Enhancing the Rate Capability of Niobium Oxide Electrode through Rare‐Earth Doping Engineering. Issue 11 (2nd September 2019)

• Record Type: Journal Article
• Authors: Yin, Dandan; Zhao, Hongyang; Li, Na; Si, Rui; Sun, Xiaolei; Li, Xinghua; Du, Yaping
• Is Part Of: Batteries & supercaps. Volume 2:Issue 11(2019)
• Page Start: 924
• Page End: 928
• Publication Date: 2019-09-02
• Subjects: rare-earth elements -- lithium-ion battery -- niobium oxide -- high rate; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.201900069
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Niobium oxide is considered one of the most promising electrode materials for ultrafast electrochemical energy storage devices with high energy density. In this work, we first found that trace amounts (<1 %) of Yb 3+ doping remarkably enhanced the rate capability of T−Nb2 O5, which was further proved to be because of the formation of a thin layer of amorphous YbNbO x . The capacity of YbNbO x ‐coated Nb2 O5 reached 124 mAh g −1 at 20 C, which is the highest value reported among pristine Nb2 O5 electrodes. Besides, we found that doping with other rare‐earth elements such as Nd 3+, Sm 3+, and Gd 3+ can also improve the rate capability of T−Nb2 O5 . It can be concluded that rare‐earth doping can be an effective and robust method to enhance the intrinsic rate performance of electrode materials without complicated modifications. Abstract : Rare doping : A YbNbO x layer is used to coat mesoporous T−Nb2 O5 and demonstrates remarkedly enhanced rate capability. The excellent performance is due to the strong interaction at the T−Nb2 O5 /YbNbO x interface, which generates surface defects and therefore accelerated lithium‐ion diffusion