Screening for Superoxide Reactivity in Li-O2 Batteries: Effect on Li2O2/LiOH Crystallization
Screening for Superoxide Reactivity in Li-O2 Batteries: Effect on Li2O2/LiOH Crystallization
复制标题
DOI：
10.1021/ja2111543
复制
发表时间：
2012-02-15
影响因子：
15
通讯作者：
Nazar, Linda F.
中科院分区：
文献类型：
--
作者：
Black, Robert;Oh, Si Hyoung;Nazar, Linda F.
解开Li-O-2电池化学的基本原理对于开发具有接近其高理论值的能量密度的实用电池至关重要。我们在这里报告一种直接的化学方法，它探测超氧化物O-2(-)的结果，被认为启动了电池中的电化学过程。我们表明，这是一个很好的衡量电解质和粘结剂稳定性的指标。超氧化物很容易使聚偏氟乙烯脱氢生成副产物，这些副产物与催化剂反应生成LiOH。Li2O2产物的形态是这些因素的函数，并会影响Li-O-2电池的性能。该方法可广泛应用于其他潜在细胞成分的检测。
Unraveling the fundamentals of Li-O-2 battery chemistry is crucial to develop practical cells with energy densities that could approach their high theoretical values. We report here a straightforward chemical approach that probes the outcome of the superoxide O-2(-), thought to initiate the electrochemical processes in the cell. We show that this serves as a good measure of electrolyte and binder stability. Superoxide readily dehydrofluorinates polyvinylidene to give byproducts that react with catalysts to produce LiOH. The Li2O2 product morphology is a function of these factors and can affect Li-O-2 cell performance. This methodology is widely applicable as a probe of other potential cell components.