Bounded diffusion in solid solution electrode powder compacts. Part I. The interfacial impedance of a solid solution electrode (MxSSE) in contact with a m+-ion conducting electrolyte

Honders, A.; Broers, G.H.J.

doi:10.1016/0167-2738(85)90001-3

Cited by 58 publications

(14 citation statements)

References 7 publications

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“…This procedure allows the assumption of semi‐infinite conditions where c 0 , the initial concentration of lithium in the bulk of the material, is unchanged by the polarization step. [ 21,34 ] To extract the lithium diffusion coefficient assuming semi‐infinite boundary condition, the voltage relaxation measurements were interpreted using the same method as in our previous study. [ 21 ] Briefly, the open circuit potential V OC was assumed to evolve with time according to the following equation

\begin{matrix} V_{OC}^{s - i} (t) ≅ V_{0} - \frac{2}{\sqrt{π}} I Z_{normalW} ([], \sqrt{t} - \frac{t}{\sqrt{τ}}) with Z_{normalW} = \frac{W R T}{z^{2} F^{2} A c_{0} \sqrt{{\overset{D}{true}}_{Li}}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

“…For a nonstoichiometric mixed‐conducting material such as NCM, the thermodynamic factor is

W = \frac{\partial \ln (a_{Li})}{\partial \ln (c_{Li})}

and can be calculated from V 0 versus c Li data recorded during the experiment, i.e., from the lithium activity as function of the lithium concentration. [ 34,35 ] This parameter represents the activity change of lithium as a function of the state of charge of the CAM and is therefore morphology independent (Figure S2b, Supporting Information). It has to be noted that this method is only applicable for materials exhibiting a solid solution mechanism for ion (de)intercalation.…”

Section: Resultsmentioning

confidence: 99%

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Polycrystalline and Single Crystalline NCM Cathode Materials—Quantifying Particle Cracking, Active Surface Area, and Lithium Diffusion

Trevisanello

Rueß

Conforto

et al. 2021

Advanced Energy Materials

331

219

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Representatives of the LixNi1−y−zCoyMnzO2 (NCM) family of cathode active materials (CAMs) with high nickel content are becoming the CAM of choice for high performance lithium‐ion batteries. In addition to high specific capacities, these layered oxides offer high specific energy, power, and long cycle life. Recently, the development of single crystalline particles of NCM has enabled even longer lifetimes due to achieving higher Coulomb efficiencies. In this work, the performance of NCM materials with different particle size and morphology is explored in terms of key parameters such as the charge‐transfer resistance and the chemical diffusion coefficient of lithium. Cracking of secondary particles leads to liquid electrolyte infiltration in the CAM, lowering the charge‐transfer resistance and increasing the apparent diffusion coefficient by more than one order of magnitude. In contrast, these effects are not observed with single‐crystalline NCM, which is mostly free of cracks after cycling. Consequently, severe kinetic limitations are observed when cycling large “uncracked” secondary particles at low potential and capacity. These results demonstrate that cracking of polycrystalline particles of NCM is not solely detrimental but helps to achieve high reversible capacities and rate capability. Thus, optimization of CAMs size and morphology is decisive to achieve good rate capability with high‐nickel NCMs.

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\begin{matrix} V_{OC}^{s - i} (t) ≅ V_{0} - \frac{2}{\sqrt{π}} I Z_{normalW} ([], \sqrt{t} - \frac{t}{\sqrt{τ}}) with Z_{normalW} = \frac{W R T}{z^{2} F^{2} A c_{0} \sqrt{{\overset{D}{true}}_{Li}}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

“…For a nonstoichiometric mixed‐conducting material such as NCM, the thermodynamic factor is

W = \frac{\partial \ln (a_{Li})}{\partial \ln (c_{Li})}

Section: Resultsmentioning

confidence: 99%

Polycrystalline and Single Crystalline NCM Cathode Materials—Quantifying Particle Cracking, Active Surface Area, and Lithium Diffusion

