适应性电离诱导调节电双层用于广泛的pH和温度范围内的实用Zn金属电池
Chuyuan Lin1, Lingjun He1, Peixun Xiong2
1Engineering Research Center of Polymer Green Recycling of Ministry of Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental and Resources, Fujian Normal University, Fuzhou, Fujian 350007, People's Republic of China.
ACS nano
|November 13, 2023
概括
这项研究引入了适应pH的甘氨酸添加剂,以稳定水性电解质中的阳极,在各种pH条件下提高电池性能. 这项创新显著提高了金属电池的循环可逆性和寿命.
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
背景情况:
- 水性金属电池面临的挑战是由于金属的剧烈副作用反应,导致局部pH值波动和阳极破坏.
- 制定适应广泛pH值范围的策略对于提高这些电池的稳定性和性能至关重要.
研究的目的:
- 报告一种适应pH的电双层 (EDL) 策略,使用甘氨酸 (Gly) 添加剂在宽pH水性电解质中稳定阳极.
- 研究甘氨酸pH依赖的电离机制及其对阳极接口的影响.
主要方法:
- 利用甘氨酸作为水性电解质中的添加剂来调整阳极的电双层 (EDL) 特性.
- 研究了依赖pH值的甘氨酸离子化及其在电极内部海尔姆霍尔茨平面 (IHP) 上的吸附行为.
- 进行了电化学测试,包括对称的电池循环和各种电池配置 (ZnRawRawRawMnO2,ZnRawRawRawNiCo-LDH,ZnRawRawNi0.8Co0.1Mn0.1O2),以评估性能.
主要成果:
- 甘氨酸离子EDL促进了指导电荷载体迁移,抑制了酸性和性电解质的局部和.
- 甘氨酸添加剂,没有二分化,在IHP内形成有序,密集的垂直吸附,减少EDL排斥力,并将水从阳极表面隔离出来.
- 在Zn对称细胞中实现了7000小时的显著循环可逆性,在KOH-Gly电解质中延长了50倍的寿命.
- 在各种电池配置中表现出卓越的电化学性能,并实现了93%的超高放电深度 (DOD).
结论:
- 使用甘氨酸开发的可调节EDL策略有效地稳定了阳极在广泛的pH和温度范围内.
- 这种方法为设计符合各种操作条件的电解质添加剂提供了一个有希望的途径,用于实际的阳极应用.
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