Abstract
Lithium-rich manganese based cathode materials 0.6Li[Li1/3Mn2/3]O2•0.4LiNixMnyCo1-x-yO2 (x < 0.6, y > 0) were synthesized by carbonate co-precipitation and high temperature solid-state reaction. The structures and morphologies of the as-prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM). The results of high temperature in-situ XRD test show that the lattice parameters change significantly with increasing temperature and Ni content. The cation mixing gets serious and the spinel phase appears in the high Ni content samples when the temperature is up to 800 oC. Under voltages ranging from 2.0 to 4.6 V, the lower Ni content sample has the highest discharge capacity of 260.1 mA•g-1 (the initial coulombic efficiency of 83.2%) at current density of 20 mA•g-1, and the discharge capacity retention is up to 99.7% with the relatively smaller voltage decay after 50 cycles.
Graphical Abstract
Keywords
carbonate co-precipitation method, lithium-rich manganese based cathode materials, in-situ X-ray diffraction, cation mixing
Publication Date
2015-10-28
Online Available Date
2015-10-28
Recommended Citation
Hai-Lan FENG, Ya-Fei LIU, Yan-Bin CHEN.
Preparation and Performance of Lithium-Rich Manganese Layered Materials 0.6Li[Li1/3Mn2/3]O2·0.4LiNixMnyCo1-x-yO2(x < 0.6, y > 0)[J]. Journal of Electrochemistry,
2015
,
21(5): 480-487.
DOI: 10.13208/j.electrochem.150743
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol21/iss5/12
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