07 Dec Toward High-Voltage Solid-State Li-Metal Batteries with Double-Layer Polymer Electrolytes Back to Sci. Publications
AUTHORS
M. Arrese-Igor, M. Martinez-Ibañez, E. Pavlenko, M. Forsyth, H. Zhu, M. Armand, M. Armand, and P. López-Aranguren
JOURNAL
ACS Energy Letters, 7, 4, 1473–1480
DATE
25th March 2022
ABSTRACT
Solid polymer electrolyte batteries with a Li-metal anode and high-voltage active materials hold promising prospects to increase the energy density and improve the safety of conventional Li-ion batteries. An adequate choice of the polymers used for the cathode (catholyte) and for the separator (electrolyte) to create a sufficient energy gap and improve the chemical compatibility at both the positive electrode and Li-metal anode is required. The present work highlights the advantages of the double-layer polymer electrolyte approach in cells with a LiNixMnyCozO2 active material, a poly(propylene carbonate) (PPC) catholyte, and a poly(ethylene oxide) (PEO) electrolyte. Replacing PEO in the catholyte with PPC results in a remarkably improved cycling performance. In addition, the higher lithium transference number of electrolytes with single lithium ion conductors leads to a smooth cycling of solid-state batteries. Cells with 1 mAh cm–2 deliver 160 mAh g–1, with a capacity retention above 80% over 80 cycles and a Coulombic efficiency close to 100%.
KEYWORDS
Solid state Li metal battery; Solid polymer electrolyte; Poly(ethylene oxide); Poly(propylene carbonate); Single Li ion conductor; Double layer polymer electrolytes
