High Capacity Silicon Electrodes with Nafion as Binders for Lithium-Ion Batteries

Xu, Jiagang; Zhang, Qinglin; Cheng, Yang‐Tse

doi:10.1149/2.0261603jes

Cited by 82 publications

(43 citation statements)

References 33 publications

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“…The full cell of porous Si/natural graphite coupled with LiNi 0. While Li-Nafion-Si anode showed much better cycle life than that of Nafion-Si, other research 55,65 for Si nanoparticle anodes showed that their performance was almost comparable or Li-Nafion-Si was slightly better.…”

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confidence: 88%

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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confidence: 88%

The emerging era of supramolecular polymeric binders in silicon anodes

2018

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“…For the purpose of achieving the hard/soft plastic/elastomer strategy while enhancing the adhesion strength and ionic conductivity, hard PAA and soft Nafion with large amount of functional groups that can be partially lithiated were chosen as precursors in this work. [ 34,35 ] The preparation of N‐P‐LiPN binder is displayed in Figure 1 a. The pH values of PAA and Nafion were adjusted to ≈5.2 with 10 wt% and 0.1 m lithium hydroxide, respectively, achieving the partially lithiated binders, named as P‐LiPAA and P‐LiNF.…”

Section: Figurementioning

confidence: 99%

“…The N‐P‐LiPN binder possesses a large number of functional groups, which could significantly improve adhesion on SiNPs by occurring hydrogen and covalent bonding interactions with the silanol groups (SiOH) on the SiNPs surface. [ 34,35,54,55 ] As shown in Figure S21, Supporting Information, even if coated on such a large area, the active material is evenly distributed on the front and back side of current collector. The surface of the Si electrode is smooth and flat, indicating outstanding adhesion strength of the N‐P‐LiPN binder with the Si active material and current collector.…”

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

258

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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“…Another crucial failure mechanism is the unstable SEI at the silicon surface which is cracked by mechanical stress and formed repeatedly consuming the electrolyte comparable to lithium metal anodes. 9 Recently, signicant progress has been made by using nanoscale silicon structures like nanoparticles, [10][11][12][13][14][15][16] thin lms, 8,[17][18][19] nanotubes, [20][21][22] nanowires [23][24][25][26][27] and nanoporous silicon [28][29][30][31][32] to overcome these problems. 33 Several of these Si based anodes were coupled with a sulfur cathode to generate a SLS full cell reducing the lithium excess.…”

Section: Introductionmentioning

confidence: 99%