In Situ-Formed Novel Elastic Network Binder for a Silicon Anode in Lithium-Ion Batteries

Liu, Zhimeng; Chen, Fang; He, Xin; Zhao, Yinjian; Xu, Hualiang; Lei, Jingxin; Liu, Gao

doi:10.1021/acsami.1c09607

Cited by 36 publications

(24 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Establishing Mechanically Robust Electrodesmentioning

confidence: 99%

“…Despite the strong binding effect exhibited by covalent bonds, it should be noted that cross-linking could lower the solubility of binders in solvents (e.g., H 2 O, NMP) and eventually result in inhomogeneity of the electrodes. To circumvent this issue, Liu et al reported a polymer binder with a highly stretchable and elastic network structure that was realized by in situ cross-linking of PAA with isocyanate-terminated polyurethane oligomers consisting of poly(ethylene glycol) (PEG) chains and UPy moieties through the reaction between isocyanate and carboxyl groups during the electrode preparation process (Figure C) . This binder not only sufficiently accommodates the volume change of Si but also provides strong mechanical support to effectively sustain the integrity of the Si anodes.…”

Section: Establishing Mechanically Robust Electrodesmentioning

confidence: 99%

See 1 more Smart Citation

Establishing a Resilient Conductive Binding Network for Si-Based Anodes via Molecular Engineering

et al. 2022

View full text Add to dashboard Cite

Metrics & MoreArticle Recommendations CONSPECTUS: Silicon-based anode materials have become a research hot spot as the most promising candidates for next-generation high-capacity lithium-ion batteries. However, the irreversible degradation of the conductive network in the anode and the resultant dramatic capacity loss have become two ultimate challenges that stem from inherent characteristics of the Si-based materials, including poor conductivity and massive volume changes (up to 300%) during cycling. Apart from optimization of the active materials, one effective way to stabilize high-capacity Sibased anodes is by designing polymeric binders to reinforce the conductive networks during repeated charge and discharge processes. As an inactive component in the electrode, the binder not only holds other components (e.g., active materials, conductive agents, and current collectors) together to maintain the mechanical integrity of the electrode but also serves as a thickener to facilitate the homogeneous distribution of particles. Therefore, binders play a key role in Si-based anodes by maintaining the integrity of conductive networks in the electrode.In this Account, on the basis of the extensive binder-related work on Si-based anodes since the 2000s, efforts made on maintaining the conductive network can be categorized into two main strategies: (1) stabilization of the primary conductive network (which generally refers to conductive agents) by enhancing the binding strength and resilience of the binding between electrode components (i.e., Si particles, conducting agents, and current collectors) via various interactions (e.g., dipolar interactions and covalent bonds) and (2) construction of the secondary conductive network by employing conductive binders, which serve as a molecular-level conductive layer on active materials. In this sense, functional groups in binders can be divided into two categories: mechanical structural units and conductive structural units. On the one hand, functional groups with strong polarities (e.g., −OH, −COOH, −NH 2, and −CONH−) generally serve as binding structural units because of their bonding tendencies; on the other hand, exhibiting high electronic conductivity, conjugated functional groups (e.g.

show abstract

Section: Establishing Mechanically Robust Electrodesmentioning

confidence: 99%

Section: Establishing Mechanically Robust Electrodesmentioning

confidence: 99%

Establishing a Resilient Conductive Binding Network for Si-Based Anodes via Molecular Engineering

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Liu and his colleagues 85 constructed a highly stretchable and elastic network polymer binder (named CPAU) for Si anodes that could be formed in situ during electrode fabrication. Figure 7c is a schematic diagram of the elastic network structure of monomer PAA and polyurethane oligomers (PUOs).…”

Section: ■ Structural Design Schemementioning

confidence: 99%

Section: Structural Design Schemementioning

confidence: 99%

Revisit the Progress of Binders for a Silicon-Based Anode from the Perspective of Designed Binder Structure and Special Sized Silicon Nanoparticles

Lai

Yang

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Si-based anodes have the advantages of high energy density and abundant reserve. However, their severe volume change during the charge–discharge process leads to particles’ pulverization and electrode destruction, which hinder their commercial application. Nanostructured Si is effective at relieving the expansion strain, and binders with a small proportion have been proven to play a pivotal role in maintaining the Si-based electrode integration. Si nanoparticles of various sizes show different particuological behaviors, including distribution, aggregation, etc. Moreover, the binders with specific molecular structure also have unique bonding characteristics with Si particles of different sizes. Except the aforementioned aspects, the process techniques of Si nanoparticles and binders also greatly affect the electrode. Though some pioneering reviews about the progress of binders for Si-based anodes have been published, in order to boost the practical application of Si-based anodes, it is urgent to revisit the previous investigations to clarify the correlation of the particle size, binder structure, and process techniques.

show abstract

“…In addition, tuning the electrochemistry at the Si electrode interface, especially the formation and growth of solid electrolyte interphase (SEI), is also a critical research topic for Si-based LIBs [21][22][23][24]. Sophisticated nanostructures and binder systems have been developed to serve these purposes and thus to improve the performance of Si anodes [25][26][27][28][29][30][31]. However, the synthetic complexity of these nano materials and structures could very possibly bring significant challenges in actual large-scale application.…”

Section: Introductionmentioning

confidence: 99%

Recent Applications of Molecular Structures at Silicon Anode Interfaces

Chen¹,

Liu²

2021

Electrochem

Self Cite

View full text Add to dashboard Cite

Silicon (Si) is a promising anode material to realize many-fold higher anode capacity in next-generation lithium-ion batteries (LIBs). Si electrochemistry has strong dependence on the property of the Si interface, and therefore, Si surface engineering has attracted considerable research interest to address the challenges of Si electrodes such as dramatic volume changes and the high reactivity of Si surface. Molecular nanostructures, including metal–organic frameworks (MOFs), covalent–organic frameworks (COFs) and monolayers, have been employed in recent years to decorate or functionalize Si anode surfaces to improve their electrochemical performance. These materials have the advantages of facile preparation, nanoscale controllability and structural diversity, and thus could be utilized as versatile platforms for Si surface modification. This review aims to summarize the recent applications of MOFs, COFs and monolayers for Si anode development. The functionalities and common design strategies of these molecular structures are demonstrated.

show abstract

In Situ-Formed Novel Elastic Network Binder for a Silicon Anode in Lithium-Ion Batteries

Cited by 36 publications

References 35 publications

Establishing a Resilient Conductive Binding Network for Si-Based Anodes via Molecular Engineering

Establishing a Resilient Conductive Binding Network for Si-Based Anodes via Molecular Engineering

Revisit the Progress of Binders for a Silicon-Based Anode from the Perspective of Designed Binder Structure and Special Sized Silicon Nanoparticles

Recent Applications of Molecular Structures at Silicon Anode Interfaces

Contact Info

Product

Resources

About