A film maturation process for improving the cycle life of Si-based anodes for Li-ion batteries

Hernandez, Cuauhtémoc Reale; Karkar, Zouina; Guyomard, Dominique; Lestriez, Bernard; Roué, Lionel

doi:10.1016/j.elecom.2015.10.014

Cited by 20 publications

(17 citation statements)

References 15 publications

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“…[35,36] The drying step plays a critical role as the free binder remaining in the solvent can migrate with the solvent toward the top surface of the electrode film. [42] For silicon-based electrodes made with an acidic aqueous binder system, we show here that maturation has a double beneficial effect. [38,39] A lower tendency to segregation is seen for high molecular weight binder, as a consequence of multiple binding to the particles.…”

Section: Introductionmentioning

confidence: 67%

“…[42] According to theoretical models for the cracking behavior of thin coatings, the spacing between cracks (size of islands) usually depends on how the crack is initially formed. The islands of the matured electrode have a diameter of about 100 µm, whereas for the standard one, they are about 200 µm or more.…”

Section: In Operando Microscopymentioning

confidence: 99%

“…The image segmentation procedure does not permit to differentiate the SEI products from CB and the binder. [42,43] In addition, the SEI layer thickness around the Si particles can be evaluated in a first approximation as the difference between the Si-free solid phase size after and before cycling ( Figure S9b, Supporting Information).…”

Section: Fib/sem Tomographymentioning

confidence: 99%

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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: Introductionmentioning

confidence: 67%

Section: In Operando Microscopymentioning

confidence: 99%

Section: Fib/sem Tomographymentioning

confidence: 99%

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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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“…[27][28][29] Compared with PVDF, CMC binder can better bond on the surface of Si particles to form of a stable SEI 30 and inhibit capacity fading for side reactions with the electrolyte 31 leading to enhanced cycle life (even 5 times). 32 In some deep studies, the degree of substitution on the CMC molecule 33 and the pH of the electrode slurry [34][35][36][37][38][39] also played a crucial role on performances. CMC binders can form strong interaction leading to improved performances compared with PVDF with week Van der Waals force.…”

Section: Cellulose-type Bindermentioning

confidence: 99%

The progress of novel binder as a non-ignorable part to improve the performance of Si-based anodes for Li-ion batteries

Huang

Ren²,

Liu

et al. 2017

Int J Energy Res

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Summary In this review, we highlight recent achievements of polymer binders used for Si‐based anodes in Li‐ion batteries. We classify the polymer binders, depending on their polymer structures and the function on performances of Si‐based anodes, into 3 types: cellulose‐type, conductive‐type and self‐healing‐type binders. The relationship between polymer structures and enhanced electrochemical performances of Si‐based anodes is discussed in details. We investigate how the binders make an extraordinary improvement on the specific capacity, cycling stability and rate performances of Si‐based anodes. The reasons of the noticeable effect on Si‐based anodes especially the controlling of swelling during cycling are also researched. In a word, the main aim of this review is to analyze recent research achievements and propose perspectives of polymer binders used for Si‐based anodes in promising Li‐ion batteries.

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“…Because of their low swellability in carbonate-based electrolytes and resiliency, they are more effective in maintaining the electrode morphology and providing a stable electrode-electrolyte interface than the established poly(vinylidene difluoride) (PVdF) binder and its derivatives [26,34,39]. Unfortunately, the overall electrode performance strongly depends on the surface of the silicon particles as a result of different synthetic routes, pretreatments [25,28] or slurry fabrication [40], making comparisons between reported binders problematic. But because of their strategically important location at the electrode interface, polymers can significantly influence the surface reactions and SEI formation, if their functionalities are chosen carefully [39,41,42].…”

Section: Introductionmentioning

confidence: 97%

Influence of inactive electrode components on degradation phenomena in nano-Si electrodes for Li-ion batteries

Jeschull

Lindgren

Lacey

et al. 2016

Journal of Power Sources

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A film maturation process for improving the cycle life of Si-based anodes for Li-ion batteries

Cited by 20 publications

References 15 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

The progress of novel binder as a non-ignorable part to improve the performance of Si-based anodes for Li-ion batteries

Influence of inactive electrode components on degradation phenomena in nano-Si electrodes for Li-ion batteries

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