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铜合金属有机框架-74 固态电解质用于高性能全固态金属电池

Hao Zhang¹, Zhiyuan Zhou¹, Xinyao Sun¹

¹College of Chemical Engineering, Inner Mongolia University of Technology, & Engineering Research Center of Large Energy Storage Technology Ministry of Education, Hohhot 010051, China.

Journal of colloid and interface science

|March 13, 2025

概括

研究人员开发了一种新的双金属金属有机框架 (MOF),Cu2Mg8-MOF-74,以增强可充电金属电池固态电解质中的离子 (Na+) 运输,提高导电性和稳定性.

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
储能储能储能储能储能储能

背景情况:

可充电的固体金属电池具有高能量密度,但由于Na+运输不佳和寿命有限而受到损害.
金属有机框架 (MOFs),如Mg-MOF-74,由于它们的多孔结构,显示出作为固态电解质的希望,但原始版本具有较低的Na+导电性.
在Mg-MOF-74中缓慢的离子运动限制了其作为电池固态电解质的有效性.

研究的目的:

为了增强金属电池固态电解质中的Na+运输动力学和电化学稳定性.
开发和研究双金属MOF作为改进的固态电解质.
为了克服原始Mg-MOF-74在固体电池应用中的局限性.

主要方法:

一系列双金属MOFs的合成,特别是Cu2Mg8-MOF-74,通过用铜合Mg-MOF-74.
合成的MOF电解质的Na+运输特性和电化学稳定性的表征.
密度函数理论 (DFT) 的计算,以了解离子定机制.
制造和测试Na3V2(PO4)3的电池电池Cu2Mg8-MOF-74的电池电池.

主要成果:

与原始的Mg-MOF-74相比,双金属Cu2Mg8-MOF-74电解质显著改善了Na+运输.
由于双金属位点,Cu2Mg8-MOF-74表现出增强的离子 (ClO4-) 定能力,这是DFT证实的.
在室温下达到3.18 × 10^-3 S cm^-1的离子导电率和0.86的Na+转移数.
Na3V2(PO4)3水Cu2Mg8-MOF-74水Na电池在1°C下提供了104.5mAhg-1的高特异容量,容量保留率为91%.

结论:

开发的双金属Cu2Mg8-MOF-74是可充电金属电池的高效固态电解质.
用铜合Mg-MOF-74成功增强了Na+导电性和电化学稳定性.
这项研究提出了一个可行的战略,用于优化MOF材料,用于先进的电池应用.

关键词:

所有固态金属电池都是固态金属电池.配备了 Cu-doped 的 Mg-MOF-74 合剂.金属有机框架的框架.导电性为Na(+) 的导电性.固态电解质固态电解质

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