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Sulfur-doped 3D hierarchical porous carbon network toward excellent potassium-ion storage performance

Dan Wang  Kang-Hui Tian  Jie Wang  Zhi-Yuan Wang  Shao-Hua Luo  Yan-Guo Liu  Qing Wang  Ya-Hui Zhang  Ai-Min Hao  Ting-Feng Yi  
【摘要】:Carbonaceous materials are promising anode candidates for potassium-ion batteries, but currently the unsatisfactory cycling and rate performances due to the sluggish diffusion kinetic and serious structure damage during K~+ insertion/extraction limit their practical application. Herein, a series of sulfur-doped porous carbons(SPCs) were prepared via a template-assisted freeze-drying followed by the carbonization and sulfuration processes at different temperatures. Among the three as-synthesized samples, SPC-600 exhibits the highest specific capacity(407 mAh·g~(-1) at 0.10 A·g~(-1)), the best rate(242 mAh·g~(-1) at 2.00 A·g~(-1)) and cycling performance(286 m Ah·g~(-1) after 800 cycles at 0.50 A·g~(-1)). All the SPCs display higher capacities than the undoped carbon materials. The excellent electrochemical performance of SPC can be ascribed to the abundant three-dimensional porous structure together with S-doping in the disordered carbon, which is favor of providing adequate reaction active sites as well as fast ion/electron transport paths. The density functional theory(DFT) calculations further demonstrate that the sulfurdoping can promote K-ion adsorption and storage. Meanwhile, the kinetic analyses reveal that surface-induced capacitive mechanism dominates the K-ion storage process in SPCs, which contributes to ultrafast charge storage. This work provides an effective strategy for fabricating highperformance potassium-ion storage electrode materials.

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