Dual-Confined and Hierarchical-Porous Graphene/C/SiO2 Hollow Microspheres through Spray Drying Approach for Lithium-Sulfur Batteries
Dual-Confined and Hierarchical-Porous Graphene/C/SiO2 Hollow Microspheres through Spray Drying Approach for Lithium-Sulfur Batteries
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喷雾干燥法制备双限域多级多孔石墨烯/C/SiO2空心微球用于锂硫电池
DOI：
10.1016/j.electacta.2017.09.140
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发表时间：
2017-11-20
影响因子：
6.6
通讯作者：
Chen, Xiaohua
中科院分区：
文献类型：
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作者：
Wu, Huali;Tang, Qunli;Chen, Xiaohua
设计了合理的、坚固的分级多孔石墨烯/C/SiO2中空微球（G/C/SiO2）作为硫负载的支架。将硫浸渍到微球中以制备用于Li-S电池的硫-石墨烯/C/ SiO2复合材料（S-G/C/SiO2）。三维多孔微球由SiO2纳米颗粒通过石墨烯和碳层相互连接而成，能够为硫在充放电过程中的体积变化留出足够的空间，并通过物理吸附和化学结合的方式将多硫化物囚禁起来，从而有效提高循环稳定性。结果表明，S-G/C/SiO2复合材料具有较好的力学性能和力学性能。SiO_2含量为0.1%时放电容量高达1118.4mA·h·g ~（-1），5C时倍率性能为551.7mA·h·g ~（-1），0.5C下400次循环后的激发循环性能为626.3mA·h·g ~（-1（每循环仅0.062%的超低容量衰减），被认为是用于Li-S电池的有前景的阴极材料。(C)2017爱思唯尔有限公司版权所有
Rational robust hierarchical-porous Graphene/C/SiO2 hollow microspheres (G/C/SiO2) were designed as scaffold to load sulfur. The sulfur was impregnated into the microspheres to generate sulfur-Graphene/C/ SiO2 composites (S-G/C/SiO2) for Li-S batteries. The 3D porous microspheres consist of SiO2 nanoparticles connected by interconnected graphene and carbon layer, which could leave enough room for volume changes of sulfur during the charge-discharge process, and imprison the polysulfide via physical adsorption and chemical binding, thus effectively improving the cycle stability. As a result, the S-G/C/SiO2 with 20.1 wt. % SiO2 exhibits high discharge capacities up to 1118.4 mA h g(-1) at 0.1C, an excellent rate capability of 551.7 mA h g(-1) at 5C, and an exciting cycle performance of 626.3 mA h g(-1) after 400 cycles at 0.5C (ultralow capacity decay of only 0.062% per cycle), represented to be a promising cathode material for Li-S batteries. (C) 2017 Elsevier Ltd. All rights reserved.