SnSe alloy as a promising anode material for Na-ion batteries

Abstract

SnSe alloy is examined for the first time as an anode for Na-ion batteries, and shows excellent electrochemical performance including a high reversible capacity of 707 mA h g⁻¹ and stable cycle performance over 50 cycles. Upon sodiation, SnSe is changed into amorphous Na_xSn nanodomains dispersed in crystalline Na₂Se, and SnSe is reversibly restored after desodiation.