Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (07): 1666-1672.doi: 10.3866/PKU.WHXB20110715

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Electrochemical Performance of Cr2O3/TiO2 Composite Material for Lithium Ion Batteries

ZHAO Xing, ZHUANG Quan-Chao, QIU Xiang-Yun, XU Shou-Dong, SHI Yue-Li, CUI Yong-Li   

  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:2011-02-24 Revised:2011-03-30 Published:2011-06-28
  • Contact: ZHUANG Quan-Chao E-mail:zhuangquanchao@126.com
  • Supported by:

    The project was supported by the Fundamental Research Funds for the Central Universities, China (2010LKHX03, 2010QNB04, 2010QNB05) and Science and Technology “Climbing” Program of China University of Mining and Technology (ON090237).

Abstract:

The Cr2O3/TiO2 composite material was prepared by a high-temperature solid-state reaction and its structure, morphology, and electrochemical performance were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), charge-discharge test, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). We found that TiO2 doping significantly improved the cyclic performance of Cr2O3 and the reversible capacity of the Cr2O3/TiO2 composite material was 454 mAh·g-1 after 22 charge-discharge cycles, therefore, it has a capacity retention of 73.6% and this is mainly due to TiO2 doping that significantly increases the conductivity of Cr2O3. Our results revealed that the initial large irreversible capacity and the capacity fading could be attributed to an increase in the thickness of the solid electrolyte interface (SEI) film and a reduction in the conductivity of the materials. This was caused by a volume expansion of the Cr2O3/TiO2 electrode during the first discharge process.

Key words: Lithium ion battery, Cr2O3/TiO2 composite material, Conversion reaction, Conductivity, Solid electrolyte interface film

MSC2000: 

  • O646