Available online 8 November 2013
Structural, Electrical and Electrochemical Characterization of LiLa0.01Cr0.13Mn1.86O4 Cathode Material for Lithium-ion Battery
- a Department of Physics, College of Natural Science, Arba Minch University, Arba Minch, Ethiopia
- b Department of Physics, College of Science and Technology, Andhra University, Visakhapatnam, India
- Received 12 August 2013
- Revised 15 October 2013
- Accepted 24 October 2013
- Available online 8 November 2013
Well-crystallized cathode material is successfully synthesized.
The room temperature bulk conductivity is 2.7×10−5 S/cm.
The bulk conductivity obeys Arrhenius law with activation energy of 0.34 eV.
The sample shows the negative temperature coefficient of resistance (NTCR) type behavior.
The cathode material exhibits acceptable capacity retention performance.
The LiLa0.01Cr0.13Mn1.86O4 cathode material is successfully synthesized by solid-state reaction method. The X-ray diffraction (XRD) pattern reveals that the synthesized sample belongs to Fdm space group with spinel structure. From FT-IR study of the material, two distinct strong absorption peaks are detected. From the electrical properties studies, it is found that the bulk conductivity of LiLa0.01Cr0.13Mn1.86O4 obeys Arrhenius principle with activation energy of 0.34 eV. The value of the real impedanceZ′decreases at lower frequency with increasing temperature, indicating the negative temperature coefficient of resistance (NTCR) type behavior of the sample. The variation of the bulk resistance and dc conductivity as a function of temperature, and the variation of the ac conductivity and the real dielectric constant ε′as a function of frequency are also reported. The charge/discharge curves show two plateaus with initial discharge capacity of 107.6 mAh g−1. After 15 cycles, LiLa0.01Cr0.13Mn1.86O4 cathode is able to retain 95.1% of its initial capacity.