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Highly active cluster structure manganese‐based metal organic frameworks (Mn‐MOFs) like corals in the sea synthesized by facile solvothermal method as gas electrode catalyst for lithium‐oxygen batteries
Author(s) -
Lang Xiaoshi,
Dong Chunxi,
Cai Kedi,
Li Lan,
Zhang Qingguo
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4954
Subject(s) - materials science , cyclic voltammetry , electrode , catalysis , lithium (medication) , manganese , electrochemistry , chemical engineering , dielectric spectroscopy , linear sweep voltammetry , raman spectroscopy , inorganic chemistry , chemistry , metallurgy , organic chemistry , engineering , endocrinology , medicine , physics , optics
SUMMARY Lithium‐oxygen batteries are promising energy storage systems for electric vehicles owing to their very high specific capacity. In all of their components, the catalysts in the air electrode have a profound influence on its electrochemical performances, especially cycle life and specific energy. In this paper, a type of cluster structure manganese‐based metal organic frameworks (Mn‐MOFs) material is synthesized by facile solvothermal method. Through X‐ray diffraction (XRD), scanning electron microscope (SEM), and Raman spectrum tests, it shows that the Mn‐MOFs materials with the 1.3:1 molar ratio (Mn: p‐phthalic acid) have high crystallinity and orientation and show obvious cluster structure like corals in the sea. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests demonstrate that this MOFs material as the gas electrode catalyst has more excellent reversibility and the oxidation process. Furthermore, the air electrode has quick electronic and lithium ion transfer rate. In addition, the lithium‐oxygen batteries with this Mn‐based MOFs material as the air electrode catalyst have longer cycle life. After 35 times charge and discharge cycles, the specific discharge capacity can still be maintained over 500 mAh·g −1 , and it has the much higher discharge voltage platform.