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一个人工电子-离子导体层的离子扩散定向组装,用于高度可逆的阳极的Zn-离子选择通道

Lei Liu¹, Jianli Cheng¹, Xilin Wang¹

¹Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China.

ACS applied materials & interfaces

|June 21, 2023

概括

这项研究引入了水性离子电池中阳极的新型保护层,有效防止树的生长并提高电池寿命. 这种新材料确保了更安全,更持久的储能解决方案.

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:

水性离子电池 (AZIB) 提供安全性和成本优势,但遭受阳极不稳定性 (树突,副作用).
不受控制的化/脱落导致AZIB的容量损失和周期寿命缩短.
有效的阳极保护对于实现AZIBs的实际潜力至关重要.

研究的目的:

开发一种用于阳极的保护性人工层,以抑制树突形成和副作用.
为了提高AZIB的电化学性能和循环寿命.
为了研究由人工层抑制树和离子调节的机制.

主要方法:

采用了一步离子扩散导向的组装策略,在阳极表面上创建一个人工层.
该层是使用商业可用的导电聚合物聚-3,4-乙烯二氧化硫烯:聚硫酸 (PEDOT:PSS) (PEDOT:PSS) 合成的,该聚合物与Zn2+功能化.
用对称细胞,长期循环测试和使用二氧化阴极的全细胞来评估电化学性能.

主要成果:

功能性PEDOT:PSS-Zn2+ (PPZ) 层充当具有选择性Zn离子通道的电子离子导体.
该PPZ层均地分配电流和Zn2+度,加速离子动力学,并阻断有害物种 (SO2-,H2).
修改后的阳极 (2PPZ@Zn) 显示出异常的稳定性:在对称的细胞中在3 mA cm-2下2400小时,在5 mA cm-2下500小时.
一个带有MnO₂阴极的完整电池实现了超过1500个循环,在10°C时保持75%的容量.

结论:

设计的电子离子导体人工层有效调节涂/脱落行为,增强阳极稳定性.
PPZ层提供了协同效应,改善了电子和离子运输,同时防止了副作用反应.
这种方法显著提高了高安全性,高性能水性离子电池的实际可行性.

关键词:

离子电池是一种离子电池.没有树石的树石.电子-离子导体层是一种电子-离子导体层.离子扩散定向组件组件金属阳极是一种金属阳极.

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