Electrocatalysis of S-doped carbon with weak polysulfide adsorption enhances lithium-sulfur battery performance.
作者信息
Du Lingyu, Cheng Xueyi, Gao Fujie, Li Youbin, Bu Yongfeng, Zhang Zhiqi, Wu Qiang, Yang Lijun, Wang Xizhang, Hu Zheng
机构信息
Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
出版信息
Chem Commun (Camb). 2019 May 30;55(45):6365-6368. doi: 10.1039/c9cc02134e.
Heteroatom-doped nanocarbons are beneficial for the performance improvement of lithium-sulfur batteries, and the reason is usually attributed to their strong adsorption to the soluble polysulfides. Herein, we found that, despite the weak polysulfide adsorption on hierarchical S-doped carbon nanocages (hSCNCs), the hSCNC-encapsulated sulfur cathode still exhibited better performance than the counterpart using undoped carbon nanocages, showing a high capacity of 579 mA h g-1 at 2 A g-1 after 400 cycles, and a high areal capacity of 4.7 mA h cm-2 with a high sulfur loading of 4.5 mg cm-2. The electrocatalysis-promoted mechanism of S-doped carbon was demonstrated, which facilitated polysulfide conversion and suppressed the polarization effect, thereby leading to superior performance.
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