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一种多功能Zwitterion电解质添加剂,用于高度可逆的金属阳极
Xinlong Liu1, Bingang Xu1, Jian Lu1
1Nanotechnology Center, School of Fashion and Textiles, The Hong Kong Polytechnic University, Kowloon, 999077, Hong Kong.
Small (Weinheim an der Bergstrasse, Germany)
|November 10, 2023
概括
一种新型的添加剂,2-...N-morpholino) 乙硫酸 (MES),可以防止离子电池中的树状石的生长. 这一突破使得无树脂阳极的稳定接口和延长寿命.
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:
- 金属阳极对于高能量密度离子电池 (ZIB) 是有前途的.
- 无法控制的树突生长和寄生反应阻碍了阳极的可逆性和稳定性.
- 电解质优化提供了一个简单的策略来应对这些挑战.
研究的目的:
- 在ZnSO4电解质中作为新增添加剂引入2 - - N - 莫尔福利诺 - 乙硫酸 (MES).
- 调查MES抑制树形成和寄生虫反应的能力.
- 为了提高ZIB中阳极的稳定性和性能.
主要方法:
- 在常规的 ZnSO4 电解质中加入 MES,一种 zwitterionic pH 缓冲剂.
- 分析电双层 (EDL) 和化外.
- 密度函数理论 (DFT) 计算用于研究Zn2+沉积.
- 电化学涂层/剥离试验,以评估阳极性能.
主要成果:
- MES添加剂确保了没有树的阳极表面和稳定的Zn/电解质接口.
- MES的zwitterionic性质控制了solvated外,并平衡局部H+度,防止寄生虫反应.
- DFT计算证实了MES与Zn2+的亲和力,并促进了统一的 (002) 定向沉积.
- 经MES修改的Zn阳极表现出异常的涂层/剥离寿命 (1600小时在0.5 mA cm-2) 和高库伦比效率 (99.8%).
结论:
- MES是一种有效的添加剂,用于在水性ZIB中制造无树的阳极.
- 这种方法提高了阳极的稳定性和循环寿命.
- 这些发现为开发先进的水性能量存储设备提供了一个简单的策略.
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