Tuning the electrochemical stability window of Li3YCl6 by fluorine doping to enable 4.8V solid-state battery

DOI: 10.1149/1945-7111/ae67aa

Authors: Lily Mandal (TCG Centres for Research and Education in Science and Technology (TCG CREST)) , Susmita Bera (TCG Centres for Research and Education in Science and Technology (TCG CREST)) , Ripan K. Biswas (TCG Centres for Research and Education in Science and Technology (TCG CREST)) , Abhik Banerjee (TCG Centres for Research and Education in Science and Technology (TCG CREST))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The Electrochemical Society

State: Published (Approved)
Published: May 2026
Diamond Proposal Number(s): 35312

Abstract: Lithium batteries with enhanced energy density and safety require solid electrolytes having stability with High voltage cathodes and Li metal. Here, halide solid electrolyte Li3YCl6 is doped with Fluorine to simultaneously increase the cathodic and anodic stability. The anodic and cathodic stability was confirmed cyclic voltammetry, impedance spectroscopy and operando pressure measurement. Further, operando X-ray photoelectron spectroscopy (XPS) during Li plating on Li3YCl5.9F0.1 was done to study effect of Fluorine on reaction kinetics driving the evolution of interphase with Li metal and its composition. Li3YCl5.9F0.1 shows stable plating striping for more than 500 h and has very high critical current density of 8 mA/cm2. Li3YCl5.9F0.1 based ASSB operating at high voltage of 4.8 V vs Li maintains a high discharge capacity of 124 mAhg-1 at C/3 rate at room temperature after 180 cycles confirming excellent electrochemical performance. Further, Li3YCl5.9F0.1 as separator enable Li metal based ASSB.

Diamond Keywords: Batteries; Solid-State Batteries (SSB); Lithium-ion

Subject Areas: Chemistry, Materials, Energy


Instruments: I15-1-X-ray Pair Distribution Function (XPDF)

Added On: 06/05/2026 10:49

Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Diffraction X-ray Powder Diffraction