Metal-organic frame-derived Sn/SnO2 nanoparticles anchored to octahedral porphyrins for lithium-ion storage

Abstract

Tin-based composites have been regarded as promising anode materials for lithium-ion batteries (LIBs). However, obvious challenges in volume expansion and poor ionic conductivity have hindered their further application in LIBs. In this study, an ingenious precursor – a nanoparticle metal–organic framework anchored to the Nickel (II)meso-Tetraphenylporphyin (NiTPP) composites was constructed. The precursor was annealed at different temperatures to obtain a variety of Sn-MOF/NiTPP composites. When utilized as an anode material for LIBs, the Sn-MOF/NiTPP composite exhibited excellent electrochemical properties at a heat treatment temperature of 300 °C and demonstrated reversible lithium storage capacity of 1050 mAh/g at a current density of 200 mA/g after 200 cycles. This can be attributed to the appropriate selection of heat treatment temperature and the incorporation of octahedral porphyrins that enhance charge transfer ability. Therefore, this study not only proposes a high-performance lithium-ion battery anode but also presents a novel approach for constructing metal/metal oxide-organic composites.