ZIF-67 on Sulfur-Functionalized Graphene Oxide for Lithium–Sulfur Batteries,Inorganic Chemistry

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ZIF-67 on Sulfur-Functionalized Graphene Oxide for Lithium–Sulfur Batteries
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2023-02-08 , DOI: 10.1021/acs.inorgchem.2c03998
Mingqi Xu _{1,

2} , Tong Wang ₁ , Haijun Wang ₃ , Yunliang Wang ₂ , Shuxian Li ₂ , Jingwen Sun ₃ , Jingquan Sha ₁

Affiliation

How to overcome the problem of fast capacity fading and low sulfur utilization is the key to promote the practical applications of lithium–sulfur (Li–S) batteries. Based on the fact that sulfur-functionalized graphene oxide (GO-S) can avoid the loss of sulfur/polysulfides through the strong C–S interaction, and the zeolitic imidazolate framework (ZIF-67) can capture sulfur and catalyze lithium polysulfide (Li₂S_x, 4 ≤ x ≤ 8), the combination of ZIF-S (ZIF-67 after combining with sulfur) with GO-S can be expected to be an excellent electrode material for Li–S batteries due to the synergistic effect. Herein, ZIF-S@GO-S (n) nanocomposites (n = 1, 2, and 3 for the mass ratio of ZIF-67/GO of 4:1, 6:1, and 8:1, respectively) as the cathode materials in Li–S batteries were successfully fabricated, and ZIF-S@GO-S (2) showed better electrochemical performances and cycle stability with a high specific capacity of 1529.5 mA h g^–1 at the initial cycle and 792 mA h g^–1 after 500 cycles at 0.1 C (1 C = 1675 mA h g^–1). The fact that ZIF-S@GO-S (n) can simultaneously improve the conductivity and utilization of S (C–S···S₈ and C–S···S_xLi₂) and the conversion kinetics of Li₂S_x (4 ≤ x ≤ 8) provides a new avenue for designing and fabricating promising cathodes for high-performance Li–S batteries.

中文翻译：

ZIF-67 用于锂硫电池的硫功能化氧化石墨烯

如何克服容量衰减快和硫利用率低的问题是推动锂硫（Li-S）电池实际应用的关键。基于硫功能化氧化石墨烯（GO-S）可以通过强C-S相互作用避免硫/多硫化物的损失，沸石咪唑骨架（ZIF-67）可以捕获硫并催化多硫化锂（Li ₂ S _x , 4 ≤ x ≤ 8)，ZIF-S（与硫结合后的 ZIF-67）与 GO-S 的组合由于协同效应有望成为 Li-S 电池的优良电极材料。在此，ZIF-S@GO-S ( n ) 纳米复合材料 ( n= 1、2 和 3，ZIF-67/GO 的质量比分别为 4:1、6:1 和 8:1）作为 Li-S 电池的正极材料，成功制备了 ZIF-S @GO-S (2) 表现出更好的电化学性能和循环稳定性，在初始循环时具有 1529.5 mA hg ^–1的高比容量，在0.1 C 下循环 500 次后为 792 mA hg ^{–1 （1 C = 1675 mA hg}^–1 ). ZIF-S@GO-S ( n ) 可以同时提高S（C–S···S ₈和C–S···S _x Li _{2 ）的电导率和利用率以及Li}₂的转化动力学S _x (4 ≤ x≤ 8) 为设计和制造高性能锂硫电池正极提供了新途径。

更新日期：2023-02-08

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