Eric De Vito

Eric De Vito
Atomic Energy and Alternative Energies Commission, Grenoble, France · Institute for New Energy Technologies

30.54
 · 
PhD

About

48
Publications
12,584
Reads
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871
Citations
Research Experience
January 2007 - present
Atomic Energy and Alternative Energies Commission
Position
  • Senior Researcher

Publications

Publications (48)
Article
Replacing the CdS buffer layer with a ZnSnO one in Cu2ZnSnS4-based solar cells allows both to improve the device performances and to avoid using toxic Cd. Additionally, using a sputtered buffer layer is a major asset for solar cells fabricated by physical vapor deposition processes. In this study, ZnSnO layers are deposited by sputtering of a singl...
Article
Failure mechanisms associated with silicon-based anodes are limiting the implementation of high-capacity lithium-ion batteries. Understanding the aging mechanism that deteriorates the anode performance and introducing novel-architectured composites offer new possibilities for improving the functionality of the electrodes. Here, the characterization...
Article
The understanding of the phenomena occurring during water immersion of LiNi0.5Mn0.3Co0.2O2 (NMC) is helpful to devise new strategies towards the implementation of aqueous processing of this high capacity cathode material. Immersion of NMC powder in water leads to both structural modification of the particles surface as observed by HRSTEM, and forma...
Article
Cu2ZnSnS4‐based solar cells suffer from limited power conversion efficiency (PCE) and relative small grain size compared to selenium containing absorbers. Introduction of Na in Cu2ZnSnS4 absorbers either during the synthesis or after this step is used to improve device performances and to determine whether its effect is based on structural properti...
Article
One of the root causes for the limited lifetime or the restricted high power performance of the lead-acid batteries is the corrosion of the positive current collectors. These barriers can be overcome using titanium as an attractive alternative of the lead and the lead alloy grids, due to a combination of excellent mechanical strength, corrosion res...
Article
The sustainability through the energy and environmental costs involve the development of new cathode materials in considering the materials abundance, the toxicity and the end of life. Currently, some synthesis methods of new cathode materials and a large majority of recycling processes are based on acidic solutions use. This study addresses the me...
Article
Among the candidates as negative electrode, silicon is now one of the most attractive alternatives to graphite and has been the subject of many investigations for the last decade. The commercialization of Si electrodes is nevertheless blocked by the inability to overcome the mechanical degradation and electrolyte consumption occurring as a result o...
Article
Full-text available
This paper deals with the occurrence of a graphite irreversible degradation mechanism in commercial Graphite (C) / lithium Nickel Manganese Cobalt oxide (NMC) lithium-ion batteries, challenging metallic lithium deposition as the major aging mechanism at low temperature cycling. In this study, commercial 16 Ah C/NMC Li-ion cells were aged during cyc...
Article
Full-text available
Succinic anhydride (SA) is an useful electrolyte additive for high voltage cathodes but has also a negative impact on graphite (Gr) or Li anodes. For this reason, the Li/electrolyte and Gr/electrolyte interfaces were investigated at 20°C and 45°C using half or symmetrical cells. When SA is added at 1% by weight to the electrolyte (alkylcarbonate mi...
Article
Full-text available
Core-shell silicon-carbon nanoparticles are attractive candidates as active material to increase the capacity of Li-ion batteries while mitigating the detrimental effects of volume expansion upon lithiation. However crystalline silicon suffers from amorphization upon the first charge/discharge cycle and improved stability is expected in starting wi...
Article
Full-text available
The failure mechanism of silicon-based electrodes has been studied only in a half-cell configuration so far. Here, a combination of 7Li, 19F MAS NMR, XPS, TOF-SIMS and STEM-EELS, provides an in-depth characterization of the Solid Electrolyte Interphase (SEI) formation on the surface of silicon and its evolution upon aging and cycling with LiNi1/3Mn...
Article
Considering its specific capacity, silicon is one of the most promising materials to replace graphite in lithium ion batteries anodes. However its rapid capacity fading prevents its use in current batteries. Understanding lithiation and degradation mechanisms of silicon is important for improving its cyclability. In this work a novel approach is de...
Article
Full-text available
