一种具有双功能的富硫共聚物,用于稳定的定和在硫电池中增强聚硫化物的转化
Yao Fu1, Yang Jin1, Fang-Fei Guo1
1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|December 23, 2024
概括
这项研究引入了一种用于硫电池的新型富硫共聚合物阴极材料 (FSP). FSP材料表现出增强的导电性和抑制的穿效应,导致高容量和稳定性,即使在苛刻的条件下.
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:
- 富含硫的共聚合物对-硫 (Li-S) 电池具有吸引力,因为其成本低,硫分散均.
- 电导率差以及聚硫化物的穿效应限制了Li-S电池的性能,尤其是在高硫负载和低电解质/硫比下.
- 在实际操作条件下,现有的材料在与快速容量衰变和低硫利用作斗争.
研究的目的:
- 为了合成和表征一种新的Fe1-xS/C分散和含有Se的富硫共聚合物 (FSP) 用于Li-S电池.
- 为应对富含硫的正极材料中导电性差和聚硫化物穿效应的挑战.
- 在高硫负载和低电解质/硫比下评估FSP阴极的电化学性能.
主要方法:
- 使用铁素,三酸和SexSy来创建FSP材料,采用了一种单合成方法.
- 该FSP材料在含有Se的富含硫的共聚合物矩阵中包含高度分散的Fe1-xS/C纳米粒子.
- 在各种条件下 (例如,高硫负载,低E/S比率) 评估了电化学性能,包括容量保留和循环稳定性.
主要成果:
- 合成的FSP材料表现出硫的共价化学结合,有效地抑制了聚硫化物穿效应.
- 加入 (Se) 增强了FSP的电导率和反应动力学.
- Fe1-x/S/C纳米粒子催化了聚硫化物转化,并进一步抑制了穿效应,从而提高了性能.
结论:
- 优化的FSP电极在0.2°C时实现了1330mAh-1的高特异容量.
- 即使在高硫负载 (4.08 mg cm-2) 和低电解质/硫比 (6 μL mg-1) 下,在0.2°C下也显示出734.7 mAh g-1的显著容量.
- FSP材料为开发高性能和稳定的硫电池提供了有前途的解决方案.
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