%0 Journal Article
%A Yang, Yao
%A Zhang, Tao
%A Wang, Xiaochen
%A Chen, Linfeng
%A Wu, Nian
%A Liu, Wei
%A Lu, Hanlin
%A Xiao, Li
%A Fu, Lei
%A Zhuang, Lin
%D 2016
%T Tuning
the Morphology and Crystal Structure of Li2O2: A Graphene Model Electrode Study for Li–O2 Battery
%U https://acs.figshare.com/articles/journal_contribution/Tuning_the_Morphology_and_Crystal_Structure_of_Li_sub_2_sub_O_sub_2_sub_A_Graphene_Model_Electrode_Study_for_Li_O_sub_2_sub_Battery/3555690
%R 10.1021/acsami.6b05660.s001
%2 https://acs.figshare.com/ndownloader/files/5625246
%K electrochemical impedance spectroscopy
%K Li 2 O 2
%K Graphene Model Electrode Study
%K electrodeposited Pd nanoparticles
%K TEM
%K NP
%K model carbon electrodes
%K EIS
%K crystal structure
%K performance
%X The
performance and the cyclability of the Li–O2 batteries
are strongly affected by the morphology and crystal structure of Li2O2 produced during discharge. In order to explore
the details of growth and electrochemical decomposition of Li2O2, and its relationship with the cell performance,
graphene films were used as model carbon electrodes and compared with
electrodeposited Pd nanoparticles (NPs) on graphene. Multiple methods,
including transmission/scanning electron microscopy (TEM/SEM), Raman
spectroscopy, electrochemical impedance spectroscopy (EIS), and coin
cell charge/discharge test, were employed for material characterization
and reaction monitoring. The results showed that the presence of Pd
NPs significantly changed the growth, morphology, and crystal structure
of Li2O2 and reduced the charge overpotential
by 1060 mV. All of these changes are ascribed to the stronger binding
energy between LiO2 and the Pd surface, resulting in the
generation of amorphous Li2O2 with higher ionic
conductivity of Li+ and O22–, which in turn improve the cell charging performance.
%I ACS Publications