Preparation, structural, and characterizations of SnO2-coated TiNb2O7 anode materials for lithium-ion batteries
Journal
Journal of the American Ceramic Society
Date Issued
2022
Author(s)
Abstract
SnO2-coated TiNb2O7 powders were synthesized via the solution coating method in the present research. The SnO2 layers with a thickness of 3–5 nm were homogeneously coated on the surface of TiNb2O7 particles. TiNb2O7 coated with SnO2 of 5 mol% with high Li+ diffusion coefficient delivered the discharge capacity of 319.5 mAh/g, which was 6.6% higher than that of the non-coated samples. The enhancement of capacity for the coated TiNb2O7 was owing to the low charge-transfer resistance of 17.5 Ω in contrary to the non-coated TiNb2O7 (27.8 Ω). SnO2-coated TiNb2O7 possessed an improved capacity retention of 85.2% at 5 C after 100 cycles, superior to the non-coated TiNb2O7 (79.8%). On the other hand, the excessive amounts of SnO2 coating led to the reduction in the capacity of the prepared samples. The excessive amounts of SnO2 layers suppressed the Li+ diffusion and increased the charge-transfer resistance. The obtained results in this study indicated that coating of TiNb2O7 with appropriate amounts of SnO2 significantly improved the electrochemical performance of TiNb2O7. © 2022 The American Ceramic Society.
Subjects
electrochemical performance; iNb2O7; lithium-ion batteries; SnO2 coating
SDGs
Other Subjects
Anodes; Charge transfer; Coated materials; Electric discharges; Lithium compounds; Lithium-ion batteries; Anode material for lithium ion batteries; Charge transfer resistance; Coated sample; Coating methods; Discharge capacities; Electrochemical performance; Inb2O7; Li +; SnO2 coating; Synthesised; Coatings
Type
journal article