聚氨酸修饰的层次框架接口层为 Zn 阳极提供高度稳定的微结晶表面.
Qi Wang1,2, Lei Han1,2,3, Rui Pang1
1Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, P. R. China.
ACS nano
|June 20, 2025
概括
一个新的聚基甲 (POF-S) 接口层有效地抑制了水性Zn离子电池中的树的生长. 这项创新提高了阳极的稳定性和循环寿命,为更安全,更高效的电池铺平了道路.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性Zn离子电池提供低成本和高安全性,但受到Zn树突增长和低库伦比效率的影响.
- 这些问题阻碍了有前途的离子电池技术的商业化.
研究的目的:
- 为Zn阳极开发一个多功能接口层,以克服树突形成并提高接口稳定性.
- 为了研究一个聚基甲 (POF-S) 改性碳纳米管海绵作为一个Zn阳极接口层的有效性.
主要方法:
- 碳纳米管海绵的表面修饰用聚基甲 (POF-S).
- 理论计算和POF-S特性和性能的实验验证.
- 在水性电解质和全细胞中对修改后的 Zn 阳极进行电化学测试.
主要成果:
- POF-S表现出层次性毛孔和Zn亲和中心,有效地抑制了树的生长和副作用.
- 接口层促进了密集的,微结晶的 Zn 沉积 (Zn(002) + Zn(101)).
- 经过修改的 Zn 阳极在 1 mA cm-2/1 mAh cm-2 时实现了 5000 h 的循环寿命,并在更高的电流和深度下保持稳定性.
结论:
- POF-S接口层显著提高了水性Zn离子电池中Zn阳极的稳定性和寿命.
- 开发的战略为商业化高性能和安全的水性离子电池提供了可行的解决方案.
- POF-S@Zn//MnO2全细胞表现出极好的循环稳定性,在2 A g-1的2200个循环后保持超过120mAhg-1的稳定性.
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