Liquid electrolyte chemistries for solid electrolyte interphase construction on silicon and lithium-metal anodes

Abstract

Next-generation battery development necessitates the coevolution of liquid electrolyte and electrode chemistries, as their erroneous combinations lead to battery failure. In this regard, priority should be given to the alleviation...

Advancing high‐performance one‐dimensional Si/carbon anodes: Current status and challenges

“…Furthermore, the development of nano‐composite materials incorporating Si with other elements or compounds, like Si oxide [ 15 ] or siloxanes, [ 16 ] demonstrates the potential for improving cycling performance and capacity retention. In addition, modifying the electrolyte composition, [ 17 ] additives, [ 18 ] or employing solid‐state electrolytes [ 19 ] optimizes Si anode performance by stabilizing solid–electrolyte interface (SEI) and minimizing side reactions. Particularly, precision electrode design, featuring controlled architectures, such as porous structures or hierarchical arrangements (Figure 1), can effectively accommodate volume changes and enhance overall performance.…”

Compositionally Sequenced Interfacial Layers for High‐Energy Li‐Metal Batteries

“…LiF‐enriched inner SEIs driven by TFOFE exhibit several unique properties, including electronic insulation, high mechanical strength, and a wide electrochemical stability window. [ 42 , 43 ] The organic‐species‐containing inner layer and P–O‐species‐based middle layer of the as‐synthesized multilayer SEI facilitated Li + transport across the SEI owing to their low compactness and electronegativity. Moreover, the construction of a polymeric outer SEI layer by VC and LiNO 3 upon repetitive Li plating/stripping compensated for the insufficient mechanical integrity of the organic‐species‐containing inner SEI layer.…”

Designing Electrolytes for Stable Operation of High-Voltage LiCoO2 in Lithium-Ion Batteries

“…13,14 However, such solvents cannot be used universally because they are expensive, have high density, and are toxic to the environment. 15 Some of the latest studies have mainly used LiCoO 2 cathodes with a low mass loading (<20 mg cm −2 or 4 mAh cm −2 ). 14,16,17 Lithium hexafluorophosphate (LiPF 6 ) is widely used as an ion source in commercial LIB electrolytes because of its high ionic conductivity, good oxidation stability, and compatibility with Al current collectors.…”

“…In addition, lattice oxygen released from the LiCoO 2 cathode causes an irreversible transition from the layered to the rock-salt phase. , To circumvent these problematic behaviors, it is essential to build a high-quality cathode–electrolyte interface (CEI) that can mitigate the parasitic reactions between the electrolyte and the LiCoO 2 cathode and formulate an electrolyte that can endure high-voltage operations. Many recent reports have focused on improving the oxidation stability of the electrolyte by using fluorinated solvents. , However, such solvents cannot be used universally because they are expensive, have high density, and are toxic to the environment . Some of the latest studies have mainly used LiCoO 2 cathodes with a low mass loading (<20 mg cm –2 or 4 mAh cm –2 ). ,, Lithium hexafluorophosphate (LiPF 6 ) is widely used as an ion source in commercial LIB electrolytes because of its high ionic conductivity, good oxidation stability, and compatibility with Al current collectors. − However, LiPF 6 can react with trace amounts of water typically found in cells, inducing the generation of innumerable corrosive compounds such as PF 5 and HF. , These compounds aggravate solvent decomposition and impair the electrode–electrolyte interface.…”

“…Therefore, a conspicuous LiF-based SEI was designed by decomposing LiFMDFB and FEC (Figures S3c and S19). The LiF-based SEI acts as an electronic insulator because of its high band gap (8.9 eV) and affords high mechanical strength to the cell (55.6 GPa) . In addition, it has a wide electrochemical stability window (0–6.4 V vs Li/Li + ) and low solubility in the electrolyte, making it essential for long-term cyclability.…”