The existence of optimal molecular weight for poly(acrylic acid) binders in silicon/graphite composite anode for lithium-ion batteries

Hu, Bin; Shkrob, Ilya A.; Zhang, Shuo; Zhang, Linghong; Zhang, Jingjing; Li, Yan; Liao, Chen; Zhang, Zhengcheng; Lu, Wenquan; Zhang, Lu

doi:10.1016/j.jpowsour.2017.12.068

Cited by 80 publications

(66 citation statements)

References 18 publications

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“…For linear polymer binders, the binding ability is largely decided by their molecular weight ( M w ) and side groups 28,42,52‐54 . By means of copolymerization, blending or post‐modification, the binding ability can be further improved.…”

Section: Designing Of Polymer Binders For Si‐based Anodesmentioning

confidence: 99%

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Advances of polymer binders for silicon‐based anodes in high energy density lithium‐ion batteries

Zhao

Yue²,

Li³

et al. 2021

InfoMat

207

151

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Conventional lithium‐ion batteries (LIBs) with graphite anodes are approaching their theoretical limitations in energy density. Replacing the conventional graphite anodes with high‐capacity Si‐based anodes represents one of the most promising strategies to greatly boost the energy density of LIBs. However, the inherent huge volume expansion of Si‐based materials after lithiation and the resulting series of intractable problems, such as unstable solid electrolyte interphase layer, cracking of electrode, and especially the rapid capacity degradation of cells, severely restrict the practical application of Si‐based anodes. Over the past decade, numerous reports have demonstrated that polymer binders play a critical role in alleviating the volume expansion and maintaining the integrity and stable cycling of Si‐based anodes. In this review, the state‐of‐the‐art designing of polymer binders for Si‐based anodes have been systematically summarized based on their structures, including the linear, branched, crosslinked, and conjugated conductive polymer binders. Especially, the comprehensive designing of multifunctional polymer binders, by a combination of multiple structures, interactions, crosslinking chemistries, ionic or electronic conductivities, soft and hard segments, and so forth, would be promising to promote the practical application of Si‐based anodes. Finally, a perspective on the rational design of practical polymer binders for the large‐scale application of Si‐based anodes is presented.

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Section: Designing Of Polymer Binders For Si‐based Anodesmentioning

confidence: 99%

“…In addition, the binding ability of PAA can also be regulated or optimized though neutralization by NaOH or LiOH, and controlling its M w (Figure 5C). 41,42,53,80‐84 …”

Section: Designing Of Polymer Binders For Si‐based Anodesmentioning

confidence: 99%

Advances of polymer binders for silicon‐based anodes in high energy density lithium‐ion batteries

Zhao

Yue²,

Li³

et al. 2021

InfoMat

207

151

View full text Add to dashboard Cite

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“…For bPAA‐3, the shear‐thinning effect is more pronounced throughout the measuring range, which may result from the higher branching degree as branched polymers are more susceptible to shear thinning . While the M n of those binders may play a role, the branching could also contribute to these changes . The power‐law model is used to compare the shear‐thinning effect in each binder

η = K {(\dot{γ})}^{n - 1}

where η is the apparent viscosity,

\overset{γ}{true}

is the shear rate, K is the consistency index, and n is the flow behavior index.…”

Section: Resultsmentioning

confidence: 99%

“…Among them, sodium carboxymethyl cellulose, alginate, and poly(acrylic acid) (PAA) are some representative examples . It is believed that these polar groups, like carboxylates, may form chemical bonding with silanol (Si–OH) groups on the surface of SiNPs, thus leading to strong adhesion and less electrode delamination . However, simply enhancing one property does not seem to be enough to counteract the rapid capacity fade that may result from a combination of the aforementioned unfavorable issues.…”

Section: Introductionmentioning

confidence: 99%

Re‐Engineering Poly(Acrylic Acid) Binder toward Optimized Electrochemical Performance for Silicon Lithium‐Ion Batteries: Branching Architecture Leads to Balanced Properties of Polymeric Binders

Jiang

Shi

et al. 2019

Adv Funct Materials

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Silicon is a promising anode material for lithium‐ion batteries with its superior capacity. However, the drastic volume changes during lithiation/delithiation cycles hinder the cycling performance, resulting in particle pulverization, conductivity loss, and an unstable electrode–electrolyte interface. Herein, a series of synthetic polymeric binders, poly(acrylic acid‐co‐tetra(ethylene glycol) diacrylate)—featuring a poly(acrylic acid) (PAA) backbone branched via tetra(ethylene glycol) diacrylate (TEGDA)—are developed that edge toward evidencing well‐balanced properties to confront capacity fading in Si‐based electrodes. The incorporation of ether chain not only leads to the branching architecture of the PAA backbone, thus affecting its mechanical properties, but also promotes the conductivity of Li ions. As a result, a synergistic performance improvement is observed in both half and full cells. The best‐performing cell using a branched PAA binder (bPAA) with a feeding molar ratio ([TEGDA]:[acrylic acid(AA)]) of 0.2 results in a 10% increase in initial capacity and a 31% increase in capacity retention over 100 cycles compared to the linear PAA cell. The cross‐sectional microscopic images of the cycled electrodes reveal that bPAA binders can drastically reduce the electrode expansion. This improvement results from the well‐balanced properties of the polymer design, which could guide further development for more advanced binder materials.

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“…Most of these studies focus on the use of a single binder with a single silicon source that then are subjected to different drying schemes, voltage ranges, cycle number, processing conditions . Others focus on the same base binder with chemical modifications to the backbone or chemical structure or ratio of components . There have been comparably fewer reports investigating two or more binders with the same silicon and the results are often conflicting.…”

Section: Figurementioning

confidence: 99%

Ending the Chase for a Perfect Binder: Role of Surface Chemistry Variation and its Influence on Silicon Anodes

2020

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In this work we examine the influence of the type of silicon source material (two milled and two plasma enhanced chemical vapor deposition) on the electrochemical performance of silicon-based anodes for Li-ion batteries. The four representative Si sources were previously identified in literature but have never been compared side by side, which is critical to understanding the wide variation in performance reported for siliconbased electrodes. These particles display unique surface

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The existence of optimal molecular weight for poly(acrylic acid) binders in silicon/graphite composite anode for lithium-ion batteries

Cited by 80 publications

References 18 publications

Advances of polymer binders for silicon‐based anodes in high energy density lithium‐ion batteries

Advances of polymer binders for silicon‐based anodes in high energy density lithium‐ion batteries

Re‐Engineering Poly(Acrylic Acid) Binder toward Optimized Electrochemical Performance for Silicon Lithium‐Ion Batteries: Branching Architecture Leads to Balanced Properties of Polymeric Binders

Ending the Chase for a Perfect Binder: Role of Surface Chemistry Variation and its Influence on Silicon Anodes

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