Solvent-engineered ZIF-67-derived cobalt-embedded carbon as polysulfide trapping host for high-stability Li–S battery

IF 2.4 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ionics Pub Date : 2024-09-16 DOI:10.1007/s11581-024-05808-7
Suresh Archana, Perumal Elumalai
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引用次数: 0

Abstract

A metal organic framework (MOF)–derived cobalt-embedded nitrogen-doped carbon/sulfur composites (Co-NCS) from ZIF-67 template was generated and tested for lithium-sulfur (Li–S) battery. Solvent-engineered tunable morphology of ZIF-67 and its influences on lithium storage in Li–S battery were examined. A coin-type cell was employed for Li–S system having different Co-NCS composites cathode and lithium metal anode and its electrochemical performances were compared. The dodecahedron-shaped Co-NCS composite synthesized using water solvent (Co-NCS-W) showed superior performance with discharge capacity of 1000 mAh g−1 at 0.02C-rate. This battery showed excellent cycle-life stability for about 500 charge/discharge cycles sustaining a 480 mAh g−1 steady capacity at high C-rate of 0.1C. The superior performance was attributed to structural stability obtained through MOF synthesis route and presence of carbon matrix that served as a conducting network for charge transport as well as providing adequate room for sulfur cathode. The Co-NCS-W composite with Co–N sites leads to improved polysulfide trapping, resulting in excellent cycling stability. A significant amount of capacitive storage along with diffusive Li+ storage in all cathode hosts generated resulted in high-rate capability. The cathode demonstrated good capacity and superior rate capability, along with excellent cycle-life stability, making it ideal for high-performing Li–S batteries.

Graphical abstract

Abstract Image

溶剂工程 ZIF-67 衍生的嵌钴碳作为高稳定性锂-S 电池的多硫化物捕集宿主
利用 ZIF-67 模板生成了一种金属有机框架(MOF)衍生的钴嵌入氮掺杂碳/硫复合材料(Co-NCS),并对其进行了锂硫(Li-S)电池测试。研究了 ZIF-67 的溶剂工程可调形貌及其对锂-硫电池中锂储存的影响。采用不同的 Co-NCS 复合材料阴极和锂金属阳极制作了锂-S 系统的纽扣式电池,并比较了其电化学性能。使用水溶剂合成的十二面体形 Co-NCS 复合材料(Co-NCS-W)性能优越,在 0.02C 速率下的放电容量为 1000 mAh g-1。这种电池显示出卓越的循环寿命稳定性,在 0.1C 的高 C 速率下,可在约 500 次充放电循环中保持 480 mAh g-1 的稳定容量。优异的性能归功于通过 MOF 合成路线获得的结构稳定性以及碳基质的存在,碳基质可作为电荷传输的导电网络,并为硫阴极提供足够的空间。带有 Co-N 位点的 Co-NCS-W 复合材料改善了多硫化物的捕获,从而实现了出色的循环稳定性。在所有阴极主体内都产生了大量的电容存储和扩散式 Li+ 存储,从而实现了高倍率能力。该阴极表现出良好的容量和卓越的速率能力,以及出色的循环寿命稳定性,使其成为高性能锂-S 电池的理想选择。
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来源期刊
Ionics
Ionics 化学-电化学
CiteScore
5.30
自引率
7.10%
发文量
427
审稿时长
2.2 months
期刊介绍: Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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