Size Dependent Fast Li Ion Storage Based on Size Regulated TiO2(B) Nanosheet Electrodes with Vertical, Horizontal and Random Alignment

• Main Authors: Tomohiro YOSHIDA, Daisuke TAKIMOTO, Dai MOCHIZUKI, Wataru SUGIMOTO
• Format: Article
• Language: English
• Published: The Electrochemical Society of Japan 2020-07-01
• Series: Electrochemistry
• Subjects: tio2; nanosheet; lithium ion intercalation
• Online Access: https://www.jstage.jst.go.jp/article/electrochemistry/88/4/88_20-00055/_pdf/-char/en

TiO2(B) has a high theoretical capacity of 335 mAh g−1 for Li+ intercalation and thus has been considered as a candidate for lithium-ion capacitor and Li-ion battery negative electrodes. For high rate lithium storage, i.e. high power density, it is important to shorten the Li+ diffusion path by using nanostructured TiO2(B). In this work, TiO2(B) nanosheet with different equivalent diameter of 300 nm and 30 nm were prepared. In addition, the orientation of the TiO2(B) nanosheets was manipulated by altering the deposition method and drying process. Smaller size TiO2(B) nanosheets had better Li+ intercalation ability compared to larger sized TiO2(B) nanosheets. The effect of alignment of the TiO2(B) nanosheets was evident for small-sized TiO2(B) nanosheets; vertical or random alignment of small-sized TiO2(B) afforded higher capacity compared to horizontally oriented nanosheets.