Enhanced electrochemical properties of a Si-based anode using an electrochemically active polyamide imide binder

Choi, Nam‐Soon; Yew, Kyoung Han; Choi, Wonchang; Kim, Sung‐Soo

doi:10.1016/j.jpowsour.2007.11.082

Cited by 149 publications

(102 citation statements)

References 14 publications

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“…PVDF as a binder exhibits good binding ability to active materials/current collectors, reasonable electrochemical stability, and good wettability toward polar electrolyte solutions for facile Li ion transport. However, the PVDF binder does not endure large volume changes of Sibased anodes due to its insufficient mechanical strength [19]. To overcome the mechanical fracturing of electrodes induced by the extreme volumetric changes of Si, promising approaches to design appropriate polymer structures have been reported.…”

Section: Polymeric Binders In Libsmentioning

confidence: 99%

“…In an attempt to overcome the mechanical disintegration of a Si-based anode due to large changes in the volume during Li + insertion and extraction, our group found that the mechanical properties of polymeric binders are critical factors in the colossal volume expansion of Si micro-sized particles [19]. Indeed, polyamide imide (PAI) with a high mechanical strength drastically improved the electrochemical performance of micro-Si anodes compared to a commercial PVDF binder.…”

Section: Copolymersmentioning

confidence: 99%

“…The use of a functional polymeric binder in Si-based anodes is expected to prevent electrical contact loss between the Si particles and to accommodate severe volume changes (ca. 400%) during cycling [17][18][19]. Recent results have shown that sodium carboxymethyl cellulose (CMC) and poly(acrylic acid) (PAA) binders improve the electrochemical performance of Si-based anodes compared to poly(vinylidene fluoride) (PVDF) binders [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Recent Progress on Polymeric Binders for Silicon Anodes in Lithium-Ion Batteries

Choi

Lee

et al. 2015

Journal of Electrochemical Science and Technology

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Advanced polymeric binders with unique functions such as improvements in the electronic conduction network, mechanical adhesion, and mechanical durability during cycling have recently gained an increasing amount of attention as a promising means of creating high-performance silicon (Si) anodes in lithium-ion batteries with high energy density levels. In this review, we describe the key challenges of Si anodes, particularly highlighting the recent progress in the area of polymeric binders for Si anodes in cells.

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Section: Polymeric Binders In Libsmentioning

confidence: 99%

Section: Copolymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Progress on Polymeric Binders for Silicon Anodes in Lithium-Ion Batteries

Choi

Lee

et al. 2015

Journal of Electrochemical Science and Technology

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“…9 Most of these studies were performed with the commercially available binder, polyvinylidene fluoride (PVDF), which is widely used in Li-ion batteries because of its electrochemical stability at the high voltage range. In recent years, new binder development includes (1) seeking new electronically conductive binders with high elasticity in order to accommodate the large volume change of AMs during insertion and extraction of lithium-ions, 7,[10][11][12][13][14][15][16][17] (2) replacing the costly, environmentally unfriendly, and volatile organic solvent used in the manufacturing of electrode, [18][19][20] and (3) increasing the adhesion strength between the binder and other components of electrode (AMs and conductive materials in general). 5,[21][22][23][24][25][26] However, the development of binders is hindered by the lack of standard tests of binder adhesion properties and a fundamental understanding of adhesion mechanism.…”

mentioning

confidence: 99%

Unveiling the Roles of Binder in the Mechanical Integrity of Electrodes for Lithium-Ion Batteries

Chen

Liu

et al. 2013

J. Electrochem. Soc.

153

102

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In lithium-ion secondary batteries research, binders have received the least attention, although the electrochemical performance of Li-ion batteries such as specific capacity and cycle life cannot be achieved if the adhesion strengths between electrode particles and between electrode films and current collectors are insufficient to endure charge-discharge cycling. In this paper, the roles of binders in the mechanical integrity of electrodes for lithium-ion batteries were studied by coupled microscratch and digital image correlation (DIC) techniques. A microscratch based composite model was developed to decouple the carbon particle/particle cohesion strength from the electrode-film/copper-current-collector adhesion strength. The dependences of microscratch coefficient of friction and the critical delamination load on the PVDF binder content suggest that the strength of different interfaces is ranked as follows: Cu/PVDF < carbon-particle/PVDF < PVDF/PVDF. The particle/particle cohesion strength increases while electrode-film/current-collector adhesion strength decreases with increasing PVDF binder content (up to 20% of binder). The electrolyte soaking-and-drying process leads to an increase in particle/particle cohesion but a decrease in electrode-film/copper-current-collector adhesion. Finally, the methodology developed here can provide new guidelines for binder selection and electrode design and lay a constitutive foundation for modeling the mechanical properties and performance of the porous electrodes in lithium-ion batteries.

