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在纳米封闭空间中氧电池的阴极化学

Hongyu Liu¹, Zhaohan Shen¹, Zheng-Ze Pan²

¹Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan.

ACS applied materials & interfaces

|August 17, 2023

概括

研究氧电池中的纳米孔尺寸揭示了过氧化物如何形成. 较小的毛孔 (25纳米) 促进薄膜,而较大的毛孔导致更厚的薄膜和晶体颗粒,影响电池性能.

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
储能储能储能储能储能储能

背景情况:

多孔碳阴极对于控制氧化物 (Li2O2) 在氧电池中的性能至关重要.
纳米孔尺寸对Li2O2形成和分解机制的影响需要进一步澄清.

研究的目的:

为了阐明不同纳米孔尺寸 (25-200纳米) 对氧电池中Li2O2沉积和分解的影响.
了解阴极纳米孔结构和Li2O2形态之间的关系.

主要方法:

在基底 (C/AAO_Al) 上使用碳涂层的阳极氧化膜制造一个高度排序的多孔阴极矩阵.
在C/AAO_Al阴极结构内纳米孔大小的系统变化.
分析Li2O2形成和形态作为纳米孔大小的函数.

主要成果:

在25纳米纳米孔中,形成了一层薄薄的薄膜状Li2O2层 (2-5纳米),表明表面驱动的机制.
随着纳米孔尺寸的增加,Li2O2膜厚度在10nm左右和.
较大的纳米通道促进晶体Li2O2颗粒的形成,表明一种溶液介导机制.

结论:

纳米孔尺寸显著决定了氧化电池中的Li2O2形态和形成机制.
表面驱动的Li2O2沉积在较小的纳米孔中占主导地位,而溶液介导的过程在较大的通道中变得相关.
了解这些依赖大小的现象是优化先进能源存储系统的正极设计的关键.

关键词:

电荷超潜在的电荷超潜在.可控尺寸的尺寸可以控制.过氧化的过氧化.纳米封闭是指纳米封闭.订购的纳米多孔阴极.

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