Ångström Advanced Battery Centre (ÅABC), Department of Chemistry-Ångström Laboratory , Uppsala University , Box 538, SE-75121 Uppsala , Sweden.
ACS Appl Mater Interfaces. 2018 Apr 25;10(16):13534-13541. doi: 10.1021/acsami.8b01516. Epub 2018 Apr 12.
Na-O batteries are regarded as promising candidates for energy storage. They have higher energy efficiency, rate capability, and chemical reversibility than Li-O batteries; in addition, sodium is cheaper and more abundant compared to lithium. However, inconsistent observations and instability of discharge products have inhibited the understanding of the working mechanism of this technology. In this work, we have investigated a number of factors that influence the stability of the discharge products. By means of in operando powder X-ray diffraction study, the influence of oxygen, sodium anode, salt, solvent, and carbon cathode were investigated. The Na metal anode and an ether-based solvent are the main factors that lead to the instability and decomposition of NaO in the cell environment. This fundamental insight brings new information on the working mechanism of Na-O batteries.
钠离子电池被认为是很有前途的储能候选者。与锂氧电池相比，它们具有更高的能量效率、倍率性能和化学可逆性；此外，钠的价格比锂更便宜，储量也更丰富。然而，放电产物的不一致观察和不稳定性抑制了对这项技术工作机制的理解。在这项工作中，我们研究了影响放电产物稳定性的许多因素。通过在位粉末 X 射线衍射研究，考察了氧气、钠阳极、盐、溶剂和碳阴极的影响。钠金属阳极和醚基溶剂是导致电池环境中 NaO 不稳定和分解的主要因素。这项基础研究为钠离子电池的工作机制提供了新的信息。
