Photonic crystals in biology - NanoTR-VI

PPPoster Session, Thursday, June 17Theme F686 - N1123Hydrothermal Synthesis of LiMnR2ROR4R Cathode Active Nanoparticles for Li-ion Batteries11UEmrah BulutUP P* and Mahmut OzacarP1PDepartment of Chemistry, Art and Science Faculty, Sakarya University, Sakarya 54187, TurkiyeAbstract- Spinel LiMnR2ROR4R cathode active nanoparticles for li-ion batteries were synthesized by hydrothermal route at low temperatures. TheLiMnR2ROR4R nanoparticles synthesized via hydrothermal technique were investigated by X-ray diffraction (XRD) and scanning electron microscopyLithium-ion batteries are nowadays widely used forportable systems, such as telephones, computers andtelecommunication devices. One of the most studiedmaterials in this field is spinel lithium manganese oxide(LiMnR2ROR4R), which is considered as a promising alternativeto LiCoOR2R, currently used in the lithium-ion batteries.LiMnR2ROR4R is a cubic spine1 with space group symmetryFd3m. The lithium ions are located on the 8a tetrahedral sitesof the structure; the manganese ions are positioned on the16d octahedral sites. The oxygen ions, which are cubicclose-packed(ccp) occupy the 32e positions.Figure 2. SEM images of LiMnR2ROR4R cathode active nanoparticlesFigure 1. Tunnel structure of spinel LiMnR2ROR4RMoreover, spinel LiMnR2ROR4R has attracted much interest inthe last decade because it presents a phase transition aroundroom temperature attributed to a charge ordering process [1].LiMnR2ROR4R has received much attention as a cathode materialbecause of the high voltage required for lithium insertion andits lower price, availability and better compliance withenvironment compared to LiCoOR2R and LiNiOR2R [2-4]. Inrecent years, nanostructures have received intensive attentionbecause of both their fundamental importance and the widerange of their potential applications in many areas. Most ofthe nanostructured electrode materials are synthesized by thelow-temperature treatment processes such as soft chemical[5], sol-gel [6] and hydrothermal methods [7]. Thehydrothermal synthesis can control the particle size and thecrystalline nature of the product.Here we synthesized LiMnR2ROR4R cathode activenanoparticles. We have chosen the spinel LiMn R2ROR4R becauseit is the most promising cathode material based on low cost,large deposits, and nontoxicity. LiMnR2ROR4R nanoparticlesobtained via hydrothermal synthesis were between 100 and180 nm in range.Figure 3. XRD pattern of spinel LiMnR2ROR4R cathode activenanoparticles*Corresponding author : HTebulut@sakarya.edu.trT[1] J. Rodriguez-Carvajal, G. Rousse, C. Masquelier, M. Hervieu,Phys. Rev. Lett. 81, 4660, (1998).[2] M. M., Thackeray, P. J., Johnson, L. A., Depicciotto, P. G.,Bruce, J. B., Goodenough, Mater. Res. Bull. 19, 179, (1984).[3] Thackeray, M. M.; Dekock, A. J. Solid State Chem. 74, 414,(1988).[4] Jayalakshmi, M.; Mohan Rao, M.; Scholz, F. Langmuir, 19,8403, (2003)[5] J. Luo, Y. Wang, H. Xiong, Y. Xia, Chem. Mater., 19, 4791,(2007).[6] Y. K., Sun, Ind. Eng. Chem. Res., 36, 4839, (1997).[7] H. J., Yuea, X. K., Huanga, D. P., Lva, Y. Yanga,Electrochimica Acta 54, 5363, (2009).6th Nanoscience and Nanotechnology Conference, zmir, 2010 755