Boron-doped TiO2 anode materials for high-rate lithium ion batteries

• Published in: Journal of alloys and compounds 2014-08, Vol.604, p.226-232
• Main Authors: Jeong, Jae-Hun, Jung, Dong-won, Shin, Eun Woo, Oh, Eun-Suok
• Format: Article
• Language: English
• Subjects: Anode active material; Boron-doped titanium oxide; Chemistry; Electrochemical characterization; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; High-rate lithium-ion battery
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.03.069

•Boron(B)-doped TiO2 materials are successfully synthesized by a sol–gel method.•Boron(B)-doped TiO2 materials have an excellent electrochemical performance.•Boron(B)-doped TiO2 with high B-dopant concentration shows a high capacity of 119.4mAhg−1 at 10C in the 100cycles. Boron(B)-doped TiO2 (BT) materials are synthesized through a simple one-pot process using a sol–gel method, and are employed as anode materials in Li-ion batteries. The increase of B-dopant concentration up to 10.4wt% in BT samples increases the interplanar spacing between TiO2 lattices from 3.33Å to 4.33Å, and the BET surface area from 27.7m2g−1 to 90.6m2g−1. Additionally, the BT sample containing a relatively large amount of B possesses cylindrical pores that are favorable for lithium-ion transfer, leading to the highest diffusion coefficient. Consequently, the BT anodes with high B-dopant concentration exhibit significantly-improved cyclic capacities at 100cycles: 166.9mAhg−1 at 1C and 119.4mAhg−1 at 10C, whereas the non-doped BT sample, TiO2, exhibits 107.7mAhg−1 at 1C and 19.9mAhg−1 at 10C at 100cycles.