Flower-like SnS2/honeycomb-like g-C3N4 composite as an anode material for high-rate, long-term lithium-ion batteries

Abstract

The electrochemical performance of lithium-ion batteries (LIBs) can be improved by developing new structural composite materials. Therefore, this study uses a hydrothermal technique to produce flower-like SnS2 anchored on H-g-C3N4 (honeycomb-like g-C3N4) nanosheets. At higher current densities, the SnS2-H-g-C3N4-HC composite demonstrates superior cycle stability, high-rate capacity, and structural integrity for LIBs. The LIBs that employ SnS2-H-g-C3N4-HC as an anode exhibit high-rate performance, long-term stability, and a high discharge capacity of 370.7 mAh g−1 at 10C after 3000 cycles with a 100.3 % coulombic efficiency. The enormous surface area of the SnS2-H-g-C3N4-HC composite electrode provides highly active sites and increases the passage of lithium ions during charge and discharge cycles. It is also responsible for the outstanding electrochemical performance of the electrode. Further, the SnS2-H-g-C3N4-HC composite electrode has a synergistic effect that lowers the charge-transfer resistance, making it possible for Sn and lithium ions (Li+) to react during charge and discharge cycles. H-g-C3N4, which acts as a spacer, can buffer changes in volume effectively and reduce SnS2 electrode collapse or clumping after many cycles.