旋转极化表面电容效应使Fe3 O4 极高端宽操作-温度储存
Zhenwei Li1,2, Meisheng Han3, Peilun Yu1
1Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Shenzhen Engineering Lab for Supercapacitor Materials, School of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, University Town, Shenzhen, 518055, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 7, 2023
概括
铁氧化物 (Fe3O4) 纳米粒子被封装在碳中并分散在石墨烯上,作为离子电池 (SIB) 的高性能阳极. 这种材料在广泛的温度范围内表现出极好的电化学性能,从-40°C到60°C.
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:
- 氧化铁 (Fe3O4) 是环境离子电池 (SIB) 的一个有前途的阳极材料.
- 关于Fe3O4阳极在广泛的操作温度范围内电化学性能的研究有限.
- 了解温度依赖的行为对于实际的SIB应用至关重要.
研究的目的:
- 在广泛的工作温度 (-40至60°C) 下,研究基于Fe3O4的新阳极材料用于SIB的电化学特性.
- 探索石墨烯和碳封装在提高阳极性能方面的作用.
- 阐明在不同温度下改善离子储存背后的机制.
主要方法:
- 合成Fe3O4纳米粒子被碳纳米层封装并分散在石墨烯 (Fe3O4/C@G) 上.
- 在温度范围为-40至60°C的半个和全个SIB电池中的Fe3O4/C@G阳极的电化学表征.
- 使用先进技术分析材料结构和纳米粒子大小.
主要成果:
- Fe3O4/C@G阳极表现出高容量和出色的快速充电能力.
- 该材料在广泛的操作温度范围内表现出了显著的循环稳定性.
- 超小的超偏磁铁纳米粒子 (≈2 nm) 诱导了自旋极化表面电容效应,增强了Na-离子的运输和储存.
结论:
- Fe3O4是适用于在广泛温度条件下工作的离子电池的可行阳极材料.
- 石墨烯和碳封装显著改善Fe3O4纳米粒子尺寸和电极导电性.
- 旋转极化表面电容效应是实现高性能在宽温度SIBs的关键.
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