当前位置: X-MOL 学术ACS Energy Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Growth of NaO2 in Highly Efficient Na–O2 Batteries Revealed by Synchrotron In Operando X-ray Diffraction
ACS Energy Letters ( IF 22.0 ) Pub Date : 2017-09-22 00:00:00 , DOI: 10.1021/acsenergylett.7b00768
Chenjuan Liu 1 , David Rehnlund 1 , William R. Brant 1 , Jiefang Zhu 1 , Torbjörn Gustafsson 1 , Reza Younesi 1
Affiliation  

The development of Na–O2 batteries requires understanding the formation of reaction products, as different groups reported compounds such as sodium peroxide, sodium superoxide, and hydrated sodium peroxide as the main discharge products. In this study, we used in operando synchrotron radiation powder X-ray diffraction (SR-PXD) to (i) quantitatively track the formation of NaO2 in Na–O2 cells and (ii) measure how the growth of crystalline NaO2 is influenced by the choice of electrolyte salt. The results reveal that the discharge could be divided into two time regions and that the formation of NaO2 during the major part of the discharge reaction is highly efficient. The findings indicate that the cell with NaOTf salt exhibited higher capacity than the cell with NaPF6 salt, whereas the average domain size of NaO2 particles decreases during the discharge. This fundamental insight brings new information on the working mechanism of Na–O2 batteries.

中文翻译:

X射线衍射中同步加速器揭示的高效Na–O 2电池中NaO 2的生长

Na–O 2电池的开发需要了解反应产物的形成,因为不同的小组报告了主要放电产物如过氧化钠,超氧化钠和水合过氧化钠等化合物。在本研究中,我们在操作同步辐射粉末X射线衍射(SR-PXD)中使用了(i)定量跟踪Na–O 2细胞中NaO 2的形成,以及(ii)测量结晶NaO 2的生长方式受电解质盐选择的影响。结果表明,放电可以分为两个时间区域,NaO 2的形成在放电的大部分期间,反应是高效的。该发现表明,具有NaOTf盐的电池比具有NaPF 6盐的电池表现出更高的容量,而NaO 2颗粒的平均畴尺寸在放电期间减小。这种基本见解为Na-O 2电池的工作机理带来了新的信息。
更新日期:2017-09-23
down
wechat
bug