Highly Reversible Chevrel Phase Mo6Se8 Cathode with Low Voltage Hysteresis for Rechargeable Aluminum Batteries

• Published in: ACS applied materials & interfaces Vol. 15; no. 29; pp. 34698 - 34703
• Main Authors: Liu, Meng, Lv, Guocheng, Liu, Hao, Zhang, Jian, Liu, Tianming, Kong, Lingchang, Liao, Libing, Guo, Juchen
• Format: Journal Article
• Language: English
• Published: American Chemical Society 26.07.2023
• Subjects: Energy, Environmental, and Catalysis Applications; reversibility; voltage hysteresis; cycle stability; rechargeable aluminum battery; chevrel phase Mo6Se8
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.3c03231

Rechargeable aluminum (Al) batteries have attracted considerable interest as potential large-scale energy storage technologies due to the abundance, high theoretical capacity, and high safety of Al. We report here a highly reversible Al-Mo6Se8 prototype cell with low discharge–charge hysteresis (approximately 50 mV under 30 mA g–1 at 50 °C), ultra-flat discharge plateau, and exceptional cycle stability: the reversible capacity retaining at a steady 77 mA h g–1 after more than 1800 cycles. The Al intercalation-extraction mechanism is probed with ex situ and operando XRD techniques, revealing the reversible intercalation reaction from Mo6Se8 to Al4/3Mo6Se8. The stable electrochemical performance and unambiguous intercalation mechanism of the Al-Mo6Se8 system provide an alternative for beyond-lithium battery technologies.