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电化学(中英文) ›› 2023, Vol. 29 ›› Issue (3): 2217002.  doi: 10.13208/j.electrochem.2217002

所属专题: “下一代二次电池”专题文章

• 论文 • 上一篇    下一篇

CoNi基双金属-有机骨架衍生碳复合材料多功能改性锂硫电池隔膜

王妍洁a, 程宏宇a, 侯冀岳a, 杨文豪a, 黄荣威a, 倪志聪a, 朱子翼a, 王颖a,b, 韦克毅c, 张义永a,*(), 李雪a,*()   

  1. a昆明理工大学冶金与能源工程学院,锂离子电池与材料制备技术国家地方联合工程实验室,云南省先进电池材料重点实验室,云南 昆明 650093
    b攀枝花大学智能制造学院,四川 攀枝花 617000
    c云南中研实业有限公司技术中心,云南 昆明 650231
  • 收稿日期:2022-07-20 修回日期:2022-08-01 接受日期:2022-10-25 出版日期:2023-03-28 发布日期:2022-10-31

CoNi-based Bimetal-organic Framework Derived Carbon Composites Multifunctionally Modified Separators for Lithium-Sulfur Batteries

Yan-Jie Wanga, Hong-Yu Chenga, Ji-Yue Houa, Wen-Hao Yanga, Rong-Wei Huanga, Zhi-Cong Nia, Zi-Yi Zhua, Ying Wanga,b, Ke-Yi Weic, Yi-Yong Zhanga,*(), Xue Lia,*()   

  1. aNational and Local Joint Engineering Laboratory for Lithium-Ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Battery Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
    bCollege of Intelligent Manufacture, PanZhihua University, Panzhihua 617000, China
    cYunnan ZhongYan Industry Co., Ltd. Technology Center, Kunming 650231
  • Received:2022-07-20 Revised:2022-08-01 Accepted:2022-10-25 Published:2023-03-28 Online:2022-10-31
  • Contact: *Yi-Yong Zhang, Tel: (86)18059238780; E-mail: zhangyiyong0918@qq.com; Xue Li, Tel: (86)18213586305, E-mail: 438616074@qq.com.
  • About author:First author contact:

    #These authors contributed equally to this work.

  • Supported by:
    Yunnan Fundamental Research Projects(Grant NO. 202001AU070079);Yunnan Fundamental Research Projects(202101BE070001-018);Yunnan Fundamental Research Projects(202101AT070214);Yunnan Fundamental Research Projects(202101AW070006);Yunnan ZhongYan Industry Co., Ltd. Science and Technology Project(2020GY03)

摘要:

严重的多硫化物穿梭效应和转化缓慢等问题导致锂硫电池容量迅速衰减,其大规模应用受限。本文将金属有机框架材料(MOF)衍生碳(Ni,Co)/C用于锂硫电池隔膜改性,很好地解决了上述问题。钴镍双金属的协同作用分别实现了大量又快速的化学固硫和抑硫的可逆性,显著提高了锂硫电池的循环稳定性和倍率性能。在1 C的电流密度下,(Ni,Co)/C改性隔膜电池的容量在第1次循环时可以达到1035.6 mAh·g-1,在500次循环后容量仍保持662.2 mAh·g-1,容量保持率为63.9%。此外,本工作克服了二元金属基MOF制备难的问题,使用简单快速的室温液相合成法制备了柱状镍钴二元MOF,该法有望实现MOF的宏观制备。

关键词: 锂硫电池, 隔膜改性, 双金属有机框架, 穿梭效应

Abstract:

The commercial application of lithium-sulfur batteries (LSB) is still limited by the irreversible capacity fading caused by the shuttle of lithium polysulfides (LIPS). To address this issue, a bimetal (nickel, cobalt)-organic framework (MOF) derived carbon, (Ni, Co)/C, was prepared to modify the separator. The multifunctionally modified separator effectively captures LIPS, ensuring the stability and reversibility of sulfur fixation, while providing catalytic activity and improving ionic conductivity. The cobalt metal has a larger coordination number, more pore structure distribution, larger specific surface area, more surface C=O, and smaller particle size to achieve a large and rapid chemical sulfur fixation. The high conductivity provided by nickel, and the catalytic activity and the ability to block LIPS shuttling enabled the reversibility of sulfur inhibition. The synergistic effect of cobalt-nickel bimetals significantly improves the cycling stability and rate capability of LSB. At a current density of 1 C, the capacity of the (Ni, Co)/C modified separator battery could reach 1035.6 mAh·g-1 in the first cycle, the capacity remained at 662.2 mAh·g-1 after 500 cycles, and the capacity retention rate was 63.9%.

Key words: Lithium-sulfur battery, Modified separator, Bimetal-organic framework derived carbon composites, Shuttle effect