Abstract
A spherical porous carbon (SPC) with high specific surface area is prepared by spray pyrolysis at 800 °C followed by removing silica template. The prepared SPC is employed as a conductive matrix in the sulfur cathode (S-SPC) for lithium–sulfur secondary batteries. The BET surface area of the prepared SPC sample is as high as 1,133 m2 g−1 and the total pore volume is 2.75 cm3 g−1. The electrochemical evaluations including charge–discharge tests, cyclic voltammograms (CV), and electrochemical impedance spectrum suggest that the prepared S-SPC composite presents superior electrochemical stability when compared to the S-SP cathode. The as-prepared S-SPC composite shows improved cycle performance. The reversible discharge capacity is about 637 mAh g−1 after 50 cycles, which is much better than that of the as-prepared sulfur–Super P carbon black composite. It may be attributed to the high porosity and excellent conductive structure of the SPC.
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This study was supported by the Fundamental Research Funds for the Central Universities (grant no. 2012QNZT023) and by General Science and Technology Plan of China Hunan Provincial Science & Technology Department (grant no. 2011FJ3151).
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Zhang, K., Li, J., Li, Q. et al. Synthesis of spherical porous carbon by spray pyrolysis and its application in Li-S batteries. J Solid State Electrochem 17, 3169–3175 (2013). https://doi.org/10.1007/s10008-013-2229-6
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DOI: https://doi.org/10.1007/s10008-013-2229-6