Preparation, structural, and characterizations of SnO₂‐coated TiNb₂O₇ anode materials for lithium‐ion batteries

Abstract

SnO 2 -coated TiNb 2 O 7 powders were synthesized via the solution coating method in the present research. The SnO 2 layers with a thickness of 3-5 nm were homogeneously coated on the surface of TiNb 2 O 7 particles. TiNb 2 O 7 coated with SnO 2 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 TiNb 2 O 7 was owing to the low chargetransfer resistance of 17.5 Ω in contrary to the non-coated TiNb 2 O 7 (27.8 Ω).SnO 2 -coated TiNb 2 O 7 possessed an improved capacity retention of 85.2% at 5 C after 100 cycles, superior to the non-coated TiNb 2 O 7 (79.8%). On the other hand, the excessive amounts of SnO 2 coating led to the reduction in the capacity of the prepared samples. The excessive amounts of SnO 2 layers suppressed the Li + diffusion and increased the charge-transfer resistance. The obtained results in this study indicated that coating of TiNb 2 O 7 with appropriate amounts of SnO 2 significantly improved the electrochemical performance of TiNb 2 O 7 .

Microwave‐assisted synthesis and electrochemical characterization of TiNb2O7microspheres as anode materials for lithium‐ion batteries

“…In this study, a novel microwave‐assisted solvothermal method is adopted to develop uniformly distributed spherical particles. Microwave irradiation is chosen to impart both energy and time savings in the developed process 32–35 . The influence of microwave irradiation on the physical and electrochemical properties of TiNb 2 O 7 powders is systematically analyzed by comparing those of the solvothermal synthesized TiNb 2 O 7 powders.…”