无氧活性金属共价有机框架用于无树的金属电池
Wenliang Qin1, Diandian Han1, Xiaowei Zhang1
1Henan Key Laboratory of Functional Salt Materials, Center for Advanced Materials Research, Zhongyuan University of Technology, Henan, 450007, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|February 26, 2025
概括
研究人员开发了新的金属共价有机框架 (MCOFs),以防止金属电池 (LMBs) 中的树生长. 这些MCOF确保了统一的沉积,使电池性能更安全,更稳定.
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:
- 金属阳极为金属电池 (LMB) 提供高能量密度.
- 由于沉积不均和离子运输缓慢,树形成和不稳定的介面阻碍了实际的LMB应用.
- 开发先进的分离器对于稳定的LMB至关重要.
研究的目的:
- 引入氧化还原活性金属共价有机框架 (MCOF),其双活性中心作为LMB的功能分离器.
- 调查MCOFs促进同质核和增强离子传输的能力.
- 为了证明MCOFs在使无树的金属阳极成为可能方面的潜力.
主要方法:
- 合成的MCOFs与氧化还原活性diarylamine单位和三核铜集群.
- 为LMBs制造基于MCOF的分离器.
- 电化学表征包括Li核化屏障,Li对称细胞循环,以及使用LiFePO4阴极进行全细胞性能测试.
主要成果:
- MCOFs有效调节了Li+离子的微环境,确保了均的核和沉积.
- MCOF分离器具有较高的Li+转移数 (0.93) 和离子导电性 (2.01 mS cm-1).
- 对称细胞显示稳定的/剥离超过1600小时,和完整的细胞达到98%容量保留.
结论:
- 具有双活性中心的MCOF是无金金属阳极的有希望的功能分离器.
- 在MCOF中的协同效应增强了Li+运输和均沉积,这对于高性能LMB至关重要.
- 这项研究为开发下一代储能设备的先进分离器提供了一个新的战略.
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