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Fluorine and Copper Codoping for High Performance Li2O-Based Cathode Utilizing Solid-State Oxygen Redox
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DOI：10.1021/acsaem.9b00574.png)
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Transition-metal-doped Li2O cathodes using redox reaction of solid-state oxygen are candidates as high capacity cathode materials for lithium-ion batteries. In our previously reported study, copper-doped Li2O (CuDL) exhibited a high charge-discharge capacity of 300 mAh g(-1). However, the developed cathode not only exhibited poor cyclability but also decomposed during charge-discharge cycles. In this study, fluorine and copper were codoped into the Li2O structure by stepwise mechanochemical reaction to create a high performance cathode with high cyclability. Fluorine-, copper-doped Li2O (F-CuDL) was prepared by the mechanochemical reaction of Li2O with LiF, followed by a reaction with CuO. The F-CuDL cathode exhibited a good cycle performance (300 mAh g(-1), 30 cycles at a constant current of 50 mA g(-1)). X-ray diffraction (XRD) and Cu K-edge X-ray absorption near edge structure (XANES) analyses revealed that F-CuDL does not undergo decomposition even after charge-discharge cycles, revealing that doping with fluorine leads to the stabilization of the CuDL crystal structure.
Keyword:
improvement of cyclability
fluorine and copper codoping
Li2O-based cathode
solid-state oxygen redox
lithium-ion battery
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