Electrochemical characterization of TiNb2O7 as anode material synthesized using microwave‐assisted microemulsion route

• Published in: Journal of the American Ceramic Society Vol. 105; no. 12; pp. 7446 - 7454
• Main Authors: Liang, Kai‐Hsiang, Som, Sudipta, Gupta, Karan Kumar, Lu, Chung‐Hsin
• Format: Journal Article
• Language: English
• Published: Columbus Wiley Subscription Services, Inc 01.12.2022
• Subjects: anode; Anodes; capacity retention; Charge transfer; Discharge; discharge capacity; Electrochemical analysis; Electrode materials; Grain growth; Micelles; microemulsion; Microemulsions; microwave; Synthesis
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.18694

TiNb2O7 materials were synthesized via a microwave‐assisted microemulsion technique and a conventional solid‐state reaction route. Microwave‐assisted microemulsion process produced TiNb2O7 powders with small particle sizes (50–100 nm) and increased surface area (22.4 m2/g) in comparison to the samples synthesized from solid‐state method. Micelles in the microemulsion acted as nano‐reactors and confined the grain growth of TiNb2O7. The microwave‐assisted microemulsion‐derived TiNb2O7 powders presented a high discharge capacity of 333.2 mAh/g at 0.1C. The materials also delivered 94.8% retention at 5C after 100 cycles. The solid‐state derived samples only processed the 283.2‐mAh/g discharge capacity at 0.1C with 83.2% retention at 5C after 100 cycles. The amended capacity and cyclability of microwave‐assisted microemulsion‐derived TiNb2O7 resulted from the augmented Li+ diffusion and the diminished charge transfer resistance. It was also found that the microwave‐assisted microemulsion‐derived TiNb2O7 delivered 208 mAh/g discharge capacity at 10C, which was higher than solid‐state derived samples (92 mAh/g). The improved capacity was owing to the enhancement in pseudocapacitive contribution. Present research indicated that the microwave‐assisted microemulsion method effectively enhanced the electrochemical performance of TiNb2O7 powders.