化学工程
双金属片
催化作用
钴
材料科学
分离器(采油)
镍
多孔性
硫黄
吸附
纳米晶
退火(玻璃)
比表面积
纳米技术
化学
复合材料
有机化学
物理
工程类
冶金
热力学
作者
Jing Xiong,Xinyun Liu,Peking Xia,Xiaomao Guo,Shengjun Lu,Hua Lee,Yufei Zhang,Xinlong Liu
标识
DOI:10.1016/j.jcis.2023.08.185
摘要
In this manuscript, nickel/cobalt bimetallic nanocrystals confining into three-dimensional interpenetrating dual-carbon conductive structure (NiCo@C/CNTs) were successfully manufactured by annealing its core-shell structure (Ni-ZIF-67@ZIF-8) precursor under the high temperature. The results presented that the bimetallic nickel and cobalt nanocrystals with superior catalytic activity could quickly convert solid Li2S/Li2S2 into soluble LiPSs and effectively decrease the energy barrier. While the hierarchical CNT-porous carbon dual frameworks can provide quick electron/ion transport because of their large specific surface area and the exposure of enough active sites. When used as the separator modifier for lithium sulfur batteries, the battery properties were significantly improved with high specific capacity, outstanding rate capability, and long-term cycle stability. Specifically, its initial specific capacity can achieve to 1038.51 mAh g−1 at 0.5C. At the high rate of 3C, it still delivers satisfactory discharge capacity of 555 mAhg−1 and the capacity decay rate is only 0.065% per cycle after 1000 cycles at 1C. Furthermore, even exposed to heavy sulfur loading (3.61 mg/cm2), they still maintain promising cycle stability. Therefore, such kinds of MOFs derivative with powerful chemical immobilization and catalytic conversion for polysulfides provides a novel guidance for the modification separator and the potential application in the field of high-performance Li-S batteries.
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