Foam-like CoO@N,S-codoped carbon composites derived from a well-designed N,S-rich Co-MOF for lithium-ion batteries

Abstract

Multiple heteroatom doping is identified as an effective method to realize superior anode materials for lithium-ion batteries (LIBs). In this study, a novel 4-fold interpenetrated dia MOF was synthesized and characterized and then used as a N,S-containing precursor to fabricate a foam-like CoO@N,S-codoped carbon hybrid composite via thermal treatment. In the composites, the outermost foam-like N,S-codoped carbon matrix can effectively buffer the drastic volume variations, enhance electronic conductivity, and prevent CoO nanoparticles from aggregation and pulverization during discharge/charge processes. Consequently, the novel hybrid nanomaterial exhibited excellent electrochemical properties as an anode material for LIBs. The specific capacity can retain a stable value of about 809 mA h g⁻¹ at a current of 1000 mA g⁻¹ within 500 cycles. As a proof-of-concept application, introduction of heteroatoms into MOFs can offer a valid method for doping the as-derived hybrid composites and then enhancing their performance as anodes of LIBs.