Abstract
Metal sulfides have attracted tremendous attention as electrode materials for sodium-ion batteries due to their high theoretical capacity. In this article, Ag2S nanospheres with 70 nm diameter were prepared by a hydrothermal method. Compared with the bulk Ag2S, the as-prepared Ag2S nanospheres deliver the capacity of 198 mAh/g after 100 cycles at 1C, exhibiting excellent cycling and rate performance as the electrode material for sodium-ion batteries. The remarkable electrochemical performance can be attributed to the shorter Na+ diffusion path in Ag2S nanospheres. Structural characterization reveals that the sodiation processes of Ag2S include intercalation and conversion reactions, which were confirmed by potential relaxation technique (PRT) measurements.
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