构建Co1-xS纳米颗粒嵌入N-Doped无形碳@石墨烯与增强的离子存储
Tongjun Li1,2,3,4, Xuanchen Chen2,3,5, Yudong Pang1
1School of Physics, Henan Normal University, 46 Jianshe Road, Xinxiang, 453007, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|December 6, 2023
概括
一种新方法可以创建嵌入N-化碳/石墨烯 (CSCG) 的硫化物纳米粒子,用于先进的离子电池. 这种材料具有出色的容量和循环寿命,克服了以前的硫化阳极的局限性.
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
- 纳米技术 纳米技术
背景情况:
- 硫化 (CoS) 是离子电池的一个有前途的阳极材料,因为它具有很高的理论容量.
- 然而,其实际应用受到低导电性,快速容量衰减和循环期间显著体积变化的阻碍.
研究的目的:
- 开发一种简单的大规模方法,用于制备嵌入N-化碳/石墨烯 (CSCG) 的硫化物纳米粒子.
- 为了评估CSCG作为离子电池的阳极材料的电化学性能.
主要方法:
- 采用一种简单且可扩展的合成方法,在N-doped碳/石墨烯矩阵中创建Co1-xS纳米粒子.
- 进行了电化学测试,包括循环性能和速率能力.
- 用密度函数理论 (DFT) 的计算来理解材料的特性.
主要成果:
- 在0.2°C的200个循环后,CSCG材料表现出高可逆放电容量937mAhg-1的高可逆放电容量.
- 在2.0C的高电流密度下,在500个循环后保持了596mAhg-1的容量.
- 增强的性能归因于减少体积变化,通过减少氧化石墨烯 (rGO) 防止聚合,以及由于联合空缺和N-doping增加的活性位点.
结论:
- 开发的CSCG材料为高性能离子电池阳极提供了有前途的解决方案.
- 结构工程战略有效地解决了传统硫化阳极的局限性.
- 这项工作提供了通过缺陷工程和 heteroatom doping 改进阳极材料的见解.
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