Designing Adaptive Binders for Microenvironment Settings of Silicon Anode Particles

Lee, Haesung A.; Shin, Mikyung; Kim, Jaemin; Choi, Jang Wook; Lee, Haeshin

doi:10.1002/adma.202007460

Cited by 63 publications

(46 citation statements)

References 41 publications

(72 reference statements)

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“…Nowadays, several issues such as huge volume expansions, low conductivity, and unstable SEI film hinder the real application of Si anodes ( Son et al, 2015 ; Franco Gonzalez et al, 2017 ; Huang et al, 2021 ; Yang et al, 2021 ). To address these challenges, researchers mainly concentrate on the design of Si nanomaterials and the optimization of electrolytes but pay fewer attention to the binders ( Lee et al, 2021 ). It seems that the binders account for a small proportion in anode composition without direct contribution to the capacity, but actually, binders play an important role in maintaining the inert electrical contact and the SEI stability of anodes, which will affect the anodes in porosity, wettability, electronic/ionic conductivities, polarization, etc.…”

Section: Introductionmentioning

confidence: 99%

Progress of Binder Structures in Silicon-Based Anodes for Advanced Lithium-Ion Batteries: A Mini Review

et al. 2021

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Silicon (Si) has been counted as the most promising anode material for next-generation lithium-ion batteries, owing to its high theoretical specific capacity, safety, and high natural abundance. However, the commercial application of silicon anodes is hindered by its huge volume expansions, poor conductivity, and low coulombic efficiency. For the anode manufacture, binders play an important role of binding silicon materials, current collectors, and conductive agents, and the binder structure can significantly affect the mechanical durability, adhesion, ionic/electronic conductivities, and solid electrolyte interface (SEI) stability of the silicon anodes. Moreover, many cross-linked binders are effective in alleviating the volume expansions of silicon nanosized even microsized anodic materials along with maintaining the anode integrity and stable electrochemical performances. This mini review comprehensively summarizes various binders based on their structures, including the linear, branched, three-dimensional (3D) cross-linked, conductive polymer, and other hybrid binders. The mechanisms how various binder structures influence the performances of the silicon anodes, the limitations, and prospects of different hybrid binders are also discussed. This mini review can help in designing hybrid polymer binders and facilitating the practical application of silicon-based anodes with high electrochemical activity and long-term stability.

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Section: Introductionmentioning

confidence: 99%

Progress of Binder Structures in Silicon-Based Anodes for Advanced Lithium-Ion Batteries: A Mini Review

et al. 2021

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“…0.4 V vs Li/Li + , and high terrestrial abundance. 4,5 However, low cyclic stability, low rate performance, and low initial Coulombic efficiency (ICE) caused by the large volume change of the Si anode during cycling, a low intrinsic electronic conductivity, and the repetitive formation of an unstable solid electrolyte interphase (SEI) caused by the severe side reactions of Si with electrolytes are the three major drawbacks hindering the commercialization of Si-based anodes. 6−10 To tackle these issues, addressable strategies have been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the widespread use of lithium-ion batteries (LIBs) in plethoras of portable consumer electronic devices and electric vehicles, tremendous efforts have been made to meet the increasing demands for high energy and power density output in energy storage systems. − …”

Section: Introductionmentioning

confidence: 99%

“…Among various anode materials, silicon (Si) is regarded as a promising candidate to replace the traditional commercial graphite anodes for LIBs owing to its advantages of high theoretical specific capacity of 3579 mAh g –1 for Li 15 Si 4 , low potential of ca. 0.4 V vs Li/Li + , and high terrestrial abundance. , However, low cyclic stability, low rate performance, and low initial Coulombic efficiency (ICE) caused by the large volume change of the Si anode during cycling, a low intrinsic electronic conductivity, and the repetitive formation of an unstable solid electrolyte interphase (SEI) caused by the severe side reactions of Si with electrolytes are the three major drawbacks hindering the commercialization of Si-based anodes. − …”

