Effects of Modified Acetylene Black on Electrochemical Properties of Lithium/Sulfur Batteries
GUO Jin1,2, LI Zhanlong2, LIAN Jinyi2, YAN Xiaoyan1, ZHANG Mingang1,2
1 Institute of Advanced Materials, School of Material Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; 2 Shanxi Engineering Technology Research Center of New Energy Vehicle, Taiyuan 030024, China
Abstract: Modified acetylene black (H-AB) was treated by concentrated nitric acid steam. Then the sulfur/H-AB composite was fabricated by thermal treatment. The results from XRD, FTIR, SEM, TEM and N2 sorption measurements indicated that the surface of acetylene black introduced carboxyl functional groups, and specific surface area and pore size all increased after treated by concentrated nitric acid steam. The sulfur particles were uniformly coated on the acetylene black surface. The electrochemical tests showed that the elemental sulfur and lithium polysulfides were fixed by introducing strong hydrophilic functional groups such as carboxyl groups. Thus the shuttle effect caused by dissolving of lithium polysulfides could be effectively inhibited. At the same time, the contact impedance between active substances and electrolytes could be reduced and the electrochemical performance of the sulfur cathode was improved. The discharge capacity and cycle performance of S/H-AB composite were better than unmodified acetylene black/sulfur composite. After 100 cycles, the discharge capacity still remained at 563 mAh·g-1, much higher than that of sulfur cathode with pristine acetylene black (406.9 mAh·g-1).
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2020, Vol. 34 
