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• W4312113841 abstract "Diffusion processes at the electrode/electrolyte interphase drives the performance of lithium-sulfur batteries, and activated carbon (AC) can remarkably vehicle ions and polysulfide species throughout the two-side liquid/solid region of the interphase. We reveal original findings such as the values of the diffusion coefficient at various states of charge of a Li-S battery using a highly porous AC, its notable dependence on the adopted techniques, and the correlation of the diffusion trend with the reaction mechanism. X-ray photoelectron spectroscopy (XPS) and X-ray energy dispersive spectroscopy (EDS) are used to identify in the carbon derived from bioresidues heteroatoms such as N, S, O and P, which can increase the polarity of the C framework. The transport properties are measured by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic intermittent titration technique (GITT). The study reveals Li+ -diffusion coefficient (DLi+ ) depending on the technique, and values correlated with the cell state of charge. EIS, CV, and GITT yield a DLi+ within 10-7 -10-8 cm2 s-1 , 10-8 -10-9 cm2 s-1 , and 10-6 -10-12 cm2 s-1 , respectively, dropping down at the fully discharged state and increasing upon charge. GITT allows the evaluation of DLi+ during the process and evidences the formation of low-conducting media upon discharge. The sulfur composite delivers in a Li-cell a specific capacity ranging from 1300 mAh g-1 at 0.1 C to 700 mAh g-1 at 2C with a S loading of 2 mg cm-2 , and from 1000 to 800 mAh g-1 at 0.2C when the S loading is raised to 6 mg cm-2 ." @default.
• W4312113841 created "2023-01-04" @default.
• W4312113841 creator A5004350204 @default.
• W4312113841 creator A5018359761 @default.
• W4312113841 creator A5048879727 @default.
• W4312113841 creator A5055355554 @default.
• W4312113841 creator A5071574214 @default.
• W4312113841 date "2023-02-01" @default.
• W4312113841 modified "2023-10-16" @default.
• W4312113841 title "Diffusional Features of a Lithium‐Sulfur Battery Exploiting Highly Microporous Activated Carbon" @default.
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