Improvement of life-time is an important issue in the development of Li-ion batteries. Aging mechanisms limiting the life-time can efficiently be characterized by physico-chemical analysis of aged cells with a variety of complementary methods. This study reviews the state-of-the-art literature on Post-Mortem analysis of Li-ion cells, including disa...
Article
Silicon is a serious candidate to replace graphite in electrodes since it offers a specific capacity almost ten times higher than carbonaceous materials. However, cycling performances of Si electrodes remain very limited, due to huge volume changes upon alloying and de-alloying with lithium. A fine understanding of the lithiation mechanism of silic...
Research
Full-text available
Al-rich coatings on 1.4914 martensitic steel, produced by different techniques, have been investigated with optical and scanning electron microscopy, X-ray fluorescence and X-ray photoelectron spectroscopy. Tests for their Pb-17Li compatibility and thermo cycling behaviours have been performed on some coated specimens. Up to now, none of the invest...
Article
Full-text available
Carbon covered silicon nanoparticles (Si@C) were synthesized for the first time by a one-step continuous process in a novel two stages laser pyrolysis reactor. Crystallized silicon cores formed in the first stage were covered in the second stage by a continuous shell mainly consisting in low organized sp² carbon. At the Si/C interface silicon carbi...
Article
A pluri-disciplinary approach and a combination of techniques are used here to finely describe the surface of silicon nanoparticles used as active material in negative composite electrodes for lithium batteries. Although the surface of silicon particles is playing a major role in the electrochemical performance, it has rarely been characterized in...
Article
a With a specific capacity of 3600 mA h g À1 , silicon is a promising anode active material for Li-ion batteries (LIBs). However, because of the huge volume changes undergone by Si particles upon (de)alloying with lithium, Si electrodes suffer from rapid capacity fading. A deep understanding of the associated failure mechanisms is necessary to impr...
Article
Full-text available
In this paper, the surface of composite electrodes made of nano-silicon is studied by using two surface characterization techniques: X-ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES). Several electrodes were analyzed at different States Of Charge (SOC) during the first electrochemical cycle. Firstly, the Solid Electrolyte...
Article
Full-text available
Binary mixtures of cyclic (TMS) or acyclic sulfones (MIS, EIS and EMS) with EMC or DMC have been used in electrolytes containing LiPF6 (1 M) in both Li4Ti5O12/Li half-cells and Li4+xTi5O12/Li4Ti5O12 symmetric cells and compared with standard EC/EMC or EC/DMC mixtures. In half-cells, sulfone-based electrolytes cannot be satisfactorily cycled owing t...
Article
Full-text available
Cycling after storage of LiNi0.4Mn1.6O4/Li4Ti5O12 cells evidences lower total capacity losses for EMS-, TMS- and MIS-based electrolytes as compared to EC-based at 20 °C. The shuttle-type mechanism induced by the electrolyte oxidation is mainly present in the accumulators at this temperature, as compared to those due to the Mn(2+) and Ni(2+) dissolu...
Conference Paper
Full-text available
Binary mixtures of cyclic or acyclic sulfones with EMC or DMC are used in electrolytes containing LiPF6 (1M) in both Li4Ti5O12/Li half-cells and Li4+xTi5O12/Li4Ti5O12 symmetric cells and compared with standard EC/EMC or EC/DMC mixtures. In half-cells, sulfone-based electrolytes cannot be satisfactorily cycled owing to the formation of a resistive l...
Article
Full-text available
Despite many studies, silicon lithiation mechanisms remain unclear. Si amorphization induced by lithium insertion hinders the use of standard techniques of characterization such as diffraction. In this paper, electrochemical silicon lithiation is investigated by using a technique of surface characterization, Auger Electron Spectroscopy (AES). The f...
Article
Full-text available
The capabilities of nano-Auger were assessed for the characterization of SiGe multilayers epitaxially grown on Si(001) wafers. Reference sample consisting in stack of (300-500)-nm thick SiGe layers with a Ge content increasing in discrete steps from 6 to 30 % (as determined by X-ray diffraction) were used to that end. Composition measurements were...
Article
The present study demonstrates the growth of silicon nanocrystals on amorphous silicon carbide alloy thin films. Amorphous silicon carbide films [a-Si1 − xCx:H (with x < 0.3)] were obtained by plasma enhanced chemical vapor deposition from a mixture of silane and methane diluted in hydrogen. The effect of varying the precursor gas-flow ratio on the...
Article
Full-text available
