Sulfur-Rich (NH4)2Mo3S13 as a Highly Reversible Anode for Sodium/Potassium-Ion Batteries

• Published in: ACS nano Vol. 14; no. 8; pp. 9626 - 9636
• Main Authors: Ding, Shuangshuang, Zhou, Bingxin, Chen, Changmiao, Huang, Zhao, Li, Pengchao, Wang, Shuangyin, Cao, Guozhong, Zhang, Ming
• Format: Journal Article
• Language: English; Japanese
• Published: American Chemical Society 25.08.2020
• Subjects: highly reversible anode; low-temperature batteries; sodium/potassium-ion batteries; (NH4)2Mo3S13; storage mechanism
• ISSN: 1936-0851; 1936-086X; 1936-086X
• DOI: 10.1021/acsnano.0c00101

Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) have attracted much attention owing to the inexpensive Na/K metal and satisfactory performance. Currently, there are still difficulties in research anode materials that can insert/extract Na/K ions quickly and stably. Herein, the sulfur-rich (NH4)2Mo3S13 is proposed as the anode for SIBs/PIBs and is obtained by a hydrothermal method. The sulfur-rich (NH4)2Mo3S13 with a three-dimensional structure shows a high capacity and long lifespans for Na+ (at 10 A g–1 the capacity of 165.2 mAh g–1 after 1100 cycles) and K+ (120.7 mAh g–1 at 1 A g–1 retained after 500 cycles) storage. In addition, the (NH4)2Mo3S13 electrode exhibits excellent electrochemical performance at low temperatures (0 °C). The mechanism of Na+ storage in (NH4)2Mo3S13 can be innovatively revealed through the combined use of electrochemical kinetic analysis and a series of ex situ characterization tests. It is believed that the present work identifies (NH4)2Mo3S13 as a promising anode for the SIBs/PIBs and will be of broad interest in research on engineering sulfur-rich transition metal sulfide and on energy storage devices.