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spatially Interlinked Graphene with Uniformly Loaded sulfur for High Performance li-s Batteries

Chinese Journal of Chemistry 2016年第1期34卷 41-45页

作者： Donghai liu Chen Zhang Xiaohui Lv Xiaoyu Zheng Lei Zhang linjie Zhi Quan-Hong Yang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical science and Engineering (Tianjin) Tianjin 300072 China National Center for Nanoscience and Technology Beijing 100190 China

lithium-sulfur （li-s） batteries have drawn extensive attentions due to their high energy density, environmental friendliness and low cost. In this study, three-dimensional （3D） graphene/s hybrid （G/s） is prepared by a one-pot hydrothermal method together with redox reaction between s-based compound and graphene oxide （GO）. G/s has a three dimensional porous structure, where graphene is interconnected with each other forming a 3D conductive network. It demonstrates that the pore structure of G/s can be well controlled by optimizing the drying method of the 3D graphene-based materials. Freeze drying and evaporation-induced drying can induce different density and pore structure of G/s. Electrochemical tests illustrate that the resulting hybrid can deliver a specific capacity of 891 mAh·g^-1 and 575 mAh·g^-1 for the 1^st and 100^th cycle at a current density of 500 mAh·g^-1 .

关键词： li-s battery graphene three-dimensional graphene/s hybrid different drying methods

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A sandwich-type sulfur Cathode Based on Multifunctional Ceria Hollow spheres for High-Performance lithium-sulfur battery

A Sandwich-type Sulfur Cathode Based on Multifunctional Ceri...

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中国化学会第十届全国无机化学学术会议

作者： Wang Jianwei Du Yaping Frontier Institute of science and Technology Xi'an Jiaotong University school of Materials science and Engineering & National Institute for Advanced Materials Tianjin Key Lab for Rare Earth Materials and Applications Centre for Rare Earth and Inorganic Functional Materials Nankai University

Despite prominent research efforts in developing cathode materials for lithium-sulfur batteries, relatively little emphasis has been placed on constructing functional cathode architectures. Herein, ceria(CeO) hollow spheres are prepared to fabricate the inside and outside structures of cathodes. A sandwich-type sulfur cathode, namely, h-CeO/sulfur-x-CNT/h-CeO cathode, is designed and fabricated by a simple layer-by-layer process. Due to the unique structural and compositional features, the h-CeO/sulfur-0.8-CNT/h-CeO cathode delivers high specific capacity of 876, 761, and 644 mAh g at 1 C, 2 C and 5 C rate, and the capacity retentions are 85.7%, 87.8%, and 92.4%, respectively. During 100 test cycles, the material displays high Coulombic efficiencies(above 99%) after the first cycle. More importantly, the cathode with sulfur loading of 1.8 mg/cm also exhibits stable cycling life up to 500 cycles at 1 C with a capacity decay as low as 0.073% per cycle.

关键词： rare earth materials ceria hollow structure electrochemistry li-s battery

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Oxygen Vacancies on Layered Niobic Acid Weaken the Catalytic Conversion of Polysulfides in lithium sulfur battery

Oxygen Vacancies on Layered Niobic Acid Weaken the Catalytic...

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中国化学会第十届全国无机化学学术会议

作者： lingling Xu Yaping Du Frontier Institute of science and Technology Xi'an Jiaotong University school of Materials science and Engineering Nankai University

Oxygen vacancies are usually considered as beneficial in catalytic conversion of polysulfides in lithium-sulfur batteries. In this work, we demonstrated that the conversion of polysulfides was hindered by oxygen vacancies on ultrathin niobic acid. The inferior performance induced by the oxygen vacancy was mainly attributed to the decreased electric conductivity as well as the weakened adsorption of polysulfides on the catalyst surface. This work showed that the care should be taken when designing a new catalyst for the lithium-sulfur battery using defect-engineering strategy.

关键词： niobic acid oxygen vacancy electrochemistry catalytic conversion li-s battery

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