Improved lithium storage performance of CeO2-decorated SrLi2Ti6O14 material as an anode for Li-ion battery

Abstract In this work, the CeO2-decorated SrLi2Ti6O14 anode was successfully prepared through a solid-state process. The space-charge effect induced by the internal adsorption of ions on the CeO2 surface can easily result in a formation of an excellent conductive interfacial layer between CeO2 and SrLi2Ti6O14. The good electrical contact between CeO2 and SrLi2Ti6O14 offers more active sites for the electrolyte storage and redox reaction, and promotes the intercalation/deintercalation of lithium ions, and thus improves the rate performance and cycle stability. Due to its unique structure and composition, the CeO2-decorated SrLi2Ti6O14 composites exhibit high reversible capacities, good cycle performance and outstanding rate performance. Especially, the CeO2 (5 wt%)-decorated SrLi2Ti6O14 anode shows the most excellent electrochemical performance, which delivers a large charge capacity of 121.3 mAh g−1 and a capacity retention of 94.48% after 100 cycles at 0.5 A g−1. However, the corresponding charge capacity and capacity retention of pristine SrLi2Ti6O14 are 100.5 mAh g−1 and 86.77%, respectively. The CeO2(5 wt%)-decorated SrLi2Ti6O14 with enhanced rate capacity, cycle stability and structural stability is a potential electrode material candidate for Li-ion battery.