Lithium storage performance enhancement methods of crystalline modulation of Sb2S3 precursors
During the preparation of Sb2S3,precursor particles with varied crystal shapes and sizes were obtained through adjusting reaction temperatures. In particular,the Sb2S3 precursor particles synthesized at 60 ℃ processed moderate particle size and the best capacity retention after cycling. After further heat treatment for the Sb2S3-60 ℃ precursor,the as-prepared rod structure shows smooth surfaces with fewer defects and uniform distribution. Notably,Sb2S3-60 ℃-H@C exhibits the initial discharge capacity of 916 mA·h·g-1 at 0.1 A/g,with the capacity retention close to 90％ after cycling for 50 loops. Moreover,its rate capacity can be maintained to be 496 mA·h·g-1 at 5 A/g,indicating its great electrochemical reversibility. Apparently,the materials synthesized at 60 ℃ display rapid ion diffusion kinetics and robust structures,effectively buffering volume expansion and polysulfide shuttling,resulting in excellent lithium-ion storage performances. Therefore,optimizing the synthesis conditions of Sb2S3 precursors(containing the morphology,particle size and other internal properties) is important in the preparation of high-performance lithium-ion battery anodes.
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