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="" 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.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="">doi:10.1016/j.electacta.2003.09.034</a> <a target="_blank" rel="external noopener" href="">fatcat:pqdltkyyrncmfkkizwqs4h5pmq</a> </span>
<a target="_blank" rel="noopener" href="" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href=""> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> </button> </a>