Trevisanello

Rueß

Conforto

et al. 2021

Advanced Energy Materials

331

219

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show abstract

“…The Randles' equivalent circuit, while not the only possible representation, has frequently been employed to represent modified electrochemical interfaces, ,,, and in the present case provides an excellent fit of the data. The diffusion element in the Randles' equivalent circuit is represented by a generalized finite Warburg element. , …”

Section: Methodsmentioning

confidence: 99%

Preparation of Highly Impermeable Hyperbranched Polymer Thin-Film Coatings Using Dendrimers First as Building Blocks and Then as in Situ Thermosetting Agents

et al. 1999

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This report describes the synthesis, characterization, and passivation properties of durable, polyfunctional, and highly cross-linked hyperbranched dendrimer/polyanhydride composite thin films. Such films are prepared from either amine-or hydroxyl-terminated poly(amidoamine) (PAMAM) dendrimers or amine-terminated poly(iminopropane-1,3-diyl) dendrimers (64-Cascade), and the copolymer poly(maleic anhydride)-c-poly(methyl vinyl ether), Gantrez. The dendrimers serve two roles in these composite films. First, they serve as building blocks, which permeate into and covalently cross-link a chemisorbed Gantrez copolymer. Then, in a separate thermal processing step, the dendrimers form highly impermeable monolithic films. In the case of amine-terminated dendrimers, the amic acid groups that attach the dendrimers to the original Gantrez network polymer form imides. Additionally, internal β-amino groups within both the amineand hydroxyl-terminated PAMAM dendrimers undergo retro-Michael reactions. Subsequently, a combination of interdendrimer Michael reactions and interdendrimer imidization reactions leads to additional cross-links in the heated film. Before heating, the permeability of dendrimer/Gantrez composite films is pH-dependent. After heating, they become highly blocking over the pH range studied (3-11). These films have been prepared on Au, Si, and Al. When a hydrophobic octadecyl layer is attached as a final step on these composites on Al, Al is passivated against corrosion in alkaline solution or from pitting in neutral chloride-containing solution by these new materials.

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“…Before the works by Pyun et al, several other research groups [50][51][52][53][54][55][56][57][58] have discussed independently their CTs in terms of internal cell resistance. They focused on the determination of the diffusion coefficient of lithium in such electrochromic materials as and Nagai et al 50,54 tried to estimate the diffusion coefficient of lithium inside the film electrode during the bleaching and coloring processes by means of fitting CTs theoretically calculated using simplified electrode potential curves to their experimental CTs.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, Li et al [56][57][58] derived the current-time relation assuming an one-dimensional (linear) electrode potential curve to estimate the diffusion coefficient of lithium from rough comparison of the calculated CTs at various values of parameters with the experimental CTs. Finally, Honder et al [51][52][53]55 calculated the values of diffusion coefficient and total cell resistance from a combination of the approximate equations in the short time and long time ranges.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Lithium Transport through Transition Metal Oxides and Carbonaceous Materials

Shin

Pyun

Modern Aspects of Electrochemistry

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Bounded diffusion in solid solution electrode powder compacts. Part I. The interfacial impedance of a solid solution electrode (MxSSE) in contact with a m+-ion conducting electrolyte

Cited by 58 publications

References 7 publications

Polycrystalline and Single Crystalline NCM Cathode Materials—Quantifying Particle Cracking, Active Surface Area, and Lithium Diffusion

Polycrystalline and Single Crystalline NCM Cathode Materials—Quantifying Particle Cracking, Active Surface Area, and Lithium Diffusion

Preparation of Highly Impermeable Hyperbranched Polymer Thin-Film Coatings Using Dendrimers First as Building Blocks and Then as in Situ Thermosetting Agents

Mechanisms of Lithium Transport through Transition Metal Oxides and Carbonaceous Materials

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