Metal organic frameworks route to prepare two-dimensional porous zinc- cobalt oxide plates as anode materials for lithium-ion batteries

摘要

Two-dimensional morphological (2DM) metal oxides are highly desirable for the improvement of electrochemical performance of lithium-ion batteries (LIBs). Herein, a facile and scalable strategy to fabricate porous 2DM zinc-cobalt oxide (ZCO) plates is reported, with the help of a morphology-maintained annealing treatment of metal organic frameworks (MOFs). Through change the proportion of metal nitrates in the precursors, a series of porous ZCO plates are synthesized. Thanks to the porous structure, 2DM morphological features and nano-sized building block of Co3O4 plates, the Co3O4 plates electrode as anode materials for LIBs display the high reversible capacity (1027mA hg(-1) at 100 mA g(-1) after 100 cycles), remarkable rate capability (541 mA h g(-1) even at 1000 mA g(-1)). Furthermore, this strategy of synthesizing the ZCO plates with MOFs provides a new approach to design bimetallic transition metal oxides that the ratio of transition metal is continuously adjusted and has great lithium storage properties.