法拉第效率
阴极
锂(药物)
异质结
电化学
材料科学
无定形固体
电极
纳米技术
化学工程
化学
光电子学
物理化学
结晶学
医学
工程类
内分泌学
作者
Yuting Gu,Yue Ma,Wei Le,Yuebin Lian,Ying He,Yanhui Su,Xinjian Li,Yang Peng,Zhao Deng
标识
DOI:10.1002/batt.202200222
摘要
Abstract The morphological control and spatial accommodation of Li 2 O 2 discharge products on the oxygen cathode are crucial to bolstering both the Coulombic and round‐trip efficiencies of Li−O 2 batteries. Herein, MoS 2 /MoN heterostructures are constructed on carbon cloth to serve as the freestanding and binder‐free oxygen cathode for Li−O 2 batteries, lending a low charge/discharge polarization of 0.79 V, a large specific capacity of 9.04 mAh cm −2 , and a superb cycling stability beyond 800 h. Through comprehensive microscopic, electroanalytical and density function theory analyses, the superb electrochemical performance is attributed to the formation of a conformal and amorphous Li 2 O 2 layer, which is kinetically driven in virtue of the higher electric conductivity of MoN and stronger LiO 2 intermediate adsorption on the heterostructures. This work advocates the merits of interfacial engineering to enhance the performance of Li−O 2 batteries by manipulating the discharge product formation.
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