2021
DOI: 10.1021/acsami.1c19969
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Antioxidation Mechanism of Highly Concentrated Electrolytes at High Voltage

Abstract: It has been researched that highly concentrated electrolytes (HCEs) can solve the problem of the excessive decomposition of dilute electrolytes at a high voltage, but the mechanism is not clear. In this work, the antioxidation mechanism of HCE at a high voltage was investigated by in situ electrochemical tests and theoretical calculations from the perspective of the solvation structure and physicochemical property. The results indicate that compared with the dilute electrolyte, the change of solvation structur… Show more

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Cited by 27 publications
(25 citation statements)
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“…In addition, the graphite has separated from the copper foil current collector in cross-sectional characterization, caused by the cointercalation of Li + -TMP into graphite. We find, quite interestingly, the graphite surface is dense in Li|1.5 M without TMP|graphite (Figure c,d), which helps to effectively inhibit the negative side reactions . This indicates that the SEI film derived from DFOB – is a feasible strategy to improve the interfacial stability.…”
Section: Resultsmentioning
confidence: 75%
See 1 more Smart Citation
“…In addition, the graphite has separated from the copper foil current collector in cross-sectional characterization, caused by the cointercalation of Li + -TMP into graphite. We find, quite interestingly, the graphite surface is dense in Li|1.5 M without TMP|graphite (Figure c,d), which helps to effectively inhibit the negative side reactions . This indicates that the SEI film derived from DFOB – is a feasible strategy to improve the interfacial stability.…”
Section: Resultsmentioning
confidence: 75%
“…We find, quite interestingly, the graphite surface is dense in Li|1.5 M without TMP|graphite (Figure 5c,d), which helps to effectively inhibit the negative side reactions. 30 This indicates that the SEI film derived from DFOB − is a feasible strategy to improve the interfacial stability. The SEM image of the reassembled Li|0.7 M with 40%TMP|graphite@SEI cell in Figure 5e,f, as expected, shows a similar SEI film with the one in the Li|1.5 M without TMP|graphite cell, which is much thinner and denser than that in the Li|0.7 M with 40%TMP|graphite cell.…”
Section: ■ Results and Discussionmentioning
confidence: 98%
“…As shown in the O 1s spectrum in Figure c, five peaks are observed at 529.5, 530.5.2, 531.1, 532.1, and 533.1 eV, which are fitted by O–Ti–O, Ti–O, C–O–Ti, and O in chemisorbed water H 2 O and O in hydroxyl OH – . The O 1s peak at 534.9 eV is generally ascribed to the Na–O bond as well as the oxygen bond associated with carbonaceous materials . Also, the C 1s spectra in Figure d can be fitted to the peaks at 283.5, 284.4, 285.2, 285.7, 286.6, and 288.9 eV, corresponding to C–O–Ti, C–C, CC, C–O, CO, and O–CO bonds, respectively . In summary, both C 1s and O 1s confirm the existence of a C–O–Ti bond in the Na 2 Ti 3 O 7 @C composite electrode.…”
Section: Resultsmentioning
confidence: 90%
“…As the salt concentration increases, the oxidation potential of the anion decreases, and more inorganic interfacial films are formed on the cathode interface. [ 89 ] In addition, high‐concentration electrolytes are flame retardant better than conventional electrolytes, which meets safety requirements. [ 90 ] By increasing the concentration of LiFSI to 10 m , Fan et al not only achieved high Coulombic efficiency of stripping/intercalating lithium on the Cu electrode, but also successfully maintained the capacity of 86% of the original capacity on the 4.6 V NCM622 || Li‐battery after 100 cycles.…”
Section: Different Electrolyte Modification Strategies Improve High‐v...mentioning
confidence: 99%