Publication date: 10th April 2024
In the pursuit of advancing high energy density batteries, the incorporation of solid electrolytes as integral components in all-solid-state batteries (ASSBs) is a matter of significant interest. This solution may enable the next-generation batteries with better performances. In addition, it targets to replace the flammable liquid organic electrolyte used in current Li-ion technology in safe electric vehicles that complies with a net-zero world goals. [1]
Among different types of solid-state electrolytes, halide-based inorganic materials have gained the remarkable attention in the battery field. They are known to have high ionic conductivities, compatibility with high-voltage cathode materials and wide electrochemical stability windows. Herein, we focus on lithium indium chloride (Li3InCl6) that presents ionic conductivity values exceeding 1 mS/cm at room temperature. [2] The combination of inorganic electrolytes and polymers in hybrid solid electrolytes (HSEs) makes possible their processing in the current battery manufacturing lines. [3, 4]
Our study is based on Li3InCl6 electrolyte and different non-conducting polymers such as styrene-ethylene-butylene-styrene (SEBS) and polyisobutylene (PIB) in order to get flexible and self-standing thin membranes (< 30 μm) with a high inorganic content (58 vol. %). This work aims to understand the ionic conduction transport across the halide-based HSEs but also boost the design and fabrication of advanced materials suitable for Li-metal all-solid-state battery applications. For this, we study the effect of SEBS and PIB polymers on the Li-ion transport properties in the hybrid electrolyte. This research includes electrochemical impedance spectroscopy (EIS) the inorganic-polymer interface characterization, which reveals the significant impact of the polymer on the ionic conductivity properties. Moreover, we investigate dependence of the stack pressure on ionic conductivity and Li+-diffusion in the system by EIS and PFG NMR measurements.
This work has received financial support from the European Union's Horizon Europe research and innovation programme under grant agreement No 101069726(SEATBELT project). The authors acknowledge the financial support by the Spanish Ministry of Science, Agencia Estatatal de Investigacion (PID2020-115080RA-I00) in POLYHYBRID project.
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