Liquid-phase synthesis of Li6PS5Br using ultrasonication and application to cathode composite electrodes in all-solid-state batteries

Abstract

Lithium-ion conductive Li6PS5Br is prepared using ultrasonication of Li2S, P2S5 and LiBr in ethyl propionate-ethanol solution and subsequent heating at 453 K. The main phase of the synthesized product is Li6PS5Br and its lithium ion conductivity is 3.4 × 10 −5 S cm −1 at room temperature. The cathode composite of LiCo1/3Ni1/3Mn1/3O2, Li6PS5Br and vapor grown carbon fiber (VGCF) is prepared via ultrasonication of the Li6PS5Br precursor solution containing LiCo1/3Ni1/3Mn1/3O2 and VGCF, and the all-solid-state lithium battery using this cathode composite is fabricated. The cell exhibits the discharge capacity of 109 mAh g-1 for the first cycle and its capacity of 87 mAh g-1 after 10 cycles.

Boosting Solid‐State Diffusivity and Conductivity in Lithium Superionic Argyrodites by Halide Substitution

“…Total ionic conductivities are heavily influenced by the synthesis method, grain boundary contributions, and methods used for conductivity measurements, including sintering cold‐pressed pellets . Solution‐based Li 6 PS 5 X synthesis routes typically give lower ion conductivities (10 −5 –10 −4 mS cm −1 ) owing to phase impurities although recent studies using this method report high values for Li 6 PS 5 Cl and mixed anion Li 6 PS 5 (Cl,Br) argyrodites of 2.4 and 3.9 mS cm −1 , respectively; and 3.1 mS cm −1 for Li 6 PS 5 Br . A conductivity of 3.15 mS cm −1 for Li 6 PS 5 Cl was reported prepared by a rapid solid‐state route and a value of 5 mS cm −1 was recently achieved upon long‐term annealing, albeit using pellets pressed at eight tons .…”

Synthesis and characterization of argyrodite solid electrolytes for all-solid-state Li-ion batteries

“…Electrodes using SE-coated composites have been reported to achieve better electrochemical performance compared to non-coated active materials. For example, cathode materials of Li 6 PS 5 Cl-coated LiCoO 2 [24,34] [35], and Li 6 PS 5 Cl-coated Li 2 S [36] using solution processes (EtOH as solvent) show higher capacities than those using a powder mixing method;…”

Instantaneous preparation of high lithium-ion conducting sulfide solid electrolyte Li7P3S11 by a liquid phase process

“…The implosion of cavitation bubbles during ultrasonication generate local high temperatures and pressures, and this large amount of energy stimulates chemical activity. 20,21 Herein we report for the rst time an instantaneous preparation of high lithium-ion conducting sulde solid electrolyte Li 7 P 3 S 11 by a simple procedure involving a liquid phase process and ultrasonic irradiation.…”