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The high-voltage spinel is a promising cathode material in next generation of lithium-ion batteries. Samples LiNi0.5 − xMn1.5 + xO4 (x = 0, 0.05, 0.1) are synthesized by a simple co-precipitation method, in which pH value and temperature conditions do not need control. In the simple co-precipitation method, NaHCO3 solution is poured into transition metal solution to produce precursor. Ni and Mn are...
The Ni/Mn ratios are changed to improve rate performance of high-voltage spinel. LiNi0.5Mn1.5O4 and LiNi0.4Mn1.6O4 with annealed treatment are prepared. The structural evolutions during delithiation/lithiation are studied by in-situ XRD technique. It is found that the decrease of Ni/Mn ratios can change the structural evolutions from two-phase transformations to solid-solution reaction. The variations...
Samples LixNi0.5Mn1.5O4 (x = 0.8, 0.9, 1.0, 1.1, and 1.2) are synthesized to study the effects of Li contents. When Li contents are not enough, part of the nickel-manganese oxides cannot transfer to LiNi0.5Mn1.5O4 and remain in the product. When Li contents are too much, small amount of lithium-rich oxide is formed. In voltage window of 3.5~4.95 V, Li1.0Ni0.5Mn1.5O4 has the best rate performance due...
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