Alleviating polarization by designing ultrasmall Li₂S nanocrystals encapsulated in N-rich carbon as a cathode material for high-capacity, long-life Li–S batteries

Abstract

Lithium sulfide with a high theoretical specific capacity of 1166 mA h g−1, has potential application in cathodes because of its high safety and compatibility for Li–S batteries.

Bipolar nitrogen-doped graphene frameworks as high-performance cathodes for lithium ion batteries

“…S3 †). 37 As summarized in Fig. S3c, † the amounts of different N atoms in the N-GFs change with the thermal treatment temperature.…”

A Micelle Electrolyte Enabled by Fluorinated Ether Additives for Polysulfide Suppression and Li Metal Stabilization in Li-S Battery

“…At present, many of the strategies reported to address this issue are focused on modification of electrode structures. These strategies include physically and/or chemically confining polysulfide intermediates within a hierarchical matrix (Wang et al, 2015;Wu et al, 2015) or crosslinked organic structure (Li et al, 2019), blocking contact between polysulfide and electrolyte by building protective layers/shells on the cathode surface (Hu et al, 2016;Wu et al, 2018), forming stable/protective SEI layers on the anode surface using electrolyte additives (e.g., LiNO 3 ) (Aurbach et al, 2009), and developing template configurations that allow solid-state conversion of nanoconfined sulfur (S 2−4 ) (Xin et al, 2012;Li et al, 2014).…”

Methods and Cost Estimation for the Synthesis of Nanosized Lithium Sulfide

“…The third route is to slowly add the ethanol solution of Li 2 S to other solvents with low Li 2 S solubility, causing the Li 2 S to precipitate into small particles. [52] A combination of two or more of these methods is also possible. [52,53] As shown in Figure 5g-i, with an ethanol solution of Li 2 S slowly added to the dimethylformamide (DMF) solution of polyacrylonitrile (PAN), Li 2 S precipitated because of its low solubility in DMF, and PAN coated the Li 2 S particles when the solvent evaporated and was carbonized in the next process.…”

“…g) Schematic illustration of the production h) SEM image and i) TEM image of the nano-Li 2 S@N-rich carbon composites. g-i) Reproduced with permission [52]. Copyright 2016, Royal Society of Chemistry.…”