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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Charge compensation endows K0.16Na0.05(NH4)0.71V4O10-x·0.63H2O cathode with tunable lattice strain for efficient Zn2+
Xueke Zhu1, Dong Fang1, Lang Zhang1
1Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, P. R. China. fangdong@kmust.edu.cn.
Abstract:
The major challenges in using NH4V4O10 as a cathode for aqueous zinc-ion batteries (AZIBs) are its unsatisfactory structural stability and carrier migration coefficient due to the accumulated lattice strain during cycling. Herein, we developed a K0.16Na0.05(NH4)0.71V4O10-x·0.63H2O (NaKNVOH) cathode to achieve a continuous contribution of cathode structure for Zn2+ storage at both low and high current density. Both experimental data and DFT calculations confirmed that the charge compensation of Na+ and K+ not only reinforced the host structure but also enriched the active sites for Zn2+ migration. Especially, the structure-led charge compensation effectively alleviated the lattice strain accumulation during prolonged cycling. The NaKNVOH cathode delivered a specific capacity of 495.4 mAh g-1 at 0.5 A g-1, a rate capability of 177.8 mAh g-1 at 4 A g-1, and excellent cycle life and capacity retention at current densities of 0.5 A g-1 (300 cycles, 94.2%) and 4 A g-1 (2000 cycles, 96.57%).
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