金属有机框架衍生NiS2/C空心结构,用于硫电池中增强的多硫化物氧化还原动力学
Jiaming Cao1, Muhammad Usman1, Pengfei Jia1
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
The Journal of chemical physics
|January 5, 2024
概括
研究人员开发了一种新的NiS2/碳复合物,以解决聚硫化物在硫电池中的穿问题. 这种材料增强了聚硫化物转换动力学,显著提高了电池容量和稳定性.
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) 电池面临着可溶性多硫化物转运带来的挑战,导致容量下降.
- 目前的封闭策略,如多孔碳,提供有限的解决方案,由于缓慢的聚硫化物转化动力学.
研究的目的:
- 设计一种新的阴极材料,减轻聚硫化物穿,提高Li-S电池的转换动力学.
- 开发一种使用金属有机框架的NiS2/碳复合材料,以提高Li-S电池的性能.
主要方法:
- 在Ni-金属-有机框架的微型空洞结构上嵌入碳层的NiS2纳米颗粒的合成.
- 制造NiS2/碳@硫 (NiS2/C@S) 复合电极. 复合电极的制造.
- 电化学测试用于评估容量,库伦比效率,速率性能和循环稳定性.
主要成果:
- NiS2/C复合物有效地捕获硫种并影响氧化还原转化动力学.
- NiS2/C@S 阴极表现出抑制的穿效应,高库伦比效率和良好的速率性能.
- 在1°C时达到900mAhg-1的初始容量,在500个周期内每周期降低0.132%的低容量下降率.
结论:
- NiS2/C复合材料为Li-S电池中硫阴极的合理设计提供了一个有前途的策略.
- 改进的反应动力学和抑制的穿效应有助于提高电池的寿命和性能.
- 这种方法为克服当前Li-S电池技术的关键局限性提供了一条途径.
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