Citation: YUAN Zheng, CUI Yong-Li, SHEN Ming-Fang, QIANG Ying-Huai, ZHUANG Quan-Chao. Preparation and Electrochemical Performance of LiTi2(PO4)3/C Composite Cathode for Lithium Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2012, 28(05): 1169-1176. doi: 10.3866/PKU.WHXB201203012
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LiTi2(PO4)3/C composite with a Na+ superionic conductor (NASICON)-type structure was prepared by a sol-gel method. The LiTi2(PO4)3/C composite had a od NASICON structure and od electrochemical properties as revealed by X-ray diffraction (XRD), scanning electron microscopy (SEM), charging/discharging tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The first discharge capacity was 144 mAh·g-1. The EIS results indicated that there appeared semicircles respectively representing the solid electrolyte interface (SEI) film as well as the contact resistance, charge transfer resistance, and phase transformation resistance in the initial lithiation process of LiTi2(PO4)3/C composite electrode. The chemical diffusion coefficients of intercalation and de-intercalation of Li+ in the LiTi2(PO4)3 cathode material were calculated to be 2.40×10-5 and 1.07×10-5 cm2·s-1, respectively.
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