Synthesis and electrochemical characterization of spinel Li[Li_((x-1)/3)Cr_xTi_((5-2x)/3)]O_4 anode materials

摘要

Spinel Li[Li_((x-1)/3)Cr_xTi_((5-2x)/3)]O_4 compounds have been investigated as anode materials for lithium secondary batteries. Li[Li_((x-1)/3)Cr_xTi_((5-2x)/3)]O_4 electrodes (0 ≤ x ≤ 1.0) exhibit a reversible capacity between 163 and 154 m Ah g~(-1) with excellent cycleability. Increase in the amount of Cr ions substituted for Ti ions in the spinel structure decreases the reversible capacity due to a smaller theoretical capacity, but lowers the area specific impedance (ASI) and increases the rate capability.