多硫化物
电解质
锂硫电池
化学工程
阴极
碳化
电池(电)
流苏
锂(药物)
碳纤维
化学
材料科学
煅烧
无机化学
吸附
催化作用
复合材料
有机化学
电极
农学
物理化学
功率(物理)
内分泌学
工程类
物理
复合数
生物
医学
量子力学
扎梅斯
作者
Jihyeon Park,Seoyoung Yoon,Seoyeah Oh,Jiyoon Kim,Dong‐Jun Kim,Geonho Kim,Jiyeon Lee,Myeong Jun Song,Ilto Kim,Kwonnam Sohn,Jiwon Kim
标识
DOI:10.1016/j.jechem.2021.03.036
摘要
Porous carbon has been applied for lithium-sulfur battery cathodes, and carbonized metal–organic framework (MOF) is advantageous in tuning the morphology. Herein, we have systematically synthesized water-distorted MOF (WDM) derived porous carbon via controlling the proportion of both water in a mixed solvent (dimethylformamide and water) and ligand in MOF-5 precursors (metal and ligand), which is categorized by its morphology (i.e. Cracked stone (closed), Tassel (open) and Intermediate (semi-open)). For example, decrease in water and increase in ligand content induce Cracked stone WDMs which showed the highest specific surface area (2742–2990 m2/g) and pore volume (2.81–3.28 cm3/g) after carbonization. Morphological effect of carbonized WDMs (CWDMs) on battery performance was examined by introducing electrolytes with different sulfur reduction mechanisms (i.e. DOL/DME and ACN2LiTFSI-TTE): Closed framework effectively confines polysulfide, whereas open framework enhances electrolyte accessibility. The initial capacities of the batteries were in the following order: Cracked stone > Intermediate > Tassel for DOL/DME and Intermediate > Tassel > Cracked stone for ACN2LiTFSI-TTE. To note, Intermediate CWDM exhibited the highest initial capacity and retained capacity after 100 cycles (1398 and 747 mAh/g) in ACN2LiTFSI-TTE electrolyte having advantages from both open and closed frameworks. In sum, we could correlate cathode morphology (openness and pore structure) and electrolyte type (i.e. polysulfide solubility) with lithium-sulfur battery performance.
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