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在Li-O2电池中Li2O2氧化过程的性质通过操作X射线衍射揭示出来

Swapna Ganapathy¹, Brian D Adams, Georgiana Stenou

¹Fundamental Aspects of Materials and Energy, Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology , Mekelweg 15, 2629 JB, Delft, The Netherlands.

Journal of the American Chemical Society

|October 24, 2014

概括

了解氧电池中的氧进化反应 (OER) 是关键. 这项研究揭示了电化学生成与散装过氧化物 (Li2O2) 之间的明显的OER机制,这对于提高电池性能至关重要.

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
电池技术电池技术

背景情况:

氧 (Li-O2) 电池提供了高的理论特定能量,推动了基础研究.
虽然释放机制已被理解,但充电过程中的氧进化反应 (OER) 仍然不清楚.
OER对于Li-O2电池的可逆性和性能至关重要.

研究的目的:

阐明在充电Li-O2电池时发生的氧化演化反应 (OER) 的基本机制.
为了研究电化学生成的Li2O2与散装晶体Li2O2.2.的OER途径的差异.
为了将Li2O2的性质和形态与其氧化行为相关联.

主要方法:

操作X射线衍射 (XRD) 在现场研究Li2O2氧化.
电化学分析用于监测反应进展和反应潜力.
支持实验观察Li空缺形成的第一原则计算.

主要成果:

电催化氧化Li2O2发生在两个阶段的电化学产生的材料,但一个阶段的散装晶体Li2O2.
电催化Li2O2氧化涉及一个非晶体阶段,其次是缺乏Li的固体溶液 (Li2-x) O2).
大量结晶Li2O2氧化表明Li1地点有偏好的Li空缺形成,这一点通过计算得到证实.

结论:

OER机制从根本上取决于Li2O2产品的性质和形态.
血小板形的Li2O2颗粒在氧化过程中被连续分解.
了解这些OER通路对于设计高性能Li-air电池具有较低超电位的先进电极至关重要.

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