PbSe/sulfur-doped carbon nanocube composites prepared from Pb-MOF precursors as anode materials for lithium and sodium-ion batteries

Abstract

PbSe/sulfur-doped carbon (SC) nanocube composites were successfully synthesized by a simple two-step method. Firstly, the lead-based metal organic framework (Pb-MOF) materials were synthesized by a simple room-temperature aqueous solution method. Then the Pb-MOF materials were used as precursor to react with selenium powder to prepare PbSe/SC nanocube composites in a vacuum quartz tube under high temperature. As the anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), the PbSe/SC nanocube composites exhibit excellent electrochemical performance, because the special microporous nanocube structure can provide more active sites for redox reaction and effectively reduce the volume expansion of PbSe materials, and sulfur-doped carbon can increase the electronic conductivity of the material. The PbSe/SC nanocube composites showed excellent high-rate performance (818.5 mAh g−1 after 800 cycles in LIBs at 2000 mA g−1) and cyclic performance (717.1 mAh g−1 in LIBs and 313.6 mAh g−1 in SIBs after 100 cycles at 100 mA g−1). The results show that PbSe/SC nanocube composites have great potential as anode materials for LIBs and SIBs.