长寿命的水性-流电池是通过选择性拦截水合离子来实现的
Zhiquan Wei1, Yiqiao Wang1, Hu Hong1
1Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China.
Nature communications
|October 21, 2025
概括
一种新的离子分子膜通过控制水运输和减少离子穿来稳定水性-流电池. 这项创新使在恶劣条件下可实现超过2000小时的稳定循环,提高了电网储能可行性.
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- (Zn-I) 流电池提供安全,经济高效的电网存储.
- 在 Zn 阳极循环过程中由于离子失衡而导致的水迁移限制了实际的 Zn-I 电池性能,特别是在苛刻的条件下.
研究的目的:
- 开发一种膜,用于调节Zn-I流电池中的水和离子运输.
- 为了提高电解质平衡,并减轻与 Zn 阳极反应相关的挑战.
主要方法:
- 设计和合成一个量身定制的离子分子面膜与亚纳米孔径 (0.55-0.65纳米).
- 系统地调查膜在调节水/离子集群运输中的性能.
- 在恶劣条件下测试Zn-I流电池循环稳定性,库伦比效率和自放电率.
主要成果:
- 最优的膜选择性地拦截了大型水合离子集群,并减少了聚化的穿.
- 在恶劣的条件下 (50%充电状态) 实现了超过2000小时 (500个周期) 的稳定循环.
- 展示了高能量密度 (66.4 mAh cm−2),低自放电率 (98.5% Coulombic效率在3天后),以及具有竞争力的均衡储存成本 (551.98 美元 MWh−1).
结论:
- 开发的离子分子膜有效控制水的运输,并改善Zn-I流电池中的电解质平衡.
- 这种膜技术可以在具有挑战性的条件下实现长寿命,稳定的运行,从而增强了电网规模储能的潜力.
- 这些发现为设计下一代流电池系统的先进膜提供了关键的见解.
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