Cycling behaviour of LiCoO_2 cathode materials prepared by PAA-assisted sol-gel method for rechargeable lithium batteries

摘要

High-tCmperature LiCoO_2 powders with sub-micron, narrow particle-size distributions, and excellent phase-pure particles are synthesized from molecularly mixed amorphous gel precursors by a sol-gel method. The crystallinity and morphology of the powders are examined by means of X-ray diffraction, Rietveld refinement and scanning electron microscopy, respectively. LiCoO_2 powders using poly(acrylic acid) deliver a high initial discharge capacity of l33 mA h g~-1 and retain 97/100 of the initial discharge capacity after 350 cycles in Li/l M LiPF_6-EC/DEC//LiCoO_2 cells.