无粘合剂LiMn2 O4 碳布上的纳米薄膜,用于通过电容性脱离离子从盐水中选择性提取
Guangqiang Ma1,2,3, Yingsheng Xu3, Anjiang Cai1
1School of Mechanical and Electrical Engineering, Research Institute of Membrane Separation Technology of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|October 7, 2023
概括
这项研究引入了一种新的无粘合剂阴极,用于选择性地从盐湖盐水中提取,使用LiMn2O4纳米片. 该材料表现出高容量,优异的稳定性和对离子的选择性.
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
- 环境科学 环境科学
背景情况:
- 从盐水中提取对于电池生产至关重要.
- 电容脱离离子 (CDI) 是一种有前途的离子分离方法.
- 开发选择性和稳定的电极是有效回收的关键.
研究的目的:
- 在碳布上制备LiMn2O4纳米片 (LMOns@CC) 作为选择性提取的无粘合剂阴极.
- 为了评估混合CDI电池中的LMOns@CC电极的电化学性能和稳定性.
- 用DFT计算和真实盐水样本研究电极对Li+离子的选择性.
主要方法:
- 一个三步合成策略:电化学沉积,自我氧化和热水反应.
- 制造具有层次纳米结构的无粘合剂LMOns@CC电极.
- 电化学表征包括充/放电试验和循环稳定性评估.
- 密度函数理论 (DFT) 计算以了解Li+选择性机制.
主要成果:
- 该LMOns@CC阴极在1.2V时表现出4.71 mmol g-1的最大Li+电吸能力.
- 实现了卓越的循环稳定性,在十个循环中保持了97.4%的容量.
- 与其他离子相比,DFT的计算证实了Li+的吸附能量更高,验证了选择性.
- 在天然盐湖盐水中进行选择性提取,其选择性系数为7.48,在100个循环中具有很好的稳定性.
结论:
- 无粘合剂的LMOns@CC电极有效用于从盐湖盐水中选择性提取.
- 该材料的层次纳米结构和电化学特性有助于其高性能.
- 这种电极显示了从自然资源中回收的实际应用的巨大潜力.
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