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“…Since the Si material used in both electrodes are the same, the difference in coulombic efficiency is not due to the material (surface or bulk), but to the strength of the binder, as PI is known to be stronger than CMC. 13,[27][28][29] Our results suggest that about 2-3% of the irreversibility of the Si-CMC electrodes comes from mechanical problems in the electrode. Figures 9c and 9d show the cycle performance of Si-CMC and Si-PI electrodes with 1000 mAh g −1 capacity limitation.…”

Section: Methodsmentioning

confidence: 69%

Insights from Studying the Origins of Reversible and Irreversible Capacities on Silicon Electrodes

Lee

2016

J. Electrochem. Soc.

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Silicon electrodes can give high capacity as anodes for lithium-ion batteries. However, there has not been much work quantifying the different contributions to the reversible and irreversible capacities. Here, we report the use of an electrochemical approachdepth of discharge test -to separate the charge-discharge capacities of crystalline silicon electrodes into four contributions: (1) SEI formation, (2) lithium accommodation in carbon and binder, (3) lithiation and delithiation of the Si active material, and (4) capacity loss associated with particle cracking and isolation. We find that the intrinsic coulombic efficiency for the crystalline-to-amorphous transition of Si during initial cycle is about 90%, which is independent of particle size. SEI formation is estimated to be about 10 mAh per square meters of active material surface and scales with BET surface area. Mechanical issues and particle isolation are observed in fully discharged electrode when the amount of binder is less than 20%. Capacity limitation prolongs lifetime of Si electrode, but the overall performance is governed by the coulombic efficiency (CE) during cycle. Low CE is due to continual SEI formation with cycling, increase utilization of Si upon cycling, trapping of Li in the material and mechanical failure of the electrode. Silicon has received much attention as a next-generation anode material for lithium-ion battery (LIB) because it can alloy with Li electrochemically with a theoretical capacity of ∼3572 mAh g −1 , corresponding to the formation of Li 15 Si 4 .1,2 Typically, silicon electrodes show poor cycle performance, which is typically attributed to the large volume expansion during lithiation, pulverization of the active material, continuous solid electrolyte interphase (SEI) layer growth, etc. 3-8Advanced imaging and characterizations such as transmission electron microscopy (TEM), nuclear magnetic resonance (NMR), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), timeof-flight secondary ion mass spectrometry (TOF-SIMS) and in-situ dilatometry have helped scientists understand the underlying physical and mechanical interactions, as well as the chemical reactions in silicon electrodes during charge and discharge.9-13 Though, eventually, it is the capacities that can be obtained from charge and discharge in each cycle, and how they can be sustained for a large number of cycles, that matters the most for battery applications. In this respect, there are hardly any studies that are able to tell how much of the measured capacity comes from different processes that are occurring in an electrode. The aim of this study is therefore to establish a method to understand and quantify the contributions to the reversible and irreversible capacities of silicon anodes during the initial cycle and subsequent cycles in order to develop strategies to improve the stability of the electrodes.In this paper, we report the use of an electrochemical approachdepth of discharge test -to separate the charge-discharge capacities of crystal...

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Enhanced electrochemical properties of a Si-based anode using an electrochemically active polyamide imide binder

Cited by 149 publications

References 14 publications

Recent Progress on Polymeric Binders for Silicon Anodes in Lithium-Ion Batteries

Recent Progress on Polymeric Binders for Silicon Anodes in Lithium-Ion Batteries

Unveiling the Roles of Binder in the Mechanical Integrity of Electrodes for Lithium-Ion Batteries

Insights from Studying the Origins of Reversible and Irreversible Capacities on Silicon Electrodes

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