Metal–organic framework mediated nickel doped copper ferrite for superior lithium storage†
‡*a
Hongyu
Gong
*b
Abstract
The increasing demand for innovative lithium-ion batteries (LIBs) has significantly inspired the search for vigorous electrodes with higher specific capacity. Herein, a metal–organic framework (MOF) mediated approach was applied to fabricate a series of Cu1−xNixFe2O4-based/carbon (Cu1−xNixFe2O4@C) composites having diverse nanostructures. Starting from elegant Cu1−xNixFe2O4 particles, the controlled growth of MOFs is then applied on their surfaces followed by carbonization, establishing a recognizable core/shell structure. The crystalline phase and morphology of as-obtained samples have been systematically characterized. Benefiting from a well-designed core/shell structure, all the optimized products displayed superior lithium (Li) storage performance in LIBs. The obtained Cu1−xNixFe2O4@C provides a high reversible capacity of 813 mA h g−1 with a current density of 100 mA g−1 up to 100 cycles. Even under conditions of 500 mA g−1 up to 500 cycles, the beneficial core/shell structure can still provide a discharge capacity of 722 mA h g−1. Therefore, this work extends the scope of MOFs as coating materials and clarifies the Li storage performance of Cu1−xNixFe2O4-based materials.
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