调节界面离子迁移,在层层地相互嵌入的MoS2/Ti3C2中具有支柱作用,用于高性能离子电池
Feier Niu1, Yueyuan Mao2, Nana Wang3
1College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu 233000, PR China; Anhui Province Quartz Sand Purification and Photovoltaic Glass Engineering Research Center, Bengbu 233000, PR China.
Journal of colloid and interface science
|November 17, 2023
概括
这项研究引入了一种新的层层相互嵌入的结构 (L-MoS2/Ti3C2),用于增强离子存储. 该材料在柔性电池中表现出卓越的动力学和稳定性.
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
- 纳米技术纳米技术
背景情况:
- 由于其可适应的结构,二维 (2D) 层级材料提供了离子储存的潜力.
- 然而,由于强烈的静电相互作用和高能障碍,Zn离子扩散动力学缓慢,阻碍了它们的实际应用.
研究的目的:
- 为高性能离子电池开发一种具有改进的Zn离子扩散动力学的新材料.
- 研究新材料的结构和电化学特性.
主要方法:
- 在MoS2间层中使用Ti3C2MXene组装一个层层地相互嵌入的结构 (L-MoS2/Ti3C2).
- 密度函数理论 (DFT) 计算和静电间歇定位技术 (GITT) 用于动力分析.
- 电化学性能测试,包括循环稳定性和速率能力,在灵活的半固态水性离子电池中.
主要成果:
- L-MoS2/Ti3C2结构为Zn离子提供了高效的扩散通道,显著提高了迁移动力学.
- 实现了卓越的长期循环稳定性 (75.6%的保持率在 7000 个循环后在 15 A g-1) 和高速率能力 (107 mAh g-1在 20 A g-1).
- 在极端曲条件下,在柔性电池中表现出强大的性能 (在2.0 A g-1在180°曲时4000次循环后保持80.5%).
结论:
- 这种L-MoS2/Ti3C2复合材料有效地克服了Zn离子存储的传统二维材料的局限性.
- 这种工程结构显示出开发高性能,稳定和灵活的储能设备的巨大前景.
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