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Karthikprabhu, S.,Karuppasamy, K.,Vikraman, Dhanasekaran,Prasanna, K.,Maiyalagan, T.,Nichelson, A.,Kathalingam, A.,Kim, Hyun-Seok Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.449 No.-
<P><B>Abstract</B></P> <P>This study demonstrated to synthesis of carbon-free lithium nickel phosphate (LiNiPO<SUB>4</SUB>) and its analogue of manganese doped LiNi<SUB>1−x</SUB>Mn<SUB>x</SUB>PO<SUB>4</SUB> (x = 0.05–0.2) cathode materials by a facile polyol method and their suitability for use in high voltage lithium ion batteries (LIBs). The physicochemical properties were analyzed using X-ray diffraction, Fourier transform infra-red, Raman, field emission scanning electron microscopy (FE-SEM), energy dispersive analysis by X-ray (EDX), and electrochemical studies. FE-SEM showed that the spherical shape particles were uniformly distributed on the surface and EDX confirmed the presence of all the elements in the LiNi<SUB>1−x</SUB>Mn<SUB>x</SUB>PO<SUB>4</SUB> nanostructure. Substitution of Mn dopants with LiNiPO<SUB>4</SUB> significantly improved the electrical and electrochemical performances for LiNi<SUB>1−x</SUB>Mn<SUB>x</SUB>PO<SUB>4</SUB> (x = 0.05–0.2) cathodes. The highly conducting LiNi<SUB>1−x</SUB>Mn<SUB>x</SUB>PO<SUB>4</SUB> (x = 0.1) cathode exhibited initial discharge capacity of 94.2 mA h g<SUP>−1</SUP> at <I>C</I>/4 rate, and 62% capacity retention after 100 cycles between 2.8 and 5.6 V. These features promote LiNi<SUB>1−x</SUB>Mn<SUB>x</SUB>PO<SUB>4</SUB> as a suitable cathode material for high voltage LIBs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon free, LiNiPO<SUB>4</SUB> and Mn doped LiNiPO<SUB>4</SUB> were prepared by a polyol process. </LI> <LI> The Mn doped LiNiPO<SUB>4</SUB> shows the improved electrical performances. </LI> <LI> The CV polarization curve was ascertained in the voltage range of 2.8–5.6 V. </LI> <LI> The cell delivers a maximum discharge capacity of 94.2 mA h g<SUP>−1</SUP> at 0.1 C rate. </LI> </UL> </P>