Dec 2, 2024
2:30pm - 2:45pm
Hynes, Level 3, Ballroom C
Susmita Bera1,Lily Mandal1,Ripan Biswas1,Abhik Banerjee1
TCG Centres for Research and Education in Science and Technology1
Susmita Bera1,Lily Mandal1,Ripan Biswas1,Abhik Banerjee1
TCG Centres for Research and Education in Science and Technology1
Halide solid electrolytes have gained a lot of research attention in the past decade due to their wide electrochemical stability window, especially their high oxidative stability enables their use with high voltage cathodes. None the less their limited reduction stability against Li metal enforces a bilayer separator configuration with sulfide solid electrolytes in all solid-state batteries. However, there are indication/ concern of electrochemical incompatibility between the halide and sulfide solid electrolyte. Here, we study the chemical reactivity between sulfide SE Li
6PS
5Cl with halide SE by varying the central metal ion and their impact on cell performance in bilayer configuration. We performed operando electrochemical impedance spectroscopy, operando temperature dependent synchrotron X-ray diffraction, ex-situ X-ray photoelectron spectroscopy and differential scanning calorimetry to quantify the reactivity between the sulfide and halide SE. We infer, that the reaction kinetics is indeed determined by the central metal atom of the halide solid electrolyte with Li
3InCl
6 and Li
2ZrCl
6 being highly reactive with Li
6PS
5Cl whereas Li
3YCl
6, Li
3ScCl
6 and Li
3ErCl
6 being stable. Our work provides a guideline for selecting HSE and SSE pair for bilayer all solid-state batteries.