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层状固体布伦斯特酸用于动态界面pH调节,以实现耐用的阳极
Caofeng Niu1, Bing Xu1, Jiachen Tian1
1School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China. chenjingwei@ouc.edu.cn.
Materials horizons
|August 6, 2025
概括
研究人员开发了一种分层材料,HNbMoO6·H2O (HNM),通过控制阳极的pH来稳定水性离子电池 (AZIB). 这防止了树的生长,并改善了电池的性能和寿命.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性离子电池 (AZIB) 提供安全,低成本的电网存储,但在阳极处遭受演变反应 (HER).
- HER导致不稳定的界面pH值,副产品的形成和树突的生长,限制了AZIB的性能.
研究的目的:
- 在AZIB中开发用于界面pH调节和阳极保护的材料.
- 抑制HER和树突形成,以提高电池的稳定性和寿命.
主要方法:
- 分层固体布伦斯特德酸HNbMoO6·H2O (HNM) 的合成.
- 密度函数理论 (DFT) 计算以调查离子吸附和界面相互作用.
- 在对称和不对称的AZIB和全细胞中对HNM修饰的阳极进行电化学测试.
主要成果:
- HNM有效地吸附和中和OH-离子,保持稳定的界面pH.
- DFT计算证实了HNM的强OH-吸附 (Eads = -4.15 eV) 的情况.
- HNM抑制了HER和树突的生长,促进了均的Zn2+沉积.
- 在不对称的电池中,HNM@Zn阳极在1000个循环中实现了99.7%的库伦比效率.
- 在对称单元中稳定循环超过1750小时,在完整单元中经过1000个循环后具有130mAh-1的容量.
结论:
- 在AZIB中,HNM作为一个有效的多功能材料,用于界面pH调节.
- 工程界面增强了Zn2+离子运输和沉积动力学.
- 这一战略为实现高性能和耐用的水性离子电池提供了一条道路.
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