Section: Introductionmentioning

confidence: 99%

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A Novel Tin-Bonded Silicon Anode for Lithium-Ion Batteries

Dong

Yan

et al. 2021

ACS Appl. Mater. Interfaces

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Poor cyclic stability and low rate performance due to dramatic volume change and low intrinsic electronic conductivity are the two key issues needing to be urgently solved in silicon (Si)-based anodes for lithium-ion batteries. Herein, a novel tin (Sn)-bonded Si anode is proposed for the first time. Sn, which has a high electronic conductivity, is used to bond the Sianode material and copper (Cu) current collector together using a hot-pressed method with a temperature slightly above the melting point of Sn. The cycling performance of the electrode is studied using a galvanostatic method. Nanoindentation and peeling tests are conducted to measure the mechanical strength of the electrodes. Direct current polarization and galvanostatic intermittent titration techniques are applied to assess the conductivity of the composites. Electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy are conducted to evaluate the effect of the coating layer on the cycling ability of the composites. The Sn-bonded Si anodes show superior cycling stability and high rate performance with an improved initial Coulombic efficiency. Analyses reveal that the low-melting-point Sn helps to markedly improve the electronic conductivity of the electrodes and serves as a metallic binder as well to enhance the adhesive strength of the electrode. It is hopeful that this novel Sn-bonded Si anode provides a new insight for the development of advanced Si-based anodes for LIBs.

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“…In addition to active materials, conductive additives and binders have a low weight percentage but also play an important role in connecting silicon particles and a copper current collector. − Therefore, more and more researchers focus on seeking reasonable matching binders for the silicon anode. , Poly(vinylidene fluoride) (PVDF) with a symmetric structure of fluorine-bonded carbon skeleton has been widely used in industry, demonstrating a high chemical stability . However, the weak van der Waals force between the PVDF and the silicon particles cannot successfully resist the physical stress during the lithiation/delithiation process …”

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confidence: 99%

Binary Network of Conductive Elastic Polymer Constraining Nanosilicon for a High-Performance Lithium-Ion Battery

Feng

Zheng³

et al. 2021

ACS Nano

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Silicon-based anodes are attracting more interest in both science and industry due to their high energy density. However, the traditional polymeric binder and carbon additive mixture cannot successfully accommodate the huge volume change and maintain good conductivity when cycling. Herein, we report a multifunctional polymeric binder (PPTU) synthesized by the cross-linking of conducting polymer (PEDOT:PSS) and stretchable polymer poly(ether-thioureas) (PETU). The multifunctional polymeric binder could be curved on the surfaces of nanosilicon particles, forming an interweaving continuous three-dimensional network, which is beneficial to electron transfer and the mechanical stability. Furthermore, the binder is elastic and adhesive, and which can accommodate the huge volume change of silicon to keep its integrity. Utilizing this multifunctional polymeric binder instead of commercial poly(acrylic acid) binder and carbon black mixtures, the nanosilicon anode demonstrates enhanced cycling stability (2081 mAhg–1 after 300 cycles) and rate performance (908 mAhg–1 at 8 Ag–1). The multifunctional polymeric binder has high conductivity, elasticity, and self-healing properties is a promising binder to promote progress toward a high performance lithium-ion battery.

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Designing Adaptive Binders for Microenvironment Settings of Silicon Anode Particles

Abstract: The data that support the findings of this study are available from the corresponding author upon reasonable request.

Cited by 63 publications

References 41 publications

Progress of Binder Structures in Silicon-Based Anodes for Advanced Lithium-Ion Batteries: A Mini Review

Progress of Binder Structures in Silicon-Based Anodes for Advanced Lithium-Ion Batteries: A Mini Review

A Novel Tin-Bonded Silicon Anode for Lithium-Ion Batteries

Binary Network of Conductive Elastic Polymer Constraining Nanosilicon for a High-Performance Lithium-Ion Battery

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