LiNi Mn O powder was successfully synthesised via ball-milling, followed by calcination at temperatures of 750, 850 and 0.5 1.5 4 950 °C. The physical and electrochemical properties of LiNi Mn O powder were characterised by X-ray diffraction, scanning 0.5 1.5 4 electron microscopy, transmission electron microscopy and galvanostatic charge/discharge. At a 1 C rate, LiNi Mn O 0.5 1.5 4 −1 −1 annealed at 750 °C displays the highest discharge capacity of 81 mAh g at the first cycle and 86 mAh g after 100 cycles. The smaller particle size presented by this LiNi Mn O markedly enhances the rate capability by allowing sufficient contact 0.5 1.5 4 between the active material and the electrolyte, which is beneficial for maximum diffusion and transportation of the lithium ion in the electrode. . . . . Keywords Lithium-ion batteries LiNi Mn O Ball-milling Discharge capacity Rate capability 0.5 1.5 4 −1 Introduction reversible capacity (~ 130 mAh g ) and high energy den- −1 sity(~650Whkg )comparedwithcommercialLiCoO −1 −1 Developing a new cathode material with high energy density is (518 Wh kg )and LiMn O (~400Whkg )[10, 11]. 2 4 a challenge for researchers in order to replace the current cath-
Ionics – Springer Journals
Published: May 30, 2018
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