Understanding the Role of Nano‐Aluminum Oxide in All‐Solid‐State Lithium‐Sulfur Batteries

Abstract

Aluminum oxide (Al2O3) is a well‐known electrolyte filler for stabilizing the Li‐metal (Li0) anode in all‐solid‐state Li0‐based batteries. However, its strong interactions with lithium polysulfides (PS) hinder the direct application of Al2O3‐added electrolytes in all‐solid‐state lithium‐sulfur batteries (ASSLSBs). Herein, the role of Al2O3 in ASSLSBs both as electrolyte filler and cathode additive is studied. The combination of Al2O3‐added electrolyte and Al2O3‐added S8 cathode with optimum cell configuration could deliver an unprecedented discharge capacity of 0.85 mAh cm−2 (C/10, 30 cycles) for polymer‐based ASSLSBs. These results suggest that the rational incorporation of Al2O3 can lead simultaneously to PS anchoring and Li0 anode stabilizing benefits from the ceramic filler, thus improving the electrochemical performance of ASSLSBs.

Fluorine‐Free Noble Salt Anion for High‐Performance All‐Solid‐State Lithium–Sulfur Batteries

“…d) Comparison of the cycling performance for the Li–S cells using LiX/PEO (X = TCM or TFSI) electrolytes at the same EO/Li of 20. For comparison, the raw data of LiTFSI sample are reprocessed; Adapted with permission . Copyright 2019, Wiley‐VCH Verlag GmbH & Co. KGaA.…”

Current status and future perspectives of lithium metal batteries

“…Then, the PEO chains show similar discharge slopes like an ether based solvent which is a strong hint that they dissolve lithium polysulfides very well. The beneficial role of ceramic fillers, both ion-conductive and non-conductive [309][310][311][312], has not been fully understood yet. It should be pointed out that fillers with high mass density increase the ionic conductivity, but might lower the overall energy density of the final prototype cell [313].…”

Lithium-Ion-Engineered Interlayers of V2C MXene as Advanced Host for Flexible Sulfur Cathode with Enhanced Rate Performance

“…Sulfur is a promising cathode material with multiple advantages, including a high theoretical capacity, nontoxicity, and low cost. − However, several serious issues, such as the shuttle effect, volume change during the charge/discharge process, and poor electron/ion conductivity, extremely hinder the future applications of lithium–sulfur (Li–S) batteries. − The nonpolar carbon materials were first employed as a sulfur matrix to improve the electronic conductivity and constrain the volume expansion during cycling. − However, the intrinsic weak chemical interaction between nonpolar carbon and polar polysulfide species renders the sulfur electrode still suffering from considerable decay. , On the contrary, polar materials, such as metal oxide, − metal sulfide, − and MXenes, − have gained more and more attention as the sulfur matrix in recent years. Because of the strong affinity between polar materials and polysulfides, the dissolution and diffusivity of the polysulfides can be greatly alleviated, contributing to the enhanced cycling stability. − …”