Interlayer gap widened α-phase molybdenum trioxide as high-rate anodes for dual-ion-intercalation energy storage devices

• Published in: Nature communications Vol. 11; no. 1; p. 1348
• Main Authors: Yu, Minghao, Shao, Hui, Wang, Gang, Yang, Fan, Liang, Chaolun, Rozier, Patrick, Wang, Cai-Zhuang, Lu, Xihong, Simon, Patrice, Feng, Xinliang
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 12.03.2020; Nature Publishing Group; Nature Portfolio
• Subjects: 639/301; 639/301/299/161/891; 639/301/299/891; 639/638/161/891; Anodes; Batteries; Charge materials; Chemical Sciences; Electrochemistry; Electrodes; Energy; Energy charge; ENERGY STORAGE; Flux density; Humanities and Social Sciences; Intercalation; Interlayers; Kinetics; Layered materials; Material chemistry; Materials science; Molybdenum; Molybdenum oxides; Molybdenum trioxide; multidisciplinary; Product design; Science; Science (multidisciplinary); Specific capacity; Tradeoffs; Water chemistry; High-kinetics charge; Storage kinetics of electrodes; Promising design strategy
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-020-15216-w

Employing high-rate ion-intercalation electrodes represents a feasible way to mitigate the inherent trade-off between energy density and power density for electrochemical energy storage devices, but efficient approaches to boost the charge-storage kinetics of electrodes are still needed. Here, we demonstrate a water-incorporation strategy to expand the interlayer gap of α-MoO 3 , in which water molecules take the place of lattice oxygen of α-MoO 3 . Accordingly, the modified α-MoO 3 electrode exhibits theoretical-value-close specific capacity (963 C g −1 at 0.1 mV s −1 ), greatly improved rate capability (from 4.4% to 40.2% at 100 mV s −1 ) and boosted cycling stability (from 21 to 71% over 600 cycles). A fast-kinetics dual-ion-intercalation energy storage device is further assembled by combining the modified α-MoO 3 anode with an anion-intercalation graphite cathode, operating well over a wide discharge rate range. Our study sheds light on a promising design strategy of layered materials for high-kinetics charge storage. The power/energy trade-off is a common feature seen in a Ragone plot for an electrochemical storage device. Here the authors approach this issue by showing water-incorporated α-MoO 3 anodes with expanded interlayer gaps, which allow for the assembling of dual-ion energy storage devices.