以为基础的金属有机框架作为离子电池的新阴极,具有卓越的循环稳定性
Qing Yin1, Zhihao Song1, Shuhan Yang1
1Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, School of Materials and Physics, China University of Mining and Technology Xuzhou 221116 P. R. China Lyz2021@cumt.edu.cn wyds123456@outlook.com.
Chemical science
|June 2, 2023
概括
金属有机框架 (MOF) 现在被用作离子电池 (CIB) 的阴极. 这项研究引入了一种基于Ni的新型MOF,该MOF表现出卓越的稳定性和动力学,用于高性能储能.
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:
- 离子电池 (CIB) 提供高的理论能量密度和无岩的运行,使它们成为大规模储能的有希望的电池.
- 目前的CIB开发受到慢速离子扩散和阴极材料不稳定性的阻碍,导致容量衰减和速度性能差.
- 金属有机框架 (MOF) 具有适合离子容纳的调节结构,但它们在离子型电池中的使用尚未探索.
研究的目的:
- 研究金属有机框架 (MOF) 作为高性能离子电池 (CIB) 的阴极材料的潜力.
- 为了证明一种新的基于Ni的MOF,Ni (dpip),作为CIB的有效阴极.
- 分析对基于MOF的CIB阴极性能有助于提高结构和电化学性能.
主要方法:
- 一种基于Ni的新型金属有机框架 (MOF),Ni(dpip的合成和特征,具有双大小的管状通道.
- 在离子电池 (CIB) 配置中,作为阴极材料的Ni (dpip) 的电化学测试.
- 在充放电周期期间分析离子扩散动力学和结构稳定性.
主要成果:
- 在CIB中,Ni (dpip) MOF表现出稳定的可逆容量为155mA hg-1 .
- 观察到异常的循环稳定性,其低容量衰变率为每周期0.026%,超过500个循环.
- 获得了优异的离子动力学,平均扩散系数为10-10 cm s-1 .
结论:
- 本研究介绍了MOF基材料作为高性能CIB的阴极的首次成功应用.
- (dpip) 阴极的性能归因于协同的氧化还原活性,独特的双通道结构和低扩散障碍.
- 这项工作为利用MOFs在基于离子的能量存储系统中开辟了新的途径.
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