In Operando Spatiotemporal Study of Li2O2 Grain Growth and its Distribution Inside Operating Li–O2 Batteries. Issue 2 (7th January 2014)

• Record Type: Journal Article
• Authors: Shui, Jiang‐Lan; Okasinski, John S.; Chen, Chen; Almer, Jonathan D.; Liu, Di‐Jia
• Is Part Of: ChemSusChem. Volume 7:Issue 2(2014:Feb.)
• Page Start: 543
• Page End: 548
• Publication Date: 2014-01-07
• Subjects: Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201300822
• Languages: English
• ISSNs: 1864-5631

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Nanocrystalline lithium peroxide (Li₂O₂) is considered to play a critical role in the redox chemistry during the discharge–charge cycling of the Li–O₂ batteries. In this report, a spatially resolved, real‐time synchrotron X‐ray diffraction technique was applied to study the cyclic formation/decomposition of Li₂O₂ crystallites in an operating Li–O₂ cell. The evaluation of Li₂O₂ grain size, concentration, and spatial distribution inside the cathode is demonstrated under the actual cycling conditions. The study not only unambiguously proved the reversibility of the Li₂O₂ redox reaction during reduction and evolution of O₂, but also allowed for the concentration and dimension growths of the peroxide nanocrystallites to be accurately measured at different regions within the cathode. The results provide important insights for future investigation on mass and charge transport properties in Li₂O₂ and improvement in cathode structure and material design.</p> </abstract>