DTEEP: dinâmicas e trocas entre estados de performance

Peled, Yiftah

doi:10.11606/t.27.2013.tde-14022014-112246

Cited by 4 publications

(4 citation statements)

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“…This is known as a Solid Electrolyte Interphase (SEI) layer -a common feature in Li-ion battery technology. 52 Fortunately, there was large volume of literature on additives that have been used to chemically engineer the properties of this layer, including the thickness. 53,54 Upon screening, tris(pyrrolidino)phosphoramide (TPPA) was found to be exceptionally good at tempering the thickness of the SEI and promoting product formation.…”

Section: Deeply Reducing Electrochemistry: Birch-type Reductions Made Simplementioning

confidence: 99%

A Survival Guide for the “Electro-curious”

et al. 2019

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The appeal and promise of synthetic organic electrochemistry have been appreciated over the past century. Indeed, many of the largest industrial synthetic chemical processes are achieved in a practical way using electrons as a reagent. Why then, after so many years of the documented benefits of electrochemistry, is it not more widely embraced by mainstream practitioners? Erroneous perceptions that electrochemistry is a "black box" combined with a lack of intuitive and inexpensive standardized equipment likely contributed to this stagnation in interest within the synthetic organic community. This barrier to entry is magnified by the fact that many redox processes can already be accomplished using simple chemical reagents even if they are less atomeconomic. Time has proven that sustainability and economics are not strong enough driving forces for the adoption of electrochemical techniques within the broader community. The unique reactivity benefits of this old redox-modulating technique must therefore be highlighted and leveraged in order to draw organic chemists into the field. Enabling new bonds to be forged with higher levels of chemo-and regioselectivity will likely accomplish this goal. In doing so, it is envisioned that widespread adoption of electrochemistry will go beyond supplanting unsustainable reagents in mundane redox reactions to the development of exciting reactivity paradigms that enable heretofore unimagined retrosynthetic pathways. Whereas the rigorous physical organic chemical principles of electroorganic synthesis have been reviewed elsewhere, it is often the case that such summaries leave out the pragmatic aspects of designing, optimizing, and scaling up preparative electrochemical reactions. Taken together, the task of setting up an electrochemical reaction, much less inventing a new one, can be vexing for even seasoned organic chemists. This Account therefore features a unique format that focuses on addressing this exact issue within the context of our own studies. The graphically rich presentation style pinpoints basic concepts, typical challenges, and key insights for those "electro-curious" chemists who seek to rapidly explore the power of electrochemistry in their research.

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Section: Deeply Reducing Electrochemistry: Birch-type Reductions Made Simplementioning

confidence: 99%

A Survival Guide for the “Electro-curious”

et al. 2019

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“…As such, control of the SEI’s formation has important implications in the safety, irreversible capacity loss, energy density, and cost of a battery . Typically, the SEI is formed during the initial charging of a battery, and when formed, it protects the anode from reacting with the electrolyte, while allowing Li ions to migrate to and from the anode . During this initial charging, three general reactions occur as depicted in Figure 1a: electrochemical reduction of electrolyte (Rxn 1), Li intercalation (Rxn 2), and reduction of electrolyte by intercalated Li (Rxn 3).…”

Section: Introductionmentioning

confidence: 99%

Structure of Spontaneously Formed Solid-Electrolyte Interphase on Lithiated Graphite Determined Using Small-Angle Neutron Scattering

et al. 2015

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We address the reactivity of lithiated graphite−anode material for Li-ion batteries with standard organic solvents used in batteries (ethylene carbonate and dimethyl carbonate) by following changes in neutron scattering signals. The reaction produces a nanosized layer, the solid-electrolyte interphase (SEI), on the graphite particles. We probe the structure and chemistry of the SEI using small-angle neutron scattering (SANS) and inelastic neutron scattering. The SANS results show that the SEI fills 20−30 nm sized pores, and inelastic scattering experiments with H/D substitution show that this "chemical" SEI is primarily organic in nature; that is, it contains a large amount of hydrogen. The graphite−SEI particles show surface fractal scattering characteristic of a rough particle−void interface and are interconnected. The observed changes in the SEI structure and composition provide new insight into SEI formation. The chemically formed SEI is complementary and simpler in composition to the electrochemically formed SEI, which involves a number of different reactions and products that are difficult to deconvolute.

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“…Copper, deposited onto a Ti adhesion layer on a single-crystal Si substrate, was chosen as working electrode as it does not intercalate lithium, and thus all electrochemical charge is attributed to decomposition of the electrolyte to form the SEI layer. Copper is frequently used as an “ideal” electrode for SEI studies, ,− and it has been established that films grown on nonintercalating substrates are similar to those grown on carbon materials at low potentials in Li salts. , Aurbach et al have also shown that the thermodynamics of reduction processes of the electrolyte solution species are governed by the cation used . The electrolyte consisted of 1 mol/L LiPF 6 in a 1:2 (v/v) ratio of deuterated ethylene carbonate, EC, and diethyl carbonate, DEC.…”

Section: Introductionmentioning

confidence: 99%

Solid Electrolyte Interphase in Li-Ion Batteries: Evolving Structures Measured In situ by Neutron Reflectometry

et al. 2012

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The total accumulated charge collected from test points b-i can be viewed as Supplemental Figure 1. As such, the charge per unit area in test point b represents only the charge collected at b; each successive test point contains the sum of charge collected at all previous test points in addition to the current test point.Supporting Figure 1: Charge Accumulation as a function of test point. Ex Situ Characterization of the SEI Layer: Sample PreparationUpon completion of in situ testing and associated radiation screening (approximately 60 days after NR experiments), cells were disassembled in a glovebox with atmospheric specifications as stated in the methods section. The working electrodes with SEI were rinsed with diethyl carbonate, DEC, and dried.

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DTEEP: dinâmicas e trocas entre estados de performance

Cited by 4 publications

References 0 publications

A Survival Guide for the “Electro-curious”

A Survival Guide for the “Electro-curious”

Structure of Spontaneously Formed Solid-Electrolyte Interphase on Lithiated Graphite Determined Using Small-Angle Neutron Scattering

Solid Electrolyte Interphase in Li-Ion Batteries: Evolving Structures Measured In situ by Neutron Reflectometry

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