Improvement of cycle behaviour of SiO/C anode composite by thermochemically generated Li4SiO4 inert phase for lithium batteries

A new anode composite material is prepared by thermal treatment of a blend made of silicon monoxide (SiO) and lithium hydroxide (LiOH) at 550 degrees C followed by ball milling with graphite. X-ray diffraction pattern confirms the presence of Li4SiO4 in the thermally treated (SiO + LiOH) material. The electrode appears to be smooth and glassy as evident from observation with a scanning electron microscope (SEM), possibly due to the presence of nano-silicon and Li4SiO4 particles, and exhibits superior performance with a charge capacity of similar to 333 mAh g(-1) at the 100th cycle with a low-capacity fade on cycling. Cyclic voltammograms of the electrode predict high power capability. On the other hand, the electrode comprising of only SiO and C prepared through ball milling, devoid of Li4SiO4. shows hard crust particulates in the electrode exhibiting low charge-discharge capacities with cycling. (C) 2008 Elsevier B.V. All rights reserved.