Stable bismuth-antimony alloy cathode with a conversion-dissolution/deposition mechanism for high-performance zinc batteries
Volume 51, Issue , Page 87–95
| Feng Jiang, Hu Hong, Donghong Wang, Qing Li, You Meng, Zhaodong Huang, Ying Guo, Xinliang Li, Ao Chen, Rong Zhang, Shaoce Zhang, Johnny C. Ho, Zhenpeng Yao, Weishu Liu, Chunyi Zhi
Abstract: Although a large number of intercalation cathode materials for aqueous Zn batteries have been reported, limited intercalation capacity precludes achieving a higher energy density. Here we develop a high-performance aqueous Zn battery based on BiSb alloy (Bi0.5Sb0.5) using a high-concentrated strong-basic polyelectrolyte. We demonstrate that a conversion-dissolution/deposition electrochemical mechanism (BiSb ↔ Bi + SbO2− ↔ Bi + SbO3− ↔ Bi2O3) through in situ X-ray diffraction (XRD), Raman, and ex-situ X-ray photoelectron spectrometry (XPS) characterizations with the help of density functional theory calculations. The BiSb cathode delivers large capacity of 512 mAh g−1 at 0.3 Ag−1 and superior rate capability of 90 mAh g−1 even at 20 Ag−1, and long-term cyclability with capacity retentions of 184 mAh g−1 after 600 cycles at 0.5 Ag−1 and 130 mAh g−1 after 1300 cycles at 1 Ag−1. Remarkably, even at temperatures as low as −10 and −20 °C, capacities of 210 and 197 mAh g−1 are reserved at 1 Ag−1, respectively. Moreover, the prepared pouch Zn//BiSb battery delivers a high energy density of 303 Wh kg−1BiSb at 0.3 Ag−1. When coupled with a high concentration polyelectrolyte, the Zn/BiSb battery exhibits an excellent performance over a wide temperature range (−40 to 40 °C). Our research reveals the metal cathode is promising for Zn batteries to achieve a high performance with the unique mechanism and alloys can be an effective approach to stabilize metal electrodes for cycling.
Read full text on ScienceDirect
DOI: 10.1016/j.mattod.2021.09.023
Share this journal article