Facile synthesis of porous CoFe2O4 nanosheets for lithium-ion battery anodes with enhanced rate capability and cycling stability†
Abstract
Porous CoFe2O4 nanosheets, having the thickness of 30–60 nm and lateral size of several microns with numerous penetrating pores, are synthesized via thermal decomposition of (CoFe2)1/3C2O4·2H2O nanosheets, which are facilely prepared through a poly(vinyl alcohol)-assisted precipitation-cum-self-assembly process in an aqueous medium. The obtained porous CoFe2O4 nanosheets are employed as anodes in lithium-ion batteries (LIBs). The anode exhibits excellent rate capability and cycling stability. When discharging–charging at 1 A g−1 and 2 A g−1, it can deliver discharge capacities as high as 806 mA h g−1 and 648 mA h g−1, respectively, each for 200 cycles. This makes the porous CoFe2O4 nanosheets promising candidates for anode materials in high-energy and high-power LIBs.
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