Indexed by: Journal paper

Journal: Materialia

Affiliation of Author(s): 华中科技大学电气与电子工程学院

Place of Publication: 荷兰

Discipline: Engineering

First-Level Discipline: Material Science and Engineering

Document Type: J

Volume: 26

Page Number: 101603-101609

ISSN No.: 101603

Key Words: Bromine-rich Lithium argyrodites Electrochemical performances Solid-state batteries Different operating temperatures

DOI number: 10.1016/j.mtla.2022.101603

Date of Publication: 2022-12-01

Teaching and Research Group: 电力系

Abstract: Solid-state batteries have attracted significant attention owing to their high energy density and high safety. Nevertheless, highly conductive solid electrolytes with ultrafast Li-ion mobility are in greatly demanded. In this work, bromine-rich argyrodite electrolytes have been synthesized by the typical high-rotation milling followed by an annealing method. The precursor with pure argyrodite structure is first obtained and a subsequent sintering process is applied to enhance the Li-ion conductivity. Br dopant is tailored to obtain the optimum composition with the highest conductivity. Li5.6PS4.6Br1.4 electrolyte delivers a high conductivity of 6.91 mS/cm at room temperature. The solid-state battery using the pristine LiNi0.6Mn0.2Co0.2O2 cathode and Li-In anode shows a high discharge capacity of 143.4 mAh g-1 and excellent capacity retention of 92.3% after 100 cycles at 0.2C under room temperature. Moreover, the assembled all-solid-state battery also displays high discharge capacities of 156.6 mAh g-1 at 0.2C under 60 oC and 97.1 mAh g-1 at 0.02C under -20 oC. Due to the good lithium metal compatibility of Li5.6PS4.6Br1.4 electrolyte, LiNi0.6Mn0.2Co0.2O2/Li5.6PS4.6Br1.4/Li all-solid-state Li metal is successfully constructed and displays excellent performances.