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使用金属Sn/N,B共碳矩阵的三相接口工程,以提高硫电池的反应动力学和循环稳定性

Gwan Hyeon Park¹, Sandya Rani Mangishetti¹, Won-Gwang Lim²

¹Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do, 37673, Republic of Korea.

Small (Weinheim an der Bergstrasse, Germany)

|June 27, 2025

概括

这项研究引入了一种用于硫电池的新型复合催化剂 (Sn@NBGNs-CNTs). 催化剂有效地抑制了聚硫化物穿,提高了电池的稳定性和性能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

硫 (Li-S) 电池表现出由聚硫化物溶解和沉积驱动的固体-液体-固体相位过渡.
抑制可溶性聚硫化物穿对于Li-S电池的性能至关重要,需要催化剂来增强吸附和转化.
三相接口对于促进催化剂,导电材料和电解质之间的反应至关重要.

研究的目的:

为了合成和描述硫电池的新型复合催化剂.
为了研究催化剂定聚硫化物和加速氧化还原动力学的能力.
用开发的催化剂来评估Li-S细胞的电化学性能和循环稳定性.

主要方法:

一种复合催化剂 (Sn@NBGNs-CNTs) 的合成,该催化剂包括金属锡微粒在和联合的石墨烯纳米片和碳纳米管上.
催化剂结构及其作为硫宿主作用的描述.
电化学测试,包括潜在静态间歇定位技术 (PITT) 来确定Li2S核化增长率和长期循环稳定性测试.

主要成果:

Sn@NBGNs-CNTs复合物有效地定聚硫化物并提供活性位点,加速氧化还原反应动力学.
在接口上促进电荷转移和聚硫化物运输导致Li2S核化增速常数增加.
电极表现出极好的循环稳定性,在1°C的350个循环后保持93%的容量,每次循环衰变率为0.003%.

结论:

开发的复合催化剂通过减轻聚硫化物穿,显著提高硫电池性能.
催化剂设计的三相接口促进了高效的电荷转移和离子传输.
这项工作为开发稳定和高性能硫电池提出了一个有前途的战略.

关键词:

存款方式存款方式存款方式 -硫电池的使用情况.金属性的 Sn Sn Sn Sn 核化-成长的增长.三相接口是三相接口.

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