ChemElectroChem
ChemElectroChem
4 years ago

Role of a Topotactic Electrochemical Reaction in a Perovskite-Type Anode for Lithium-Ion Batteries

Role of a Topotactic Electrochemical Reaction in a Perovskite-Type Anode for Lithium-Ion Batteries
Da Li, Shaohong Liu, Chengsheng Ni, Jianing Hui, Jiupai Ni
One of the mechanisms for some transition-metal oxides as anodes of a lithium-ion battery (LIB) is their conversion into variable-valence oxides or even metals. The conversion reaction involves oxide-ion transport and the formation/decomposition of Li2O, but very limited research has been done on the oxide-ion transport of the anodes. Perovskite-type oxides containing transition elements show high tolerance to oxygen-deficiency and high oxide-ion conductivity, which could benefit the oxide-ion transport and structural stability. In this study, a CaMnO3-based perovskite involving little volumetric variation upon oxygen uptake/release is examined to study the intermediate oxygen-deficient product, and the loss of oxygen is found to follow the route of a topotactic electrochemical reaction. In particular, the conversion reaction of the perovskite involves the formation of oxygen-deficient perovskite and rocksalt-type CaMnO2 depending on the grain size. Testing the tolerance: The conversion reaction involves oxide-ion transport and the formation/decomposition of Li2O, but very limited research has been done on the oxide-ion transport of the anodes. The heavy alkaline/rare earth element in a perovskite for structural stability decreases the specific capacity, but perovskite-type oxides show high tolerance to oxygen deficiency and high oxide-ion conductivity, which could benefit the study on oxide-ion conduction.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700381

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