We study the growth of silicon nanowires (SiNWs) by chemical vapor deposition (CVD) with aluminum as catalyst. We show that for a growth temperature of 600 °C, the silicon precursor partial pressure (SiH4 in this study) is a key parameter for controlling the structural quality of the resulting SiNWs. We find by transmission electron microscopy that...
Article
Organic thin-film transistor (OTFT) performance depends on the chemical characteristics of the interface between functional semiconductor/dielectric/conductor materials. Here we report for the first time that OTFT response in top-gate architectures strongly depends on the substrate chemical functionalization. Depending on the nature of the substrat...
Article
Full-text available
The catalytic growth of carbon nanotubes is performed at 580 °C with iron catalyst using a hot-wall CVD technique. It is shown that the growth mode can be switched from ‘tip’ to ‘base’ growth mode by an insertion of plasma pre-treatment of catalyst at room temperature before growth. To understand this phenomenon, the oxidation state of catalyst is...
Article
Full-text available
An analytic model of deposition is applied on reactive ion beam sputtering to optimize the properties of iron oxide thin films. This model will be able to predict deposition rate and phase contents. Among its hypotheses, we assume oxygen adsorption at the surface of the target to explain variations of deposition rate for oxygen flow. This hypothesi...
Article
Full-text available
In this paper, we present experimental results on the preparation and the electrochemical characterization of PtxCoy electrocatalytic particles with homogeneous composition, modeled by Franco et al. [J. Electrochem. Soc., 156, B410 (2009)]. Preparation is made through the direct liquid injection metallorganic chemical vapor deposition technique pre...
Article
This paper presents our investigations to find an industrial route to clean copper alloy and stainless steel in order to manufacture high-strength joints for ITER Primary First Wall panels. Products investigated are chemical liquids, and a more advanced technique that uses a plasma process is also investigated. HIP joints have been tested by perfor...
Article
Bipolar plate represents a key component of Proton Exchange Membrane Fuel Cell (PEFC) with several essential functions, among them the electric connection of elementary cells. Usually made of graphite, this component is studied worldwide in order to develop a commercially viable alternative: different ways have been being investigated, and to date,...
Article
Full-text available
In this article, we focus on the understanding of the PtxCoy electrocatalysts degradation in polymer electrolyte fuel Cell (PEFC) environments. A multiscale atomistic/kinetic model is derived providing mechanistic insights on the impact of the nanostructure and operating conditions on PtxCoy nanoparticles durability. On the basis of ab initio (Al)...
Article
Full-text available
In this paper we focus on the understanding of the PtxCoy catalysts degradation in PEFC environments. A multiscale atomistic/kinetic model is derived providing new mechanistic insights on the impact of clusters nanostructure and operating conditions on PtxCoy materials durability. On the basis of ab initio (AI) data, we identify favorable pathways...
Article
Be has a tendency to form particularly brittle intermetallics with Cu and a lot of other elements. Insertion of interlayers may be a solution to increase bond quality. Ion Beam Analysis (IBA) methods have been considered together with scanning electron microscopy (SEM) and electron back-scattering diffraction (EBSD) as complementary techniques for...
Article
Full-text available
SOFCs can be operated with biosyngas, but this fuel contains inorganic species, which act as contaminants for SOFCs. One of the most active is H2S, but salts like KCl can also affect SOFCs. Experiments have been performed to evaluate the interaction between SOFC anode material and these species. A synthetic gas representative of biosyngas containin...
Article
Full-text available
Increasing lifetime while maintaining performance is of major interest in the challenge for PEMFC development. One promising way when using metallic bipolar plates is to find a compromise between passivity and electrical contact resistance of the passive films formed on stainless steel. A specific test facility and testing procedure have been devel...
Article
Full-text available
Austenitic stainless steels (Fe–19Cr–10Ni (at.%)) have been implanted with molybdenum ions (Mo+, 100 keV, 2.5 × 1016 atoms cm−2). The implanted material has been characterized by XPS and RBS. The implanted region has a thickness of ∼1000 Å with a maximum molybdenum concentration of ∼9 at.% Mo located at ∼210 Å from the surface. The effects of impla...

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Projects

Projects (4)
Project
http://project-baccara.eu/