Two birds with one stone: engineering siloxane-based electrolytes for high-performance lithium–sulfur polyacrylonitrile batteries

Abstract

Sulfurized polyacrylonitrile (SPAN) has garnered increased interest for high-energy lithium–sulfur batteries owing to its high specific capacity and remarkable cyclic stability. However, the common electrolytes fail to stabilize both the...

Electrolyte Engineering via Fluorinated Siloxane Solvent for Achieving High-Performance Lithium-Metal Batteries

“…The relatively reduced fractions of the corresponding organic species in E-TFTMS compared to those in E-DME/FEC and CE certificate the less solvent reduction due to more AGGs in the primary solvation structure. In the F 1s and O 1s spectra, the SEI layer formed in E-TFTMS contained higher LiF (684.9 eV) and Li 2 O (528.2 eV) components in the outermost layer compared to those of in E-DME/FEC and CE, which were derived from the decomposition of FEC and self-decomposition of TFTMS. , In addition, the peaks in the O 1s spectra (531.4 eV) and Si 2p spectra (101.8 eV) jointly confirm the existence of O–Si–O species resulted from the decomposition of TFTMS during SEI formation, which is beneficial for the flexibility of SEI layer . As a comparison, more C–O signals were detected in the SEI layers formed in E-DME/FEC and CE due to the substantial decomposition of carbonate solvents, which was unable to induce uniform Li deposition.…”

“…46,47 In addition, the peaks in the O 1s spectra (531.4 eV) and Si 2p spectra (101.8 eV) jointly confirm the existence of O−Si−O species resulted from the decomposition of TFTMS during SEI formation, which is beneficial for the flexibility of SEI layer. 31 As a comparison, more C−O signals were detected in the SEI layers formed in E-DME/FEC and CE due to the substantial decomposition of carbonate solvents, which was unable to induce uniform Li deposition. From the results, the relative amount of Li-containing species at different depths is determined, as shown in Figure S12.…”

“…34 In the Si 2p spectra (Figure S18d), typical Si−O signal appeared in the CEI induced by the E-TFTMS electrolyte, which was corroborated with the Si−O peak in the O 1s spectra. 31 Besides, X-ray diffraction pattern characterizations were conducted to confirm the crystal structure of NCM811 cathodes after cycling. As shown in Figure S19, the intensity ratio of (003) and (104) of the NCM811 cathode in E-TFTMS electrolyte was much higher than that of NCM811 cathode in CE electrolyte, proving the enhanced structure stability resulted from the more protective CEI layer generated in the TFTMS-based electrolyte.…”

“…Recently, some organic silanes characterized by low viscosity and cost have been demonstrated to be ideal solvents to formulate advanced electrolytes for LMBs. − For example, Lu et al engineered a self-purifying electrolyte by dissolving 1.6 M lithium bis­(fluorosulfonyl)­imide (LiFSI) into single (2-cyanoethyl)­triethoxysilane (TEOSCN) solvent for stabilizing both the cathodes and anodes in MCMB||NMC811 full-cells . In this design, the weak interaction of Li + and TEOSCN solvent contributed to the Li + -FSI – coordination pairs, which induced an anion-derived inorganic SEI layer.…”

Composite materials based on covalent organic frameworks for multiple advanced applications

“…[83] Table 2 lists the representative applications of COFs-metal oxides in magnetic solid-phase extraction (MSPE). [101][102][103][104][105][106][107][108][109][110][111] In the above examples, most of them make use of Fe 3 O 4 as the carrier to build a magnetic COFs for MSPE. For example, Fe 3 O 4 @TbBd nanobeads as a new MSPE extractant can selectively isolate and enrich trace amounts of estrogens from human urine samples.…”