集成的梯度Cu电流采集器使金属阳极的自下而上的增长成为可能:接口结构的作用
Yuhang Liu1, Yifan Li1, Zhuzhu Du1
1Frontiers Science Center for Flexible Electronics and Shaanxi Institute of Flexible Electronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|June 13, 2023
概括
优化3D铜电流采集器与 CuO 纳米线的接口,促进了稳定的金属阳极沉积. 这一突破提高了离子电池循环稳定性和寿命.
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:
- 3D铜电流收集器增强了金属阳极循环稳定性.
- 接口结构在沉积模式中的作用需要进一步调查.
- 控制沉积对于防止树岩的形成和提高电池性能至关重要.
研究的目的:
- 通过使用基于3D梯度Cu的电流采集器,研究接口结构对沉积模式的影响.
- 在Cu薄膜上制造和特征CuO纳米线阵列 (CuO@Cu) 具有可调节的接口结构.
- 为了优化当前收集器设计,以提高金属阳极性能.
主要方法:
- 在Cu薄膜上通过CuO纳米线阵列的电化学增长制造3D集成梯度Cu基电流采集器.
- 通过控制CuO纳米线阵列的分散性来调节接口结构.
- 金属阳极和全电池 (使用LiFePO4阴极) 的电化学测试.
主要成果:
- 稀疏而密集的CuO纳米线阵列导致不利的核和快速的树生长.
- CuO纳米线阵列的均和适当的分散使得稳定的底部核和平稳的横向沉积成为可能,从而实现了自下而上的增长.
- 优化的CuO@Cu-Li电极显示出高的库伦比效率 (在150个循环后≈99%) 和长寿命 (>1200小时).
- 带有LiFePO4阴极的全电池显示出出色的循环稳定性和速率能力.
结论:
- 在3D铜电流收集器上CuO纳米线阵列的分散性极大地影响了沉积行为.
- 均分散的CuO纳米线促进了理想的自下而上的金属生长,提高了阳极的稳定性和性能.
- 这项研究为设计电池中的高性能金属阳极的梯度Cu电流采集器提供了见解.
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