Study on colloidal synthesis of ZnS nanospheres embedded in reduced graphene oxide materials for sodium-ion batteries and energy storage mechanism
Youngho Jin, Honggyu Seong, Joon Ha Moon, So Yi Lee, Sung Kuk Kim, Min Yang, Jin Bae Lee, Se Youn Cho, Jaewon Choi
Abstract
With growing demands for large-scale energy storage, metal sulfides have received great attention due to their high theoretical capacity as anode materials for sodium-ion batteries (SIBs). However, metal sulfides have a problem of poor stability. Thus, it is important to find suitable solutions. In this work, uniform ZnS nanospheres (ZnS NSs) are synthesized through a wet chemical method. And then, by compounding with reduced graphene oxide (rGO), ZnS [email protected] are synthesized in which ZnS NSs are evenly distributed on rGO. When we evaluate the cycle performance, ZnS [email protected] deliver a high discharge capacity of 634.6 mA h g−1 at a current density of 0.5 Ag−1 after 1000 cycles. Through charge/discharge processes of in-situ XRD analysis, we confirm the sodiation/desodiation mechanism of ZnS [email protected]