In order to better understand the cycling mechanism of metal alloy anodes,and to mitigrate the capacity fade observed in lithium battery use a study of simple systems were initiated.Tiin foil and tin-bismuth mixtures were chosen because there is no need for conductive diluents or binders so that the intrisic behavior could be observed.A pure tin foil was found to react rapidly with lithium,>=3 mA/cm~2,and with no capacity fade for over 10 cycles.This is better than tin powder or electrodeposited tin.After the first cycle,the foil reacts with Li following a stepwise formation of different alloys as dicated by the thermodynamics.
展开▼
