Effect of stress stiffness on elastic-plastic strain range

Hübel, Hartwig; Vollrath, Bastian

doi:10.1016/j.ijpvp.2021.104421

Cited by 9 publications

(1 citation statement)

References 14 publications

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“…The above binders have a linear chain structure. , It is well known that when a linear polymer is stretched, the elasticity exists only in a narrow tensile strain range . As the tensile strain is larger than a critical value, permanent irreversible deformation will occur, and it cannot recover to its original size. , Large volume changes in Si particles will exert significant stress on the binder. The binder with a linear structure will either detach from Si particles or undergo permanent irreversible deformation .…”

Section: Introductionmentioning

confidence: 99%

Cross-Linkable Binders for Si Anodes in High-Energy-Density Lithium-Ion Batteries

Xue,

Jia,

Xiang

et al. 2024

ACS Appl. Mater. Interfaces

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Although silicon (Si) has a high theoretical capacity, the large volume expansion during lithiation has greatly hindered its application in high-energy-density lithium-ion batteries (LIBs). Among the strategies for improving the performance of Si anode, the role of binders should not be underestimated. Here, a novel strategy for designing a crosslinkable binder for Si anode has been proposed. The binder with hydroxyl and nitrile groups can be in situ covalently cross-linked through the amide group in the batteries. The cross-linked binder (c-POAH) shows high elasticity and strong adhesion to Si particles and the current collector. Si||Li half coin cells using the c-POAH binder have excellent cycle performance and the capacity retention ratio is 67.1% after 100 cycles at 0.2 C. Scanning electronic microscopy images show that the c-POAH binder can contribute to suppressing the pulverization of the Si anode. Moreover, the investigation with X-ray photoelectronic spectrum demonstrates that the decomposition of the liquid electrolyte on Si anode has been mitigated and the c-POAH binder can promote the formation of a more stable SEI film. Our strategy of endowing the binder with good elasticity through in situ cross-linking has opened up a new route for developing binders, which will definitely promote the application of Si anodes in high-energy-density LIBs.

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