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A polyisoindigo derivative as novel n-type conductive binder inside Si@C nanoparticle electrodes for Li-ion battery applications

Adrien Mery 1 Pierre Bernard 2 Anthony Valero 3 John Alper 4 Nathalie Herlin-Boime 4 Cédric Haon 2 Florence Duclairoir 5 Said Sadki 3
3 STEP - Synthèse, Structure et Propriétés de Matériaux Fonctionnels
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/IRIG/SYMMES
4 LEDNA - Laboratoire Edifices Nanométriques
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
5 CAMPE - Conception d’Architectures Moléculaires et Processus Electroniques
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/IRIG/SYMMES
Abstract : Herein we report the successful use of a polyisoindigo derivative (P(iso)) as a new conductive binder inside electrode formulations containing silicon nanoparticles covered with a carbon shell (Si@C) for Li-ion batteries. The expected role of the carbon shell is to stabilize the Solid Electrolyte Interphase layer (SEI) to prevent it from cracking under nanoparticle volume variations during lithiation processes. The P(iso) conducting polymer is used to act both as mechanical binder and n-type conductive component in replacement of usual carbonaceous additive materials. Ultimately, the cumulative contributions of both materials inside a two-electrode component formulation (Si@CP(iso)) aim to address the stability drawbacks commonly faced by silicon electrodes. Physico-chemical characterizations revealed that the Si@C nanoparticles are uniformly embedded inside the polymeric matrix. Electrochemical measurements in half-cells clearly show the formation of LiSi alloys during cycling. Moreover specific capacities up to 1400 mAh/g with a remarkable stability until 500 cycles have been achieved, proving this conductive polymer to be a valid alternative to classical polymeric binders mixed with carbonaceous additives. These very promising results highlight the use of this polyisoindigo family as new conductive binders inside Si@C electrode formulations for Li-ion battery applications.
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Submitted on : Friday, October 22, 2021 - 11:51:10 AM
Last modification on : Thursday, November 25, 2021 - 2:00:04 PM

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Adrien Mery, Pierre Bernard, Anthony Valero, John Alper, Nathalie Herlin-Boime, et al.. A polyisoindigo derivative as novel n-type conductive binder inside Si@C nanoparticle electrodes for Li-ion battery applications. Journal of Power Sources, Elsevier, 2019, 420, pp.9-14. ⟨10.1016/j.jpowsour.2019.02.062⟩. ⟨cea-02295160⟩

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