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 shu

Preparation and Electrochemical Performance of LiTi₂(PO₄)₃/C Composite Cathode for Lithium Ion Batteries

1.
Li-Ion Batteries Laboratory, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China

Received Date: 18 November 2011
Available Online: 1 March 2012
Fund Project: 中央高校基本科研业务费专项资金(2010LKHX03, 2010QNB04, 2010QNB05) (2010LKHX03, 2010QNB04, 2010QNB05)中国矿业大学培育学科创新能力提升基金(2011XK07)资助项目 (2011XK07)

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.
- LiTi₂(PO₄)₃/C composite material,
- Electrochemical impedance spectroscopy,
- Solid electrolyte interface film,
- Contact resistance,
- Phase transformation,
- Diffusion coefficient
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Preparation and Electrochemical Performance of LiTi₂(PO₄)₃/C Composite Cathode for Lithium Ion Batteries