在以Sn为基础的MOF阳极中,晶体转变为非晶体,具有长周期寿命,用于储存
Ruoyu Wang1, Yao Chen1, Zaozao Wu1
1Jiangxi Province Key Laboratory of Functional Organic Polymers, East China University of Technology, Nanchang 330013, China.
Dalton transactions (Cambridge, England : 2003)
|June 23, 2025
概括
开发了一种基于锡的新型金属有机框架 (MOF),用于先进的存储. 这种材料表现出了显著的稳定性和容量保留超过1000个周期,为提高电池性能铺平了道路.
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:
- 开发稳定和高容量的阳极材料对于下一代离子电池至关重要.
- 金属有机框架 (MOF) 提供可调节的结构和高表面积用于电化学能量存储.
- 锡基材料由于其高的理论容量,对存储具有前景,但通常会遇到体积扩张问题.
研究的目的:
- 为增强存储应用合成和表征一个基MOF (Sn(HHTP)).
- 在化/脱周期期间研究Sn (HHTP) 的结构转化和电化学性能.
- 为了评估Sn ((HHTP) 作为阳极材料的循环稳定性和容量保留.
主要方法:
- 使用锡节点和活性联结体 (2,3,6,7,10,11-hexahydroxytriphenylene) 的锡基MOF的合成.
- 电化学表征,包括在各种电流密度下进行充放电循环.
- 结构分析,观察循环过程中的晶体变异.
主要成果:
- 在充放电周期中,合成的Sn(HHTP) MOF从晶体转变为无形状态.
- 在MOF结构中的Sn-O协调键有效地适应化/脱过程中的体积变化.
- 实现了特殊的循环稳定性,可逆容量为239mAhg-1在1000个循环后2Ag-1时,比第11个循环增加了228%.
结论:
- 基于锡的MOF,Sn(HHTP) 显示出作为存储的稳定和高性能阳极材料的巨大潜力.
- 可逆的晶体变形转变机制有助于适应体积变化并暴露活性位点.
- 这项研究强调了MOF在设计高性能离子电池的先进电极材料中的实用性.
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