Highly stable Fe2O3@SnO2@HNCS hollow nanospheres with enhanced lithium-ion battery performance

Abstract

Iron-based nanomaterials are regarded as prospective candidates for lithium-ion battery anodes. However, their inferior cycling stability and volume variation restrict further application in many fields. Herein, hollow Fe₂O₃@SnO₂@HNCS nanospheres are synthesized by calcination, followed by hydrothermal process. Electrochemical tests reveal that Fe₂O₃@SnO₂@HNCS exhibits superior lithium storage performance. When the current density is 2 A g⁻¹, a discharge capacity of 375.3 mA h g⁻¹ is obtained after 500 cycles with capacity retention of 44.7%. Lithium storage kinetic analysis indicates that the Fe₂O₃@SnO₂@HNCS electrode exhibits elevated capacitive controlled process and enhanced lithium diffusion coefficient. These results demonstrate that constructing nanomaterials comprising nanosized building blocks and rigid frameworks can create high performance lithium-ion battery anodes.