Influence of the Si particle size on the mechanical stability of Si-based electrodes evaluated by in-operando dilatometry and acoustic emission

Tranchot, Alix; Idrissi, Hassane; Thivel, Pierre-Xavier; Roué, Lionel

doi:10.1016/j.jpowsour.2016.09.017

Cited by 48 publications

(70 citation statements)

References 43 publications

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“…Furthermore, an electrode prepared with spherical Si nanopowder (median size = 85 nm) produced by an induction plasma process also exhibits the maturation effect, see Figure S11 (Supporting Information). This shows that maturation is not dependent on the type of silicon.…”

Section: Discussionmentioning

confidence: 99%

A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si‐Based Electrodes for Li‐Ion Batteries

Hernandez

Etiemble

Douillard

et al. 2017

Advanced Energy Materials

130

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It is well known that the mechanical properties of lithium‐ion battery electrodes impact their electrochemical performance. This is especially critical for Si‐based negative electrodes, which suffer from large volume changes of the active mass upon cycling. Here, this study presents a postprocessing treatment (called maturation) that improves the mechanical and electrochemical stabilities of silicon‐based anodes made with an acidic aqueous binder. It consists of storing the electrode in a humid atmosphere for a few days before drying and cell assembly. This results in a beneficial in situ reactive modification of the interfaces within the electrode. First, the binder tends to concentrate at the silicon interparticle contacts. As a result, the cohesion of the composite film is strengthened. Second, the corrosion of the copper current collector, inducing the formation of copper carboxylate bonds, improves the adhesion of the composite film. The great improvement of the mechanical stability of the matured electrode is confirmed by in‐operando optical microscopy showing the absence of film delamination. The result is a significant electrochemical performance gain, up to a factor 10, compared to a not‐matured electrode. This maturation procedure can be applied to other types of electrodes for improving their electrochemical performance and also their handling during cell manufacturing.

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Section: Discussionmentioning

confidence: 99%

A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si‐Based Electrodes for Li‐Ion Batteries

Hernandez

Etiemble

Douillard

et al. 2017

Advanced Energy Materials

130

View full text Add to dashboard Cite

show abstract

“…The accumulation leads not only to capacity loss but also disruption of the electrical connection between the anode materials . Thus, the rate of capacity fading at the initial cycling is closely connected with the characteristics of the Si, such as the size, the crystallinity, and the specific architecture for mitigating the Si‐based failure mechanism . Sufficient graphite is crucial for reducing the interparticle electrical resistance, despite the associated loss of specific capacity, otherwise the capacity fading would be accelerated, like with the Si electrode in which graphite is not blended …”

Section: Critical Factors For the Combination Of Graphite And Simentioning

confidence: 99%

Integration of Graphite and Silicon Anodes for the Commercialization of High‐Energy Lithium‐Ion Batteries

et al. 2019

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Silicon is considered a most promising anode material for overcoming the theoretical capacity limit of carbonaceous anodes. The use of nanomethods has led to significant progress being made with Si anodes to address the severe volume change during (de)lithiation. However, less progress has been made in the practical application of Si anodes in commercial lithium‐ion batteries (LIBs). The drastic increase in the energy demands of diverse industries has led to the co‐utilization of Si and graphite resurfacing as a commercially viable method for realizing high energy. Herein, we highlight the necessity for the co‐utilization of graphite and Si for commercialization and discuss the development of graphite/Si anodes. Representative Si anodes used in graphite‐blended electrodes are covered and a variety of strategies for building graphite/Si composites are organized according to their synthetic methods. The criteria for the co‐utilization of graphite and Si are systematically presented. Finally, we provide suggestions for the commercialization of graphite/Si combinations.

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“…It seems that a particle size of 12 µm achieves an optimal external surface area (0.9 m 2 /g, Table S4 (Supplementary Information)) in relation to the binders of CMC and PAA utilized in the electrodes. It has been reported recently that the interaction between the particles and the binder materials is critical regarding the capacity retention 16 . Another thing to consider is the thickness of the electrode.…”

Section: Resultsmentioning

confidence: 99%

Electrochemically anodized porous silicon: Towards simple and affordable anode material for Li-ion batteries

Ikonen

Nissinen

Pohjalainen

et al. 2017

Sci Rep

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Silicon is being increasingly studied as the next-generation anode material for Li-ion batteries because of its ten times higher gravimetric capacity compared with the widely-used graphite. While nanoparticles and other nanostructured silicon materials often exhibit good cyclability, their volumetric capacity tends to be worse or similar than that of graphite. Furthermore, these materials are commonly complicated and expensive to produce. An effortless way to produce nanostructured silicon is electrochemical anodization. However, there is no systematic study how various material properties affect its performance in LIBs. In the present study, the effects of particle size, surface passivation and boron doping degree were evaluated for the mesoporous silicon with relatively low porosity of 50%. This porosity value was estimated to be the lowest value for the silicon material that still can accommodate the substantial volume change during the charge/discharge cycling. The optimal particle size was between 10–20 µm, the carbide layer enhanced the rate capability by improving the lithiation kinetics, and higher levels of boron doping were beneficial for obtaining higher specific capacity at lower rates. Comparison of pristine and cycled electrodes revealed the loss of electrical contact and electrolyte decay to be the major contributors to the capacity decay.

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Influence of the Si particle size on the mechanical stability of Si-based electrodes evaluated by in-operando dilatometry and acoustic emission

Cited by 48 publications

References 43 publications

A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si‐Based Electrodes for Li‐Ion Batteries

A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si‐Based Electrodes for Li‐Ion Batteries

Integration of Graphite and Silicon Anodes for the Commercialization of High‐Energy Lithium‐Ion Batteries

Electrochemically anodized porous silicon: Towards simple and affordable anode material for Li-ion batteries

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