Indexed by: Journal paper

Journal: Rare Metals

Included Journals: SCI

Affiliation of Author(s): School of Electrical and Electronic Engineering, Huazhong University of Science and Technology

Discipline: Engineering

First-Level Discipline: Material Science and Engineering

Document Type: J

DOI number: 10.1007/s12598-021-01804-2

Date of Publication: 2021-08-08

Impact Factor: 4.003

Abstract: The replacement of liquid electrolytes with solid electrolytes can significantly improve the safety and power/energy density of lithium batteries. 70Li2S-30P2S5 is one of the most promising solid electrolytes with high conductivity for solid-state batteries. In this work, the ionic conductivity and stability towards moisture and lithium metal of 70Li2S-30P2S5 were enhanced by introducing the different amounts of Li2O additives. 65Li2S-30P2S5-1%Li2O delivered the highest conductivity, while 65Li2S-30P2S5-5%Li2O showed the best moisture stability and improved lithium compatibility. Solid-state batteries using 65Li2S-30P2S5-5%Li2O electrolyte and high voltage LiNi0.6Mn0.2Co0.2O2 cathode exhibited low initial discharge capacity (100 mAh/g) and coulombic efficiency (69%). Li3InCl6 electrolytes were introduced both in the cathode mixture to replace sulfide electrolyte and in the interface layer to improve the cathode compatibility for the solid-state batteries, showing enhanced discharge capacity (175 mAh/g) and improved initial coulombic efficiency (86%). Moreover, it also exhibited good performance at -20 oC.