SnS nanoplate coated with crystalline silicon-oxy carbide as composite anode for lithium-ion storage applications
Perumal Naveenkumar, Munisamy Maniyazagan, Hyeon-Woo Yang, Woo Seung Kang, Sun-Jae Kim
In this work, SiOC, and SnS@SiOC composite have been prepared by thermal pyrolysis method, whereas SnS is prepared by CTAB-assisted hydrothermal method. The presence of a crystalline carbon phase in a SiOC is identified by high-magnification TEM images. The nanoplate-like morphology of SnS and the nanoparticle nature of silicon-oxy carbide are established by SEM and TEM images. The Chemical state of elements in the SnS@SiOC composite is validated by X-ray photoelectron spectroscopy. CV graphs exposed SiOC behaving non-faradic process; SnS and SnS@SiOC composite behaves combined lithium-ion storage mechanism. The rate capability nature of SnS@SiOC composite is superior to SnS and SiOC electrode materials. The initial discharge capacity of SiOC, SnS, and SnS@SiOC is 1191 mAh g−1, 1007 mAh g−1, and 1315 mAh g−1 @ 0.1 A g−1 respectively. At a current density of 1 A g−1, it provided the 1000th cycle discharge capacity of 196.8, 437.5, and 570 mAh g−1 for SiOC, SnS, and SnS@SiOC composite, respectively. Even though, it delivered a discharge capacity of 448.7 and 491.8 mAh g−1 for SnS and SnS@SiOC composite after 800 cycles @ 5 A g−1. It has a capacity retention of 94 % and 90 %, respectively. Silicon oxy carbide and SnS work synergistically to increase lithium-ion storage capacity and cycle stability for long-term energy storage and conversion applications.