摘要 : Antimony-based materials represent promising anode materials for sodium ion batteries(SIBs)owing to their high theoretical capacity,however,the large volume expansion and low ionic conductivity during the electrochemical process p... 展开 Antimony-based materials represent promising anode materials for sodium ion batteries(SIBs)owing to their high theoretical capacity,however,the large volume expansion and low ionic conductivity during the electrochemical process prohibit them from reaching their theoretical expectations.In this work,Sb2S3@C and Sb2Se3@C nanodots with uniform diameters of 19.0 nm and 20.7 nm were synthesized by H2/C thermal reduction and co-sulfurization(selenization)of sodium stibogluconate.Each Sb2S3 and Sb2Se3 nanodot was coated by an interconnecting carbon network with weak graphitization,which further crosslinked together to form a high conductive framework.When applied as anode for SIBs,they exhibited desired sodium storage properties,especially the excellent cycling stability of Sb2Se3@C nanodots with a reversible capacity of 316.1 mA h g~(-1)after 100 cycles at 100 mA g~(-1)and 269.1 mA h g~(-1)after 200 cycles at 1 A g~(-1),which was consistent with the calculated result of theoretical volume changes(264% and 246%)and density functional theory(DFT)calculation for both materials during the Na+ intercalation processes,as expected. 收起