MOF-Derived Bimetal ZnPd Alloy as a Separator Coating with Fast Catalysis of Lithium Polysulfides for Li–S Batteries
MOF-Derived Bimetal ZnPd Alloy as a Separator Coating with Fast Catalysis of Lithium Polysulfides for Li–S Batteries
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DOI：
10.1021/acsaem.1c02797
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发表时间：
2021-11
影响因子：
6.4
通讯作者：
Hong-Jie Zhou;Xue-Liang Zhang;Min-Yi Zou;Song-Ting Gu;Yuepeng Cai;Xu-Jia Hong
中科院分区：
文献类型：
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作者：
Hong-Jie Zhou;Xue-Liang Zhang;Min-Yi Zou;Song-Ting Gu;Yuepeng Cai;Xu-Jia Hong
锂硫电池具有较高的理论比容量（1675 mAh/g），但多硫化锂的穿梭效应极大地阻碍了其应用。本文制备了均匀分散在氮掺杂三维碳骨架（ZnPd/NCF）中的金属有机骨架（MOF）衍生的ZnPd合金纳米颗粒，并将其用作长循环稳定锂硫电池的隔膜涂层。亲锂元素Zn和亲硫元素Pd的协同效应赋予ZnPd合金对多硫化锂的高催化活性，使得ZnPd/NCF能够在高硫负载量或电流密度下快速吸附和催化多硫化锂。结果，具有ZnPd/NCF涂覆的隔膜的Li-S电池在1C和1.2mg/cm 2硫负载下显示出916 mAh/g的初始容量，在500次循环后保持627 mAh/g的电池比容量。同时，即使在6 mg/cm 2的硫负载下，也实现了1009 mAh/g（5.45 mAh/cm 2）的比容量。
Lithium–sulfur battery has a high theoretical specific capacity (1675 mAh/g), but its application is greatly hindered by the lithium polysulfide shuttling effect. In this paper, metal–organic framework (MOF)-derived ZnPd alloy nanoparticles with uniform dispersion in a nitrogen-doped three-dimensional carbon framework (ZnPd/NCF) were prepared and used as a separator coating for developing long-cycle stable lithium–sulfur batteries. The synergistic effect of lithium philophile element Zn and sulfur philophile element Pd endows the ZnPd alloy with high catalytic activity for lithium polysulfides, enabling ZnPd/NCF to rapidly adsorb and catalyze lithium polysulfides at high sulfur loadings or current densities. As a result, the Li–S cell with the ZnPd/NCF-coated separator shows an initial capacity of 916 mAh/g at 1C and 1.2 mg/cm2sulfur loading, with the specific battery capacity of 627 mAh/g being retained after 500 cycles. Meanwhile, a specific capacity of 1009 mAh/g (5.45 mAh/cm2) was achieved even at 6 mg/cm2sulfur loading.