带有双碳涂层的三明治ReS2纳米电缆可提供高效的K+/Na+存储性能
Jun Xu1, Fang Cao1, Xiaoyuan Yang1
1School of Microelectronics, Hefei University of Technology, Hefei 230009, PR China.
Journal of colloid and interface science
|May 15, 2024
概括
新的CNT@ReS2@NC纳米电缆为离子电池 (PIB) 和离子电池 (SIB) 提供了更高的性能. 这些先进的阳极表现出卓越的循环稳定性和容量,为下一代储能解决方案铺平了道路.
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:
- 开发高性能阳极材料对于推进离子电池 (PIB) 和离子电池 (SIB) 是至关重要的.
- 现有的阳极材料往往由于循环稳定性不佳和容量有限而受到损害,这阻碍了它们的实际应用.
- 二硫化物 (ReS2) 由于其多层结构而具有前景,但需要有效修改以优化其电化学特性.
研究的目的:
- 合成和描述由几层ReS2纳米薄膜组成的新型纳米电缆,这些纳米薄膜涂有碳纳米管 (CNT) 和添加的无形碳 (NC).
- 为了评估这些CNT@ReS2@NC纳米电缆在PIB和SIB中作为阳极的电化学性能.
- 研究双碳修饰对ReS2的储存能力和结构完整性的协同效应.
主要方法:
- 通过多步骤过程合成CNT@ReS2@NC纳米电缆,其中包括ReS2纳米板形成和随后的CNT和NC涂层.
- 使用电子显微镜,X射线衍射和拉曼光谱等技术对合成材料进行表征.
- 用于PIB和SIB的半电池和全电池配置的纳米电缆作为阳极的电化学测试,包括静电循环和速率能力测试.
主要成果:
- CNT@ReS2@NC纳米电缆具有独特的结构,具有少数层 ReS2纳米薄膜 (层间距为 0.64 nm),有效地与 CNT 和一个 NC 层集成.
- 在PIB中实现了出色的电化学性能,其容量为125 mAh/g,在3500个循环中保持1 A/g的容量.
- 在SIB中也观察到异常性能,在5A/g的3000个循环中提供202mAh/g,一个全细胞在2C的1000个循环中表现出每周期0.019%的低容量衰变率.
结论:
- 双碳修饰 (CNTs和NC) 协同增强了ReS2基于PIB和SIB的阳极的电化学性能.
- CNT骨架提供结构支和导电性,而NC层提供活跃点并抑制聚硫化物穿.
- 开发的CNT@ReS2@NC纳米电缆代表了下一代和离子电池的有希望的高性能阳极材料.
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