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High-content of sulfur uniformly embedded in mesoporous carbon: a new electrodeposition synthesis and an outstanding lithium–sulfur battery cathode

Zhang, Liyuan, Huang, Hui, Xia, Yang, Liang, Chu, Zhang, Wenkui, Luo, Jianmin, Gan, Yongping, Zhang, Jun, Tao, Xinyong, Fan, Hong Jin
Journal of materials chemistry A 2017 v.5 no.12 pp. 5905-5911
batteries, carbon, cathodes, chemical bonding, commercialization, electrochemistry, porous media, sulfur
We report a novel synthesis of a mesoporous carbon–sulfur composite (MCSC) by electrodeposition of sulfur into the mesopores via a self-limiting process. With the merits of a high sulfur content (77%), uniform distribution and strong C–S bonds achieved by this method, the as-prepared materials demonstrate excellent performance in lithium–sulfur batteries. The electrode delivers high specific capacities at various C-rates (e.g. about 1160 and 590 mA h g⁻¹ at current densities of 0.1 and 2.0 A g⁻¹, respectively) and remarkable capacity retention, remaining above 857 mA h g⁻¹ after 200 cycles at a high rate of 0.5 A g⁻¹. This electrochemical strategy is industrially viable and scalable, and thus may pave a new way to push the commercialization of Li–S batteries.