Interfacing Si‐Based Electrodes: Impact of Liquid Electrolyte and Its Components (Adv. Mater. Interfaces 8/2022)

Abstract

Interfacing Si‐Based Electrodes: Impact of Liquid Electrolytes Cathode electrolyte interphase (CEI) is a highly influential however still underrated component of a battery cell. In article number 2101898, Christian Wölke, Isidora Cekic‐Laskovic, and co‐workers review CEI‐focused studies of the last decade highlighting different interphase performance enhancing additives, with the aim to light up new ideas, raising the motivation for further investigations in this research field.

Investigation of Polyacrylonitrile‐Derived Multiple Carbon Shell Composites for Silicon‐Based Anodes in Lithium‐Ion Batteries

“…[2] This results in irreversible consumption of lithium-ions and electrolyte constituents and the rise in cell polarization due to the insulating effect of a thick SEI layer, all leading to a fast capacity decay. [6][7][8] To overcome these challenges several approaches have been developed including nanosized or nanostructured active materials, [9] modified binders, [10,11] pre-lithiation, [12] electrolyte additives [13] and carbon surface coatings. [8] Carbon coatings can be achieved by dispersing silicon particles in organic carbon sources such as pitch, mono-and polysaccharides or polymers followed by a subsequent thermal treatment to carbonize and graphitize these substances.…”

“…To overcome these challenges several approaches have been developed including nanosized or nanostructured active materials, [9] modified binders, [10,11] pre‐lithiation, [12] electrolyte additives [13] and carbon surface coatings [8] . Carbon coatings can be achieved by dispersing silicon particles in organic carbon sources such as pitch, mono‐ and polysaccharides or polymers followed by a subsequent thermal treatment to carbonize and graphitize these substances [8,14] …”

Double Nitrogenation Layer Formed Using Nitric Oxide for Enhancing Li+ Storage Performance, Cycling Stability, and Safety of Si Electrodes

“…[ 9 ] Many approaches have been applied to overcome these problems, including electrode microstructure control, [ 10–13 ] electrode surface modification, [ 14–16 ] binder engineering, [ 17,18 ] and electrolyte composition optimization. [ 19–21 ] Numerous Si nanostructures have been developed to release the induced stress and strain during electrode cycling; however, their porosity (empty buffer space) decreases the electrode volumetric capacity and lowers the initial Coulombic efficiency (CE). A more practical and cost‐effective method for modifying Si anodes to increase mechanical/chemical stability and cyclability is highly desired.…”

Mechanistic Understanding of Additive Reductive Degradation and SEI Formation in High‐Voltage NMC811||SiOx‐Containing Cells via Operando ATR‐FTIR Spectroscopy

“…[ 17–19 ] A large number of sulfur‐based additives, like sultones and sulfonates, were already investigated regarding their SEI‐forming abilities and the resulting electrochemical cell performances. [ 18,20 ] Herein, as a case study combining electrochemical characterization, bulk electrolyte investigation, and interfacial spectroscopy, 2‐Sulfobenzoic acid anhydride (2‐SBA) is investigated as SEI‐forming electrolyte additive toward its electrochemical performance in high‐voltage lithium nickel manganese cobalt oxide (LiNi 0.8 Mn 0.1 Co 0.1 O 2 , NMC811)||artificial graphite (AG)+20% SiO x pouch cells. Sulfopropionic acid anhydride, which has a similar structure to 2‐SBA when excluding the benzene ring, was investigated regarding its SEI‐forming abilities by Jankowski et al.…”