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在可逆Zn电池中调节精益离子动态的不稳定协调间相.
Chenxiang Wang1, Jason Zi Jie Zhu1, Samantha Vi-Tang1
1Department of Chemistry and Biochemistry and California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
Advanced materials (Deerfield Beach, Fla.)
|October 30, 2023
概括
研究人员开发了一种协调的介相,以稳定电池中的阳极. 这项创新提高了可充电性,并使高能量密度,低电解质电池用于大规模储能.
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:
- (Zn) 电池的可充电性受到阳极不可逆性的阻碍,特别是在薄电解质中,影响大规模应用的成本效益.
- 在阳极接口的化学腐蚀和副作用会降低电池的性能和寿命.
研究的目的:
- 开发一个协调的间相,以防止化学腐蚀和稳定阳极.
- 促进Zn2+离子与特定的配体的选择性结合,以增强离子传输.
- 为了使无树的电子沉积,并提高阳极的整体可逆性.
主要方法:
- 使用histidine和carboxylate连接物开发一个协调的间相.
- 实验性表征和计算模拟以了解相间特性.
- 在各种条件下对阳极和全电池 (ZngadgadgadLiMn2O4) 进行电化学测试.
主要成果:
- 互相证明了热力学稳定性和动力学可变性,促进了选择性Zn2+结合和快速扩散.
- 调节无树脂电沉积和减少副作用,实现超过200小时的可逆/脱落在20mA cm-2.2的可逆/脱落.
- 在500个循环后,一个Zn下载的LiMn2O4电池实现了74.7 mWh的g-1能量密度和99.7%的库伦比效率.
- 与赤裸阳极相比,带有介相的瘦电解质全电池的寿命是5倍 (100周期) 长.
结论:
- 不稳定协调间相有效地稳定了阳极,提高了电池的可充电性和寿命.
- 这种方法使高能量密度,低电解质电池成为可能,为电网规模的能源存储提供了一个有前途的解决方案.
- 该研究提供了通过控制界面协调化学来设计先进电池的概念验证.
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