Improved Electrochemical Performance of Highly Ordered LiMPO4@C Nanotube

Abstract

Recently, lithium metal phosphates have been focused as a potential cathode for lithium-ion batteries on account of their non-toxicity, cost effectiveness and better stable characteristics. However, very low charge-discharge current densities have rendered the practical use of LiMPO4 as a cathode for lithium ion batteries. The poor electrochemical performance of LiMPO4 at high current densities is attributable to the low intrinsic electronic conductivity and the slow lithium ion diffusion kinetics within the grains. In order to meet the demand of future electrochemical energy storage system, such as high energy density at hig powder demands, heterogeneous nanostructured materials are currently studied as promising electrode materials. Their synergic properties arise from integrating multi-nanocomponents, each tailored to address a specific demand (e.g., high energy density, high conductivity, and excellent mechanical stability). In this research, we discuss the synthesis and electrochemical performance of one-dimensional nanomaterials. Highly aligned LiMPO4 nanotube covered with CNT is synthesized using AAO template. The synthesized LiMPO4 nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmissing electron microscopy (TEM). The electrochemical performances of the various samples were compared with the consideration of structure of the core-shell nanotube structure.