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Author list |
Han-Jin Jeon, Rajesh Rajagopal, Jungjae Park, Sung Kang, Kwang-Sun Ryu |
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Abstract
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All-solid-state batteries(ASSLBs) as a next generation model of Li ion batteries can show high-energy density from bi-polar stacking and safety from removing flammable liquid electrolyte. In this study, to improve electrochemical performance of sulfide based ASSLBs, cathode mixture with halide solid electrolyte Li2ZrCl6 (LZC)- Li(Ni 0.8Co 0.1Mn 0.1)O2 (NCM811) was prepared to avoid direct physical contact between NCM811-Li6PS5Cl. Cathode mixtures (x wt% LZC-NCM811) was prepared through mixing with mortar and thinky mixer. Structural and morphological analysis was conducted with X-ray diffraction (XRD) and field-emission scanning electron microscopy&energy dispersive spectroscopy (FE-SEM&EDS) to confirm surface of NCM811 for each composition. Electrochemical performance was evaluated with galvanostatic charge/discharge, galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS). Initial specific capacity and coulombic efficiency of optimized composition(x = 4) is 190.7 mAh g−1, 84.6 %, which is higher than pristine NCM811 (173.1 mAh g−1, 75.2 %). Capacity retention rate of NCM811 and 4 wt% LZC-NCM811 is 91.3 and 74.1 %. Li+ diffusion coefficient of pristine NCM811 and x = 4 is 1.6 and 5.16 10-9 cm2 s−1. Total resistance of pristine NCM811 and x = 4 composition after cycling is 1367 and 160.5 Ω. |
