Potassium Ions Promote Solution-Route Li2O2 Formation in the Positive Electrode Reaction of Li-O-2 Batteries

作者：Matsuda Shoichi; Kubo Yoshimi; Uosaki Kohei; Nakanishi Shuji^*

来源：Journal of Physical Chemistry Letters, 2017, 8(6): 1142-1146.

DOI：10.1021/acs.jpclett.7b00049

Lithium-oxygen system has attracted much attention as a battery with high energy density that could satisfy the demands for electric vehicles. However, because lithium peroxide (Li2O2) is formed as an insoluble and insulative discharge product at the positive electrode, Li-O-2 batteries have poor energy capacities. Although Li2O2 deposition on the positive electrode can be avoided by inducing solution-route pathway using electrolytes composed of high donor number (DN) solvents, such systems generally have poor stability. Herein we report that potassium ions promote the solution-route formation of Li2O2. The present findings suggest that potassium or other monovalent ions have the potential to increase the volumetric energy density and life cycles of Li-O-2 batteries.

• 出版日期2017-3-16