Facile synthesis of Li2ZrO3-modified LiNi0.5Mn0.5O2 cathode material from a mechanical milling route for lithium-ion batteries
Tóm tắt
Li2ZrO3-modified LiNi0.5Mn0.5O2 materials with improved electrochemical performance were directly synthesized by a simple mechanical milling route with ZrO2, Li2CO3 and Ni0.5Mn0.5(OH)2 precursors and a high temperature calcination in air atmosphere. The influences of ZrO2 contents on the microstructures and electrochemical properties of LiNi0.5Mn0.5O2 electrode materials were investigated through X-Ray diffraction, scanning electron microscope, energy dispersive spectroscopy and electrochemical tests. The results showed that ZrO2 can be completely converted into Li2ZrO3 in the form of a coating layer covering the surface of LiNi0.5Mn0.5O2 after a heat treatment process. Li2ZrO3 coating can be formed and dispersed homogenously on the surface of 1 mol% Li2ZrO3-modified LiNi0.5Mn0.5O2 materials. The electrochemical tests confirmed 1 mol% Li2ZrO3-modified LiNi0.5Mn0.5O2 materials exhibited the best discharge capacity of 158.3 mAh g−1 after 100 cycles between 2.75 and 4.35 V at 0.2 C, with an excellent capacity retention of 97.2% and higher discharge capacity at −20 °C than that of the pristine LiNi0.5Mn0.5O2. The enhanced cycling stability and low temperature performance may be attributed to the remarkable synergistic effects of Li2ZrO3 protective layer and its homogeneous distribution on LiNi0.5Mn0.5O2 surface with low Li/Ni cation mixing, high electric conductivity and good structure stability.
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