Layered Bimetallic Metal‐Organic Material Derived Cu 2 SnS 3 /SnS 2 /C Composite for Anode Applications in Lithium‐Ion Batteries

Here, we report the synthesis of a bimetallic 2D interpenetrated metal‐organic material (MOM) and its use as a sacrificial precursor for the formation of a Cu 2 SnS 3 /SnS 2 /C composite. The one‐step sulfurisation of the novel Sn/Cu‐MOM represents a facile method for the preparation of an effective anode material for Li‐ion battery applications. The Cu 2 SnS 3 /SnS 2 /C composite was characterised by XRD, TGA, TEM and SEM. Electrochemical analysis was conducted on SnCu 2 SnS 3 /SnS 2 /C anodes in half cell configurations between 0–3 V and 0–1 V. Anodes cycled between 0–1 V exhibited markedly more stable capacity retention (315 mAh/g after 100 cycles), as only alloying of the Li with Sn took place within this potential window, compared to a combination of conversion and alloying for the wider potential range. This stability of the Li alloying based capacity was further enhanced by replacing the planar Cu foil with a rough dendritic Cu foil as the current collector, resulting in an improved capacity retention of 84 % after 100 cycles.