Conductivity and electrochemical performance of cathode xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2 (x=0.1, 0.2, 0.3, 0.4) at different temperatures

In this work, the conductivity and electrochemical performance of compounds xLi(2)MnO(3)center dot(1 - x)LiMn1/3 Ni1/3Co1/3O2 (x = 0.1, 0.2, 0.3, 0.4) at temperature -10, 25, and 45 degrees C were investigated. Both conductivity and electrochemical performance are dependent on the content of Li2MnO3 (x). The compound with x = 0.3 has a highest AC conductivity of 4.36 x 10 S-6 cm(-1) at room temperature. The conductivity is 8.64 x 10 S-7 cm(-1) at -10 degrees C, one order smaller than 9.98 x 10 (-6) S cm(-1) at 45 degrees C. Furthermore, at a current density of 50 m Ag-1, the compound with composition at x = 0.3 showed an initial discharge capacity of 223.67 mA hg(-1) at room temperature, which increased to 238.08 mA hg(-1) at 45 degrees C and decreased to 114.5 mA hg(-1) when testing temperature was decreased to -10 degrees C. Increasing the conductivity is an effective way to get better electrochemical performances of this kind of compound at different temperatures. (c) 2012 Elsevier B.V. All rights reserved.