'Metal nanoconfinement' in porous carbons: a valuable concept toward highly performing electrode materials for Li+ ion batteries

摘要

Tin has particularly attracted great attention for Li-ion batteries applications owing to its high theoretical capacity (990 mAh/g) compared to that of graphite. However, Sn presents a major drawback related to its large volume expansion upon the lithiation process (about 300%), which leads to rapid agglomeration of Sn particles and consequently to the decrease of Li storage capacity, loss of contact with the current collector, and finally loss of the cycling performance. In this work, we have prepared a SnO2/C composite with SnO2 particles confined inside the pores of a carbon network in order to accommodate the volume changes upon lithiation/delithiation.