Mesoporous carbon/sulfur composite with N-doping and tunable pore size for high-performance Li-S batteries |
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Authors: | Xueliang Li Yiyi Wang Congsheng Xu Lisheng Pan |
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Institution: | 1.School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei,People’s Republic of China;2.Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering,Hefei,People’s Republic of China |
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Abstract: | Mesoporous carbons (MCs) were used as the matrixes to load sulfur for lithium sulfur (Li-S) batteries, and pore sizes were tuned by heat treatment at different high temperatures. The cathode material shows the highest discharge capacity of 1158.2 mAh g?1 at the pore size of 4.1 nm among as-prepared nitrogen-free materials with different sizes. Meanwhile, the nitrogen doping of mesoporous carbon helps to inhibit the diffusion of polysulfide species via an enhanced surface adsorption. The carbon/sulfur containing N (4.56%) shows a high initial discharge capacity of 1315.8 mAh g?1 and retains about 939 mAh g?1 after 100 cycles at 0.2 C. The improved electrochemical performance is ascribed to the proper pore size, surface chemical property, and conductivity of the N-doped carbon material. |
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