Mesoporous carbon spheres with controlled porosity for high-performance lithium–sulfur batteries
Mesoporous carbon spheres with controlled porosity for high-performance lithium–sulfur batteries
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用于高性能锂硫电池的孔隙率可控的介孔碳球
DOI：
10.1016/j.jpowsour.2015.03.135
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发表时间：
2015-07
影响因子：
9.2
通讯作者：
Xiu Song Zhao
中科院分区：
文献类型：
--
作者：
Yiqian Wang;Peizhi Guo;Jingquan Liu;Xiu Song Zhao
以海藻酸钠为碳前驱体，硅胶颗粒为硬模板，采用喷雾干燥辅助模板法制备了具有分级孔结构、可控孔容和高比表面积的中孔碳球。所得的MC球，具有在3-30 nm范围内的分级孔，被用作用于制备锂-硫电池的阴极材料的导电基质。利用高压诱导的一步浸渍法将元素硫浸渍到MC球的孔中。研究了由不同孔容和比表面积的MC微球（S-MC-X-60）制备的硫浸渍MC微球（S-MC-X-60）的电化学性能。S-MC-4-60复合正极材料在0.2C下循环100次后，表现出1388 mAhg-1的高初始放电容量和857 mAhg-1的良好循环稳定性，并且还表现出2C下864 mAhg-1的优异倍率性能。更重要的是，MC-4球中的硫负载含量可高达80%，在0.2C下循环100次后仍能提供569 mAhg− 1的容量。
Mesoporous carbon (MC) spheres with hierarchical pores, controlled pore volume and high specific surface areas have been prepared by a mass-producible spray drying assisted template method using sodium alginate as carbon precursor and commercial colloidal silica particles as hard template. The resulting MC spheres, possessing hierarchical pores in the range of 3–30 nm, are employed as conductive matrices for the preparation of cathode materials for lithium–sulfur batteries. A high pressure induced one-step impregnation of elemental sulfur into the pore of the MC spheres has been exploited. The electrochemical performances of sulfur-impregnated MC spheres (S-MC) derived from MC spheres with different pore volume and specific surface area but with the same sulfur loading ratio of 60 wt% (S-MC-X-60) have been investigated in details. The S-MC-4-60 composite cathode material displayed a high initial discharge capacity of 1388 mAhg−1and a good cycling stability of 857 mAhg−1after 100 cycles at 0.2C, and shows also excellent rate capability of 864 mAhg−1at 2C. More importantly, the sulfur loading content in MC-4 spheres can reach as high as 80%, and it still can deliver a capacity of 569 mAhg−1after 100 cycles at 0.2C.
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作者：
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