Novel synthesis of layered LiNi1/2Mn1/2O2 as cathode material for lithium rechargeable cells

S. Gopukumar, Kyung Yoon Chung, Kwang Bum Kim
<span title="">2004</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/4nax3wfe4bf3tk7ak4ghw5ho2e" style="color: black;">Electrochimica Acta</a> </i> &nbsp;
10 A new solution combustion synthesis of layered LiNi 0.5 Mn 0.5 O 2 involving the reactions of LiNO 3 , Mn(NO 3 ) 2 , NiNO 3 , and glycine as starting materials is reported. TG/DTA studies were performed on the gel-precursor and suggest the formation of the layered LiNi 0.5 Mn 0.5 O 2 at low temperatures. The synthesized material was annealed at various temperatures, viz., 250, 400, 600, and 850 • C, characterized by means of X-ray diffraction (XRD) and reveals the formation of single phase
more &raquo; ... ystalline LiNi 0.5 Mn 0.5 O 2 at 850 • C. The morphology of the synthesized material has been investigated by means of scanning electron microscopy (SEM) and suggests the formation of sub-micron particles. X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV) studies on the synthesized LiNi 0.5 Mn 0.5 O 2 powders indicate that the oxidation states of nickel and manganese are +2 and +4, respectively. Electrochemical galvanostatic charge-discharge cycling behavior of Li//LiNi 0.5 Mn 0.5 O 2 cell using 1 M LiPF 6 in EC/DMC as electrolyte exhibited stable capacities of ∼125 mAh/g in the voltage ranges 2.8-4.3 V and 3.0-4.6 V and is comparable to literature reports using high temperature synthesis route. The capacity remains stable even after 20 cycles. The layered LiNi 0.5 Mn 0.5 O 2 powders synthesized by this novel route have several advantages as compared to its conventional synthesis techniques.
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