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The urgent expectation of the next-generation energy storage devices for electric vehicles has driven researchers' attention to the lithium-oxygen (Li-O2) batteries due to the satisfied specific energy density. Herein, spatially-controlled Co3O4 nanoflake arrays with three-dimensional- networked morphology are adopted as flexible and self-standing oxygen cathodes in Li-O2 batteries. The spinel-phase Co3O4 nanoflakes were converted from two-dimension metal-organic frameworks with abundant available channels and large specific surface area. The open-structure nanoflake arrays possess sufficient Li2O2/cathode contact interface, great bifunctional catalytic performance and adequate Li2O2 accommodation, leading to the enhanced electrochemical performance of the Li-O2 batteries. As expected, the binder-free porous Co3O4/CT cathode delivers a high capacity of 6, 509 mAh·g-1 (200 mA·g-1) and enhanced stability over 100 cycles (limited by 1, 000 mAh·g-1). In addition, pouch-type Li-O2 batteries were successfully designed and cycled with Co3O4/CT cathode as oxygen electrodes, demonstrating its potential application for flexible electronics and wearable energy storage devices.
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