Efficient Polysulfides Conversion Kinetics Enabled by Ni@CNF Interlayer for Lithium Sulfur Batteries

IF 0.5 Q4 CHEMISTRY, MULTIDISCIPLINARY

Eurasian Chemico-Technological Journal Pub Date : 2023-11-20 DOI:10.18321/ectj1517

I. Rakhimbek, N. Baikalov, A. Konarov, A. Mentbayeva, Y. Zhang, Z. Mansurov, M. Wakihara, Z. Bakenov

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Abstract

Recent advances in the development of lithium-sulfur batteries (Li-S) demonstrated their high effectiveness owing to their tremendous theoretical specific capacity and high theoretical gravimetrical energy. Nevertheless, the potential commercialization of Li-S is significantly held by the insulating nature of sulfur and complicated RedOx reactions during the electrochemical charge-discharge processes. This paper presents nickel nanoparticles embedded carbon nanofibers interlayer (Ni@CNF) between a cathode and a separator as an additional physical barrier against lithium polysulfides shuttle for their efficient conversion during the charge-discharge cycling. Furthermore, the interlayer provides an auxiliary electron pathway with subsequent lowering of the charge transfer resistance. The electrochemical analysis of a Li-S cell with the Ni@CNF interlayer demonstrated high initial discharge capacities of 1441.2 mAh g-1 and 1194.2 mAh g-1 at 0.1 and 1.0 C rates, respectively, with remarkable capacity retention of ~83% after 100 cycles. This study revealed the advantageous impact of Ni@CNF towards solving the major issues of lithium-sulfur batteries, i.e., sluggish kinetics and the shuttle effect.

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用于锂硫电池的 Ni@CNF 夹层可实现高效的多硫化物转化动力学

锂硫电池（Li-S）的理论比容量大，理论重力能量高，因此其开发工作取得了最新进展，显示出其高效性。然而，硫的绝缘性和电化学充放电过程中复杂的氧化还原反应严重阻碍了锂硫电池的商业化潜力。本文介绍了在阴极和分隔层之间嵌入碳纳米纤维夹层（Ni@CNF）的镍纳米粒子，该夹层是防止多硫化锂穿梭的额外物理屏障，可在充放电循环过程中实现锂的高效转化。此外，中间膜还提供了一条辅助电子通路，从而降低了电荷转移电阻。对带有 Ni@CNF 中间膜的锂-S 电池进行的电化学分析表明，在 0.1 和 1.0 C 速率下，初始放电容量分别为 1441.2 mAh g-1 和 1194.2 mAh g-1，100 个循环后容量保持率高达约 83%。这项研究揭示了 Ni@CNF 在解决锂硫电池的主要问题（即缓慢的动力学和穿梭效应）方面的优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Eurasian Chemico-Technological Journal CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.10

自引率

20.00%

发文量

审稿时长

20 weeks

期刊介绍： The journal is designed for publication of experimental and theoretical investigation results in the field of chemistry and chemical technology. Among priority fields that emphasized by chemical science are as follows: advanced materials and chemical technologies, current issues of organic synthesis and chemistry of natural compounds, physical chemistry, chemical physics, electro-photo-radiative-plasma chemistry, colloids, nanotechnologies, catalysis and surface-active materials, polymers, biochemistry.