对于高压水性-电池,I+的尿素化
Cuicui Li1, Haocheng Li2, Xiuyun Ren3
1School of Energy and Environment, City University of Hong Kong, Hong Kong, China.
ACS nano
|January 8, 2025
概括
尿素在水性-电池中稳定不稳定的离子 (I+),达到创纪录的1.8V电压. 这一突破提高了电池性能和稳定性,用于实际应用.
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:
- -电池利用I-/I0/I+氧化还原对来实现高容量和高电压.
- 酸 (I+) 不稳定性和水解限制了-电池的实际性能.
- 目前的策略集中在间素化学上来激活I0/I+对,但实际的电压仍然不够理想.
研究的目的:
- 为了完全激活和稳定水性-电池中的I0/I+氧化还原对.
- 为了提高-电池的工作电压和电化学稳定性.
- 研究尿素作为I+离子的稳定剂的作用.
主要方法:
- 在传统的水性电解质中利用尿素作为成本有效的化剂.
- 采用了理论计算,光谱学研究和电化学测试.
- 研究了I+和尿素分子之间的协调化学.
主要成果:
- 实现了1.8V的创纪录的高平原电压,而不是Zn/Zn2+.
- 证明尿素协调在热力学上有利于I0/I+转换,并抑制I+自我不成比例.
- 由于尿素对水活性的影响,观察到抑制I+水解.
- 在1C时提供了419 mAh g-1的高特异容量,并在5C时经过10,000个循环后保留了147 mAh g-1
结论:
- 尿素有效地稳定I+离子,使水性-电池中的I0/I+氧化还原对完全激活.
- I+与尿素之间的协调显著增强了电化学动力学和可逆性.
- 基于尿素的电解质为开发高性能,稳定且无素的水性-电池提供了一个有希望的途径.
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