Tailoring Li₆PS₅Br ionic conductivity and understanding of its role in cathode mixtures for high performance all-solid-state Li–S batteries

Abstract

By tailoring the Br ordering over the 4a and 4c sites, Li6PS5Br with ultrafast ionic conductivity was achieved, which can be worked as both active material and solid electrolyte in all-solid-state Li–S batteries.

Engineering the Site‐Disorder and Lithium Distribution in the Lithium Superionic Argyrodite Li6PS5Br

“…[ 2–5 ] The lithium argyrodites Li 6 PS 5 X (X = Cl, Br, I) especially have been explored in a variety of solid‐state batteries. [ 6–10 ] Whereas there are still many challenges in the context of interfacial stability, the argyrodite compositions Li 6+ x P 1− x M x S 5 I, [ 6,11,12 ] Li 6+ x Sb 1− x M x S 5 I (M = Si, Ge), [ 13 ] and Li 6− x PS 5− x (Cl, Br) 1+ x [ 3,4,14 ] exhibit conductivities in the range that is needed for all‐solid‐state‐batteries. However, a better understanding of the fundamental structure–transport correlations in the argyrodites is needed to further promote even faster ionic transport.…”

In‐situ Generated Ultra‐High Dispersion Sulfur 3D‐Graphene Foam for All‐Solid‐State Lithium Sulfur Batteries with High Cell‐Level Energy Density

“…[22][23][24] By reducing the particle size, [25,26] a high dispersion and a relatively large contact area are obtained, which counteract the insulating behavior of the active materials and reach higher utilization of sulfur. [27][28][29] Yu et al used ball milling and heat treatment to get composite particles can deliver an initial discharge capacity of 1523 mAh g À 1 ( 91% ) at 0.1 C. [30] Yamada et al used Li 3 PS 4 and high energy ball milling to get amorphous composite particles can exhibit discharge capacity of 1600 mAh g À 1 ( 95% ) at 0.05 C. [31] Han et al used ball milling and heat treatment to get 5 nm core-shell S@BP2000 composite can achieve large interface area between sulfur nanoparticles and porous carbon, and achieved the discharge capacity of 1391.3 mAh g À 1 ( 83% ) at 0.2 C and 678.6 mAh g À 1 at 4 C at RT with high sulfur utilization under high discharge-charge rate. [32] By reason of the high speed running and longtime milling, a lot of energy is consumed, which makes the large-scale production and its practical application more difficult.…”

Building Better Batteries in the Solid State: A Review

“…Li 6 PS 5 X ( X = Cl, Br, I) argyrodites exhibit a very high ionic conductivity of 2.58 × 10 −3 S cm −1 for X = Br after annealing at the optimum temperature of 550 °C [94], and 1.8 10 −3 S cm −1 before the annealing, with a relatively good stability toward metallic lithium [95]. The MoS 2 /Li 6 PS 5 X all-solid-state batteries assembled with Li 6 PS 5 Cl-coated MoS 2 as the cathode, Li 6 PS 5 Cl as the solid electrolyte, and an indium-lithium alloy as the anode delivered a stable capacity of 350 mAh g −1 at the current density of 0.13 mA cm −2 .…”