Mechanical Behavior of Na-Ion Battery Anode Material

Abstract

Na-ion batteries (NIB) are been developed as an alternative to Li-ion batteries due to cost and scarcity of Li metal, but one of the major issues is capacity fade due to stress generation in electrodes during sodiation/desodiation process. Stress generation occurs due to volume expansion of Na when it alloys and dealloys with the anode. Here, we chose Ge as a representative anode material and measured its stress response during sodiation/desodiation cycling. The mechanical behavior of Ge due to sodiaiton/desodiation is compared and contrasted with that due to lithation/delithation. In this talk the interesting observations from this in-situ measurements and their implications will be presented.