The Impact of Non-uniform Metal Scaffolds on the Performance of 3D Structured Silicon Anodes

Zheng, Zhuoyuan; Chen, Bin; Fritz, Nathan Joseph; Gurumukhi, Yashraj; Cook, John B.; Ateş, Mehmet Nurullah; Miljkovic, Nenad; Wang, Pingfeng

doi:10.1016/j.est.2020.101502

Cited by 16 publications

(9 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous strategies have been developed to mitigate the mechanical degradation of LIB electrodes arising from their continuous expansion and contraction during the repeated lithiation/delithiation process. These include the design of composite electrode formulations, − dimensional reduction of active materials, − 3D architectures, − and controlling the overall electrode morphology and microstructure. − However, while such approaches have been successful in leveraging electronic and ionic charge transport and minimization of cracking and pulverization of high-capacity electrodes, they are nevertheless limited by issues such as reduced content of active materials, low volumetric energy density, processing complexity, and expensive synthetic routes. Recently, polymer binders, typically an inactive component in LIBs, have gained importance in impacting the overall performance of LIBs. , Weak van der Waals binding forces and the electrically insulating nature of the commonly used PVDF have resulted in limited adhesive strength and poor flexibility and elasticity, therefore failing to be a promising polymer binder for emerging high-capacity and high-energy density electrodes that undergo huge volume expansion and contraction during charge/discharge cycles. , In this regard, conductive polymer binders with π-conjugated backbones have gained significant attention in the past decade, leveraging electronic conductivity alongside mechanical adhesion. , In fact, the simultaneous conduction of electrons and Li + ions is an important criterion for maintaining charge transport pathways in a battery environment, which ultimately impacts its rate capability and cycle life. , Such mixed conduction in polymer binders is typically achieved via multicomponent heterogeneous blends of electron and ion-conducting polymers, − block copolymers, − and single-component mixed electron and Li + ion-conducting polymers. , …”

Section: Introductionmentioning

confidence: 99%

Evaluating the Impact of Conjugation Break Spacer Incorporation in Poly(3,4-propylenedioxythiophene)-Based Cathode Binders for Lithium-Ion Batteries

Das,

Salamat,

Zayat

et al. 2024

Chem. Mater.

View full text Add to dashboard Cite

The driving force behind the significant advancement of conductive polymer binders for lithium-ion batteries (LIBs) stems from the poor binding strength, limited mechanical properties, and absence of electronic conductivity of the commonly used nonconjugated polymer binder, poly(vinylidene fluoride) (PVDF). With a goal to induce stretchability and deformability to the otherwise brittle conjugated backbone, we report here dihexyl-substituted poly(3,4-propylenedioxythiophene)-based (PProDOT-Hx 2 -based) conjugated polymers wherein conjugation break spacers (CBS, T-X-T) of varying alkyl spacer lengths (X = 6, 8, and 10) and varying contents (5, 10, and 20%) have been randomly incorporated into the PProDOT backbone, generating a family of nine random PProDOT-CBS copolymers. Electrochemical characterization revealed that three out of the nine PProDOT-CBS polymers (5% T-6-T, 5% T-8-T, and 10% T-6-T) are electrochemically stable over long-term cycling of 100 cycles. The electronic conductivity of the PProDOT-CBS polymers is consistent with previous literature reports on CBS polymers, where a decline in charge carrier mobility is observed with an increase in CBS content and spacer length, although no significant difference in ionic conductivity in these polymers was observed. This is supported by GIWAXS studies indicating a decrease in lamellar peak intensity with increasing CBS content and spacer length. Mechanical properties of the three selected PProDOT-CBS polymers were investigated by using the established "film-on-water" technique and a novel "film-on-solvent" technique that we report here for the first time, where the solvent used is the same as employed in the battery electrolyte. Both techniques showcase a generally lower tensile modulus (E) and higher crack onset strain (COS) of the PProDOT-CBS polymers relative to fully conjugated PProDOT-Hx 2 . Furthermore, significant enhancement in mechanical properties is observed with the "film-on-solvent" method, suggesting that electrolyte-induced swelling has a plasticizing effect on the polymers, accounting for their increased stretchability and deformability. Finally, cell testing of the PProDOT-CBS polymers with NCA cathodes aligned well with the electrochemical and mechanical studies, where a higher crack onset strain was crucial for higher capacity retention during long-term cycling. On the contrary, rate capability measurements proved that higher electronic conductivity is favored over mechanical properties during high rates of discharge. This work illustrates that the strategic introduction of CBS units into conjugated polymer binders is a viable method for the generation of stretchable conductive polymer binders for emerging high-capacity electrodes in LIBs.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluating the Impact of Conjugation Break Spacer Incorporation in Poly(3,4-propylenedioxythiophene)-Based Cathode Binders for Lithium-Ion Batteries

