Ten Thousand-Cycle Ultrafast Energy Storage of Wadsley–Roth Phase Fe–Nb Oxides with a Desolvation Promoting Interfacial Layer
Yang Yang, He Zhu, Fei Yang, Fan Yang, Dongjiang Chen, Zhipeng Wen, Dongzheng Wu, Minghui Ye, Yufei Zhang, Jinbao Zhao, Qi Liu, Xihong Lu, Meng Gu, Cheng Chao Li, Weidong He
Abstract
Developing advanced electrode materials with enhanced charge-transfer kinetics is the key to realizing fast energy storage technologies. Commonly used modification strategies, such as nanoengineering and carbon coating, are mainly focused on electron transfer and bulk Li+ diffusion. Nonetheless, the desolvation behavior, which is considered as the rate-limiting process for charge-storage, is rarely studied. Herein, we designed a nitridation layer on the surface of Wadsley–Roth phase FeNb11O29 (FNO–x@N) to act as a desolvation promoter. Theoretical calculations demonstrate that the adsorption and desolvation of solvated Li+ is efficiently improved at FNO–x@N/electrolyte interphase, leading to the reduced desolvation energy barrier. Moreover, the nitridation layer can also help to prevent solvent cointercalation during Li+ insertion, leading to advantageous shrinkage of block area and reduced volume change of lattice cell during cycling. Consequently, FNO–x@N exhibits a high-rate capacity of 129.7 mAh g–1 with negligible capacity decay for 10 000 cycles.