High Capacity Alloy/Carbon Composite Electrode for Lithium ion Batteries

Sub-micron size metallic particles were finely deposited on the surface of Carbonaceous Mesophase Spherules (CMS) by the decomposition and reduction of organic metallic compound by solid-state reaction. Electrochemical cycling tests of coin cells show that the capacity retention at the 30th cycle is 90%, and special capacity is over 430 mAh g-1, improving about 40% versus pure CMS electrode. Obtained Alloy/CMS composite powders with high special capacity are used as anode materials for lithium ion cells and can avoid the drastic volume change when lithium inserting into and extracting from Alloy matrix, and improve the cycle performance of electrode.