XRD and neutron diffraction patterns of Li[Ni x Li 1/3 2/3 Mn 2/3 x/3 ]O 2 (0 < x ≤ 1/2) show that these compounds adopt the O3-LiCoO 2 -type structure when synthesized at 800°C and higher. XRD and neutron diffraction also suggest a short-range superlattice ordering of Li, Ni, and Mn in the transition-metal layer for many of the samples. When synthesized at 700°C and lower, the compounds (for x = 1/3 and 1/2) appear to adopt a spinel-type structure like LT-LiCoO 2 , Electrochemical studies show that Li[Ni x Li 1/3 2x/3 Mn 2/3 x/3 ]O 2 (900°C) with x = 5/12 can deliver a stable capacity of about 160 mAh/g between 3.0 and 4.4 V vs. Li. An irreversible plateau is observed at about 4.5 V during the first charge of Li/Li[Ni x Li 1/3 2x/3 Mn 2/3 x/3 ]O 2 cells (x = 1/6, 1/4, 1/3, and 5/12), which we believe corresponds to the simultaneous removal of lithium and oxygen from the structure. After the plateau, Li[Ni x Li 1/3 2x/3 Mn 2/3 x/3 ]O 2 cells with x = 1/3 and 5/12 can deliver stable reversible capacities of about 230 and 225 mAh/g between 2.0 and 4.6 V. Li/Li[Ni x Li 1/3 2x/3 Mn 2/3 x/3 ]O 2 (0 < x ≤ 1/2) synthesized at low temperatures (i.e., 600 and 700°C) shows dramatically different differential capacity vs. voltage behavior compared to the high temperature samples, which must he related to the structural differences between materials prepared above and below 750°C.
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