*2.2. Electrochemical Cycling*

Electrochemical tests were performed using a CR2016-type coin cell that employed lithium foil as the counter electrode. The working electrode was fabricated by creating a slurry from 85% active material (which was the newly fabricated SnS/C), 5% super P carbon black, and 10% polyvinylidene fluoride (PVDF), and then coating it on a copper foil, which was the current collector.

The coin cells were assembled in an argon-filled glove box (Mikarouna, Superstar 1220/750/900) with 1 M LiPF6 solution with ethylene carbonate–diethyl carbonate (EC– DEC = 1:1, *v*/*v*) as the electrolyte and Celgard 2300 as the separator. The galvanostatic charge–discharge tests were performed in a battery test system (Land CT2001A, Wuhan Jinnuo Electronic Co., Ltd., China) at a constant current density of 50 mA g−<sup>1</sup> in the potential range from 0 to 2.5 V. Finally, electrochemical impedance spectroscopy (EIS) of the Sn/C anodes was conducted through a potentiostat/galvanostat system (Autolab PGSTAT302N, Riverview, FL, USA).
