Affiliation of Author(s):材料科学与技术学院
Journal:ACS Appl. Mater. Interfaces
Abstract:Lithium metal is considered to be one of the most potential anode materials on account of its high theoretical specific capacity and lowermost electrochemical potential. Nevertheless, the critical challenges of dendrite growth and low Coulombic efficiency (CE) of the lithium metal anode during cycling prevent the commercial application of the lithium metal battery. Herein, rubidium fluoride (RbF) as additives is utilized to inhibit the lithium dendrite growth. Benefiting from the stronger electropositive property of Rb+, it can adsorb on the surface of protuberances during the lithium deposition process, form an electrostatic shielding field of the surface, and guide the uniform deposition of Li+. The CE can maintain above 90% with the additives of RbF in the carbonate electrolyte. Besides that, RbF improves the cycle life and decreases the polarization, a stable cycling performance of more than 1000 h is obtained, and the overvoltage is controlled below 100 mV in the cycling test of Li∥Li symmetrical cells at 0.5 mA cm-2. The addition of RbF offers a feasible way for the development of lithium metal batteries (LMBs) in the future. © 2019 American Chemical Society.
ISSN No.:1944-8244
Translation or Not:no
Date of Publication:2019-06-12
Co-author:Li, Shaopeng,Dou Hui,Zhang Xiaogang
Correspondence Author:fangshan
Date of Publication:2019-06-12