Scale-Up of Halide-Based All-Solid-State Batteries

All-solid-state batteries (ASSBs) offer improved safety and potential higher energy density for energy storage. Among the components of ASSBs, the solid electrolyte plays an important role as it is the key component to prevent dendrite growth and forms interfaces with the cathode and anode. Halide solid electrolytes gain significant attention due to the high ionic conductivity, low processing temperature, good formability, oxygen resistivity and high-voltage stability. Our previous study demonstrated the feasibility of scaling up halide electrolyte and halide-containing cathode by tape casting, using toluene as a solvent and MSB1-13 as a binder.¹ A low-voltage cathode (LiFePO₄) was used and cell performance was tested in button cell size with a 0.5 cm² area. In this study, pouch cells are manufactured, involving 80% cathode active material (LiNi_0.82Mn_0.07Co_0.11O₂) loading and Li/In alloy anode. A pouch cell is cycled under a lower stack pressure and results of long-term cycling will be reported. The interfacial resistance of pouch cells is higher than that of button cells with the same composition as the stack pressure for button cells is much higher (100 MPa). Cells with Li metal anode are also explored with an anode interlayer, cycling in a voltage window of 3-4.3 V, and the cell performance will be compared with that of the cells with Li/In alloy anode.<br/><br/>Reference:<br/>1. F. Shen, M. McGahan, J. D. Pietras, G. Y. Lau, M. M. Doeff, V. S. Battaglia and M. C. Tucker, <i>J Electrochem Soc</i>, 2023, <b>170</b>, 100505.