Das,

Salamat,

Zayat

et al. 2024

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…This is a common clinical problem that has grown significantly worldwide [1] as a result of trauma, cancer, infection, and arthritis [2]. Those materials can be constituted of biometal [3], biopolymer [4], bioceramic [5], and biocomposites [6]. Bioceramics materials are used in many medical procedures.…”

Section: Introductionmentioning

confidence: 99%

Alumina applied in bone regeneration: Porous α-alumina and transition alumina

et al. 2022

View full text Add to dashboard Cite

Alumina is a polymorphic bioceramic that has been extensively investigated for application in bone regeneration. Dense α-alumina has been considered a suitable biomaterial for dental and orthopedic implants due to its superior mechanical properties. However, its use is limited due to its high inertia in a biological environment. Recent investigations have focused on its distinct phases and surface characteristics through the control of morphology, physical properties, and chemical composition to enhance bioactivity. This article presents a brief review of the developments in porous α-alumina and amorphous-γ-alumina transition. Most studies have shown that composites and alumina coated with bioactive materials, high surface area, and hydroxylated surface can significantly improve biological properties. Cellular responses such as fixation, growth, and proliferation, as well as biomineralization, are the main studies to validate improvements in bioactive properties.

show abstract

“…Three-dimensional battery architectures enhance the power and energy capabilities of LIBs by providing short Li-ion diffusion pathways . Inverted opal structures for cathode and anode electrodes have also been receiving great attention due to reduced tortuosity. − To maximize the power characteristics of a LIB, Yet-Ming Chiang from MIT and his colleagues reported a novel battery electrode design with dual scale porosity to allow extremely fast discharge capabilities . Similarly, Dang et al studied Gt electrode architecture by lowering the tortuosity of the electrode using the freeze-drying method which improved the rate performance of the electrode .…”

Section: Introductionmentioning

confidence: 99%

Controlling the Crystallographic Orientation of Graphite Electrodes for Fast-Charging Li-Ion Batteries

Bayındır

Sohel

Erol

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

In this study, we report a new design paradigm for an electrode preparation method that drastically improves the fast-charging capabilities of a graphite (Gt) anode by controlling the crystallographic orientation. The crystallographic orientation of the Gt electrode is achieved under a dynamic magnetic field using commercially available neodymium magnets. When the slurry of the Gt electrode is tape casted using the conventional method with no magnetic field, the crystallographic orientation is dominated with (002) planes along with other random planes. However, once the slurry of the Gt electrode is casted and dried under a magnetic field, the Gt particles tend to orient themselves along the (100), (101), and (110) planes which are all aligned vertically to the current collector. This striking difference allows the oriented Gt electrode to reach 80% state of the charge in only 50 min at 1C charge rate, whereas the randomly distributed Gt electrode reaches 80% state of the charge in 138 min at 1C charge rate using a constant current−constant voltage charging protocol. The outstanding electrochemical performance of the oriented Gt electrodes was characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, electrochemical cycling, and electrochemical impedance spectroscopy techniques.

show abstract

The Impact of Non-uniform Metal Scaffolds on the Performance of 3D Structured Silicon Anodes

Cited by 16 publications

References 50 publications

Evaluating the Impact of Conjugation Break Spacer Incorporation in Poly(3,4-propylenedioxythiophene)-Based Cathode Binders for Lithium-Ion Batteries

Evaluating the Impact of Conjugation Break Spacer Incorporation in Poly(3,4-propylenedioxythiophene)-Based Cathode Binders for Lithium-Ion Batteries

Alumina applied in bone regeneration: Porous α-alumina and transition alumina

Controlling the Crystallographic Orientation of Graphite Electrodes for Fast-Charging Li-Ion Batteries

Contact Info

Product

Resources

About