A Sulfur‐layered Separator Enabling an Innovative Flexible Li<b></b>S Battery without Integrating Elemental Sulfur in the Cathode

Intramolecular cyclization of 1,1‐diisopropyl‐ or diphenyl‐bis(phenylethynyl)‐silanes (2a and 2b) followed by bromination or trimethylsilylation were carried out to yield 1,1‐diisopropyl‐ or ‐diphenyl‐3,4‐diphenyl‐2,5‐dibromo‐siloles (3a and 3b) and 1,1‐diisoproyl‐ or ‐diphenyl‐3,4‐diphenyl‐2,5‐bis(trimethylsilyl)‐siloles (4a and 4b), respectively. The structures of 3a,b and 4a,b were confirmed using 1H, 13C, and 29Si NMR as well as FTIR spectroscopy. The absorption bands of the siloles 3a,b and 4a,b in THF were measured at 303–325 nm with the molar absorptivities of 1.85 × 103 ~ 2.18 × 103 cm−1·M−1. The excitation bands were measured at 347–376 nm and the emission peaks were measured at 409–445 nm. Cyclic voltammograms of 3a and 3b indicated oxidation peaks at 0.90 and 0.80 V and reduction peaks at −1.20 and −1.20 V, respectively. The cyclic voltammograms of 4a and 4b indicated two oxidation peaks between −0.05 and −0.95 V and two reduction peaks between −0.10 and −0.93 V, respectively. Compound 4a exhibits a better long cycle performance by almost 1000 cycles as compared that of 3a and 4b. The rate performance test of the anodes Li‐3a and Li‐4a exhibited better performance properties at various C rate than Li‐4b. According to discharge–charge curves, 4a shows one plateau at approximately 0.58 V of the first discharge curve and the initial discharge specific capacity of 972 mAh/g. The electrochemical impedance spectroscopy of 4a indicates low charge transfer resistance, good conductivity of the electrolyte, and fast chemical adsorption/desorption rate of electrolyte ions on electrode surface, due to the electronic structure of 4a.

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Synthesis of 1,1‐Diisopropyl‐ or ‐Diphenyl ‐2,5‐dibromo‐ or ‐bis(trimethylsilyl)‐3,4‐diphenyl‐siloles and the Electrochemical Properties as Anode Materials for Lithium‐Ion Battery

Cho

Jung

Park

2020

Bulletin Korean Chem Soc

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Synthesis and electrochemical characteristics of oligo[{3,4‐diphenyl‐1,1‐di(propan‐2‐yl)‐2,5‐silolene}‐co‐(diphenylsilylene)] for lithium‐ion secondary battery anodes

Jung

Park

2021

Bulletin Korean Chem Soc

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The co-oligomerization of 2,5-dibromo-3,4-diphenyl-1,1-di(propan-2-yl)-silole (3) with dichlorodiphenylsilane was carried out using n-butyllithium at À78 C to synthesize oligo[{3,4-diphenyl-1,1-di(propan-2-yl)-2,5-silolene}-co-(diphenylsilylene)] ( 5) as yellowish-white powder, with a mass-average molar mass of 561, polydispersity of 1.01, λ abs,max of 260 and 279 nm, λ ex,max of 296 nm, λ em,max of 391 nm, and thermal stability up to 125 C without any weight loss. The rate performance obtained with oligomer 5 was superior to that obtained with monomer 3. The discharge and charge capacities with 5 were 1234 and 1263 mAhg À1 , respectively, with Coulombic efficiency of 97.7% at the 100th cycle. Nyquist plots suggested that the resistance decreases gradually with repeated cycling.

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Development of nickel‐based cable batteries with carbon nanotube and polytetrafluoroethylene enhanced flexible electrodes

et al. 2020

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Summary The fabrication of flexible nickel‐based cable batteries is presented. Different fabrication methods, as well as formulations, were studied. It was found that iron anodes were more suitable than zinc electrodes for the helix design used in the cable/rope‐shaped cells, possibly due to their higher stability in the alkaline environment. Furthermore, the addition of a thin polytetrafluoroethylene (PTFE) layer to the electrodes enhanced their mechanical stability, making them more durable and stable when twisted into helixes during cell assembly and packaging. A single‐step precipitation reaction was used to load iron oxides directly onto carbon nanotubes, which promoted contact between iron/iron oxide particles and conductive additives and thus improved the discharge capacity of the batteries. After optimizations, the typical iron anode showed initial specific capacity higher than 90 mAh g−1, though it decreased to around 60 mAh g−1 and remained more stable as cycles continued. The cable cells also remained functional and showed consistent performance under bent conditions.

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A Sulfur‐layered Separator Enabling an Innovative Flexible LiS Battery without Integrating Elemental Sulfur in the Cathode

Cited by 4 publications

References 23 publications

Synthesis of 1,1‐Diisopropyl‐ or ‐Diphenyl ‐2,5‐dibromo‐ or ‐bis(trimethylsilyl)‐3,4‐diphenyl‐siloles and the Electrochemical Properties as Anode Materials for Lithium‐Ion Battery

Synthesis of 1,1‐Diisopropyl‐ or ‐Diphenyl ‐2,5‐dibromo‐ or ‐bis(trimethylsilyl)‐3,4‐diphenyl‐siloles and the Electrochemical Properties as Anode Materials for Lithium‐Ion Battery

Synthesis and electrochemical characteristics of oligo[{3,4‐diphenyl‐1,1‐di(propan‐2‐yl)‐2,5‐silolene}‐co‐(diphenylsilylene)] for lithium‐ion secondary battery anodes

Development of nickel‐based cable batteries with carbon nanotube and polytetrafluoroethylene enhanced flexible electrodes

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