Amphiphilic Graft Copolymers as a Versatile Binder for Various Electrodes of High‐Performance Lithium‐Ion Batteries

Lee, Jung-In; Kang, Hyojin; Park, Kwang Hyun; Shin, Myoungsu; Hong, Dongki; Cho, Hye Jin; Kang, Namgoo; Lee, Jung-Ho; Lee, Sang Myeon; Kim, Ju‐Young; Kim, Choon Ki; Park, Hyesung; Choi, Nam‐Soon; Park, Soo‐Jin; Yang, Changduk

doi:10.1002/smll.201600800

Cited by 51 publications

(31 citation statements)

References 50 publications

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“…However, Si@N‐P‐LiPN electrode demonstrates a smaller semicircle in the middle frequency range in comparison to Si@N‐PN electrode after 100 cycles at 0.2 C, representing smaller charge‐transfer resistance ( R ct ). [ 63–65 ] Moreover, Si@N‐P‐LiPN electrode displays a steeper sloping line than that of Si@N‐PN electrode, which further confirms faster Li‐ion transporting behavior of Si@N‐P‐LiPN electrode compared with Si@N‐PN electrode. [ 49 ]…”

Section: Figurementioning

confidence: 99%

Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries

Zhang

Liu

et al. 2020

Advanced Energy Materials

279

206

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storage and engineering heterogeneous structure for lithium transfer are the key for improving the energy density and rate performance of LIBs. [4][5][6][7][8] Silicon (Si), a naturally abundant material with outstanding theoretical capacity (4200 mAh g −1 ), has attracted extensive attention as an alternative promising anode for high-energydensity LIBs, which is ten times larger than the conventional graphite anode (372 mAh g −1 ). [9][10][11][12] However, Si inherently has large volume change that seriously undermines electrode integrity and solid electrolyte interface (SEI) film formed on the Si surface. Repairing and growth of the SEI film leads to reduced amount of available Liions, corresponding to the capacity decline of LIBs. [13][14][15] Generally, engineering Si materials is widely adopted to relieve the influence of large volume change and enhance lithium diffusion within the electrode. [16][17][18] However, high cost is barely accepted into the industry due to complex preparation process. Furthermore, most methods are not based on the mass-loading-oriented strategy for high-energy-density LIBs. [19] Binder is the key component in the electrode to bond active material and conductive additive together on current collector and keep electrode integrity during charge/discharge processes. [20][21][22] Recently, the functions of the binders, such as N-P-LiPN) is constructed by the partially lithiated hard polyacrylic acid as a framework and partially lithiated soft Nafion as a buffer via the hydrogen binding effect. N-P-LiPN has strong adhesion and mechanical properties to accommodate huge volume change of the Si anode. In addition, lithiumions are transferred via the lithiated groups of N-P-LiPN, which significantly enhances the ionic conductivity of the Si anode. Hence, the Si@N-P-LiPN electrodes achieve the highest initial Coulombic efficiency of 93.18% and a stable cycling performance for 500 cycles at 0.2 C. Specially, Si@N-P-LiPN electrodes demonstrate an ultrahigh-areal-capacity of 49.59 mAh cm −2 . This work offers a new approach for inspiring the battery community to explore novel binders for next-generation high-energy-density storage devices. High-capacity electrode materials play a vital role for high-energy-density lithium-ion batteries. Silicon (Si) has been regarded as a promising anode material because of its outstanding theoretical capacity, but it suffers from an inherent volume expansion problem. Binders have demonstrated improvements in the electrochemical performance of Si anodes. Achieving ultrahigh-areal-capacity Si anodes with rational binder strategies remains a significant challenge. Herein, a binder-lithiated strategy is proposed for ultrahigh-areal-capacity Si anodes. A hard/soft modulated trifunctional network binder (

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Section: Figurementioning

confidence: 99%

Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries

Zhang

Liu

et al. 2020

Advanced Energy Materials

279

206

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“…8). 63 Upon heating the electrode at 230 1C under vacuum for overnight, PtBA of PVDF-g-PtBA was pyrolyzed to poly(acrylic acid) (PAA) which can form hydrogen bonds and/or covalent bonds with Si. The electrochemical performance of the Si anodes was examined using an electrode consisting of 60 wt% Si (3D porous Si, Si loading = 2 mg cm À2 ), 20 wt% conductive agent (Super P), and 20 wt% binder.…”

Section: à2mentioning

confidence: 99%

The emerging era of supramolecular polymeric binders in silicon anodes

2018

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Silicon (Si) anode is among the most promising candidates for the next-generation high-capacity electrodes in Li-ion batteries owing to its unparalleled theoretical capacity (4200 mA h g À1 for Li 4.4 Si) that is approximately 10 times higher than that of commercialized graphitic anodes (372 mA h g À1 for LiC 6 ).The battery community has witnessed substantial advances in research on new polymeric binders for silicon anodes mainly due to the shortcomings of conventional binders such as polyvinylidene difluoride (PVDF) to address problems caused by the massive volume change of Si (300%) upon (de)lithiation. Unlike conventional battery electrodes, polymeric binders have been shown to play an active role in silicon anodes to alleviate various capacity decay pathways. While the initial focus in binder research was primarily to maintain the electrode morphology, it has been recently shown that polymeric binders can in fact help to stabilize cracked Si microparticles along with the solid-electrolyte-interphase (SEI) layer, thus substantially improving the electrochemical performance. In this review article, we aim to provide an in-depth analysis and molecular-level design principles of polymeric binders for silicon anodes in terms of their chemical structure, superstructure, and supramolecular interactions to achieve good electrochemical performance. We further highlight that supramolecular chemistry offers practical tools to address challenging problems associated with emerging electrode materials in rechargeable batteries.

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“…The improvement of electrochemical performance could be attributed to the intensive adhesive cohesive force of PDA-PAA-PEO due to the strong interaction between functional groups (carboxyl and catechol) and hydroxyl groups on the SI surface. [46][47][48] Furthermore, the higher ion conductivity of PEO blocks was benecial for decreasing the interfacial charge transfer impedance of electrodes, which resulted in the high capacity of Si/PDA-PAA-PEO. 49,50 To investigate further the electrochemical characteristics of binders, EIS was done between 10 kHz and 10 MHz.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of triblock copolymer polydopamine-polyacrylic-polyoxyethylene with excellent performance as a binder for silicon anode lithium-ion batteries

Liu

Xiao

et al. 2018

RSC Adv.

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Amphiphilic Graft Copolymers as a Versatile Binder for Various Electrodes of High‐Performance Lithium‐Ion Batteries

Cited by 51 publications

References 50 publications

Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries

Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries

The emerging era of supramolecular polymeric binders in silicon anodes

Synthesis of triblock copolymer polydopamine-polyacrylic-polyoxyethylene with excellent performance as a binder for silicon anode lithium-ion batteries

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