High sulfur loading is a practical way to realize the advantages of high energy density lithium-sulfur(Li-S)batteries.Herein,we report a biomass-derived flexible self-supporting carbon(SSC)coupled with Ni S/C used as ...High sulfur loading is a practical way to realize the advantages of high energy density lithium-sulfur(Li-S)batteries.Herein,we report a biomass-derived flexible self-supporting carbon(SSC)coupled with Ni S/C used as a sulfur host for high-efficiency sulfur storage.A high areal sulfur loading of 5.3 mg cm-2can be achieved in the as-prepared composite host,and physical/chemical dual blocking effects for polysulfides are implemented in the SSC-Ni S/C electrode.The 3D SSC with an interwoven structure offers a large surface area and wide internal space for sulfur accommodation.Moreover,the powerful capability of physical immobilization/chemical anchoring of the polysulfides endowed by SSC and Ni S mitigates the shuttle effect.We compared electrodes with different current collectors,and the SSC-Ni S/C-1200 electrode material showed outstanding electrochemical performance,exhibiting a first specific capacity of 1268.36 m A h g-1at a high sulfur loading of 5.3 mg cm-2.Additionally,the SSC-Ni S/C-1200 electrode exhibited a good remaining capacity of 555.15 m A h g-1at a current density of0.5 A g-1with a high sulfur loading of 3.3 mg cm-2after 300 cycles.In addition,the active material loaded in the traditional way easily falls off when the conventional current collector is folded with increasing sulfur loading,but the flexible self-supporting carbon current collector can solve this problem.This study prepared a flexible free-standing 3D interconnected carbon current collector.Via the introduction of amorphous carbon-coated Ni S,the self-supporting cathode SSC-Ni S/C-1200 achieved high sulfur loading that results in excellent electrochemical performance,providing a reference for future research on high sulfur loading in lithium-sulfur batteries.展开更多
A facile method for the synthesis of pillar[6]arenes was developed. A series of pillar[6]arenes were prepared with FeC13 as catalyst and chloroform as solvent at room temperature in moderate yields （30%-40%）. Their ...A facile method for the synthesis of pillar[6]arenes was developed. A series of pillar[6]arenes were prepared with FeC13 as catalyst and chloroform as solvent at room temperature in moderate yields （30%-40%）. Their host-guest properties with n-cetyltrimethyl ammonium bromide were investigated by 1 HNMR. The results showed that high selectivity in the host-guest relationship became apparent between pillar[6]arenes and pillar[5]arenes based on the different size of the inner cavity.展开更多
基金financially supported by the Major Science and Technology Projects of Yunnan Province(Grant No.202202AG050003)the Key Research and Development Program of Yunnan Province(Grant No.202103AA080019)+2 种基金the National Natural Science Foundation of China(Grant Nos.51904135,52162030)the Scientific Research Fund of Highend Talents Introduction of Kunming University of Science and Technology(Grant No.KKKP201752027)the Yunnan Thousand Talents Program for Young Talents(Grant No.KKS2202052001)。
文摘High sulfur loading is a practical way to realize the advantages of high energy density lithium-sulfur(Li-S)batteries.Herein,we report a biomass-derived flexible self-supporting carbon(SSC)coupled with Ni S/C used as a sulfur host for high-efficiency sulfur storage.A high areal sulfur loading of 5.3 mg cm-2can be achieved in the as-prepared composite host,and physical/chemical dual blocking effects for polysulfides are implemented in the SSC-Ni S/C electrode.The 3D SSC with an interwoven structure offers a large surface area and wide internal space for sulfur accommodation.Moreover,the powerful capability of physical immobilization/chemical anchoring of the polysulfides endowed by SSC and Ni S mitigates the shuttle effect.We compared electrodes with different current collectors,and the SSC-Ni S/C-1200 electrode material showed outstanding electrochemical performance,exhibiting a first specific capacity of 1268.36 m A h g-1at a high sulfur loading of 5.3 mg cm-2.Additionally,the SSC-Ni S/C-1200 electrode exhibited a good remaining capacity of 555.15 m A h g-1at a current density of0.5 A g-1with a high sulfur loading of 3.3 mg cm-2after 300 cycles.In addition,the active material loaded in the traditional way easily falls off when the conventional current collector is folded with increasing sulfur loading,but the flexible self-supporting carbon current collector can solve this problem.This study prepared a flexible free-standing 3D interconnected carbon current collector.Via the introduction of amorphous carbon-coated Ni S,the self-supporting cathode SSC-Ni S/C-1200 achieved high sulfur loading that results in excellent electrochemical performance,providing a reference for future research on high sulfur loading in lithium-sulfur batteries.
基金supported by the National Natural Science Foundation ofChina (20872038,21072064)
文摘A facile method for the synthesis of pillar[6]arenes was developed. A series of pillar[6]arenes were prepared with FeC13 as catalyst and chloroform as solvent at room temperature in moderate yields （30%-40%）. Their host-guest properties with n-cetyltrimethyl ammonium bromide were investigated by 1 HNMR. The results showed that high selectivity in the host-guest relationship became apparent between pillar[6]arenes and pillar[5]arenes based on the different size of the inner cavity.
