Acetylene Black/Sulfur Composites Synthesized by a Solution Evaporation Concentration Crystallization Method and Their Electrochemical Properties for Li/S Batteries

Energies

Haibo Tan²  Shengping Wang¹  Du Tao² 

[1] Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China;

关键词: sulfur/carbon composites;    solution evaporation concentration crystallization method;    lithium sulfur batteries;   

DOI  :  10.3390/en6073466

来源: mdpi

【 摘 要 】

A novel technique to prepare carbon/sulfur composites as cathode materials for Li/S batteries is proposed, which we call the ‘solution evaporation concentration crystallization’ method. Three composites with different S loadings were prepared, subject to two different solvent evaporation rates from acetylene black (AB)/sulfur in carbon disulfide solutions. X-ray diffraction, environmental scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller measurements all show that the porous AB structure is well-filled with S. Composites prepared at a lower solvent evaporation rate with 50 wt % S content, had good electrochemical properties, with 1609.67 mAh g⁻¹ in the initial cycle and 1115.69 mAh g⁻¹ after 100 cycles. Composites with better dispersibility at a low solvent evaporation rate can effectively prevent polysulfide from dissolving in the electrolyte, and serve to stabilize the structure of the S cathode during the charge-discharge process.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.