在Fe-Doped Co3O4中促进离子扩散,以实现高速性能
Yonghuan Fu1, Guowei Sun2, Rene Lucka3
1Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693, Ilmenau, Germany.
Small (Weinheim an der Bergstrasse, Germany)
|February 28, 2025
概括
铁兴奋剂增强了氧化物纳米粒子用于离子电池阳极. 这一策略提高了导电性和离子传输,从而使离子电池具有优越的速率能力和稳定的循环性能.
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
- 纳米技术 纳米技术
背景情况:
- 氧化物 (Co3O4) 是离子电池 (SIB) 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,低导电性和低速率性能阻碍了SIB中Co3O4的实际应用.
研究的目的:
- 为了提高SIBs的Co3O4阳极的电化学性能.
- 研究铁 (Fe) 兴奋剂对Co3O4纳米粒子结构和特性的影响.
主要方法:
- 联合沉的兴奋剂策略是合成铁兴奋的Co3O4纳米颗粒 (FexCo3-xO4NP).
- 实验性表征和理论计算以确认Fe的注点,并分析结构变化.
- 在SIB中作为阳极的FexCo3-xO4NP的电化学测试,包括速率能力和循环稳定性测试.
- 使用FexCo3-xO4 NPs组装和测试一个Na-ion全电池.
主要成果:
- 证实了在Co3O4的旋转结构内的八面体位点的Fe兴奋剂.
- 铁兴奋剂导致带隙减少和离子输送间距扩大,促进电子和Na-ion输送.
- 在FexCo3-xO4NP展示了令人印象深刻的速度能力402.9mAhg-1在3Ag-1.1.
- 实现了显著的循环稳定性,在500个循环后保持786.2 mAh g-1在0.5 A g-1下,没有容量色.
- 一个Na-ion全电池表现出105mAhg-1的放电容量,循环稳定.
结论:
- 铁是提高SIBs Co3O4阳极的速度性能和循环稳定性的关键因素.
- 性能提升归因于铁 doping 促进的电子和离子运输的改善.
- 这项研究为设计高速率电极提供了宝贵的见解,并为先进的阳极提出了有希望的方法.
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