Influence of Binder on Impedance of Lithium Batteries: A Mini-review
TL;DR: In this paper, the influencing factors of the impedance variation during charging and discharging processes and the influence of various binders on the impedance performance of lithium-ion batteries are reviewed.
Abstract: As an integral component of electrodes, binder is one of the key factors for improving of the performance and prolonging the service life of lithium batteries. To predict the service life of lithium batteries, observing the impedance evolution of batteries during the cycling process has been considered as a promising strategy. Electrochemical impedance spectroscopy as an effective measurement has been applied in numerous studies to explore the impedance behavior of lithium batteries. Therefore, this paper reviews the influencing factors of the impedance variation during charging and discharging processes and the influence of various binders on the impedance performance of lithium-ion batteries. Moreover, an outlook is proposed for the modification of binders to improve the performance of lithium-ion batteries.
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TL;DR: In this paper , xanthan gum (XG) with double-helix structure has been investigated as a novel aqueous binder to improve the electrochemical performance of Li[Li 0.2Co0.13Ni 0.13Mn 0.54]O2.
Abstract: Lithium-rich manganese-based cathode materials have the advantages of high specific capacity and operating voltage, but they still pose some problems such as poor cycle performance and serious voltage fading. Here, xanthan gum (XG) with double-helix structure has been investigated as a novel aqueous binder to improve the electrochemical performance of Li[Li0.2Co0.13Ni0.13Mn0.54]O2. When the mass proportion of XG is 5%, the prepared lithium-rich cathode shows the highest specific capacity and best cycle stability. After cycling, the discharge voltage of the lithium-rich cathode decreases by only 273 mV, indicating that XG can effectively inhibit the voltage fading of the lithium-rich material.
1 citations
TL;DR: In this article , the authors provide a clear insight on the study of boron in energy storage materials and contribute to the promotion of further research in this area, aiming to understand the hybrid forms of BORON and their potential for use in lithium battery materials.
Abstract: With the development of energy storage technology, the demand for high energy density and high security batteries is increasing, making the research of lithium battery (LB) technology an extremely important pursuit. However, the poor structural stability of electrode materials, high interfacial impedance between electrolyte and electrode, and the growth of lithium dendrites have seriously hindered the commercialization of LBs. Recently, due to their unique electronic structures and hybrid forms, boron‐based materials have been widely used in different LB components, such as electrodes, electrolytes, separators, additives, and binders, to resolve these problems. Here, a basic understanding of boron and boron‐based materials is first introduced. Subsequently, the recent research progress on the application of boron in each component of the LB is summarized, aiming to understand the hybrid forms of boron and their potential for use in LB materials. Finally, some new strategies and perspectives on the application of boron in LB materials are proposed. Here, the aim is to provide a clear insight on the study of boron in energy storage materials and contribute to the promotion of further research in this area.
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TL;DR: Recent progress and well-developed strategies in research designed to accomplish flexible and stretchable lithium-ion batteries and supercapacitors are reviewed.
Abstract: Energy-storage technologies such as lithium-ion batteries and supercapacitors have become fundamental building blocks in modern society. Recently, the emerging direction toward the ever-growing market of flexible and wearable electronics has nourished progress in building multifunctional energy-storage systems that can be bent, folded, crumpled, and stretched while maintaining their electrochemical functions under deformation. Here, recent progress and well-developed strategies in research designed to accomplish flexible and stretchable lithium-ion batteries and supercapacitors are reviewed. The challenges of developing novel materials and configurations with tailored features, and in designing simple and large-scaled manufacturing methods that can be widely utilized are considered. Furthermore, the perspectives and opportunities for this emerging field of materials science and engineering are also discussed.
892 citations
TL;DR: Silicon nanoparticle-based lithium-ion battery negative electrodes where multiple nonactive electrode additives are replaced with a single conductive binder, in this case, the conducting polymer PEDOT PSS are described.
Abstract: This work describes silicon nanoparticle-based lithium-ion battery negative electrodes where multiple nonactive electrode additives (usually carbon black and an inert polymer binder) are replaced with a single conductive binder, in this case, the conducting polymer PEDOT:PSS. While enabling the production of well-mixed slurry-cast electrodes with high silicon content (up to 95 wt %), this combination eliminates the well-known occurrence of capacity losses due to physical separation of the silicon and traditional inorganic conductive additives during repeated lithiation/delithiation processes. Using an in situ secondary doping treatment of the PEDOT:PSS with small quantities of formic acid, electrodes containing 80 wt % SiNPs can be prepared with electrical conductivity as high as 4.2 S/cm. Even at the relatively high areal loading of 1 mg/cm2, this system demonstrated a first cycle lithiation capacity of 3685 mA·h/g (based on the SiNP mass) and a first cycle efficiency of ∼78%. After 100 repeated cycles a...
369 citations
350 citations
TL;DR: In this paper, the dependence of the internal resistance of porous electrodes with high loading weight on thickness was systematically investigated using a combination of electrochemical impedance spectroscopy with symmetric cells and the transmission line model for cylindrical pores.
Abstract: To understand the relationship between the specific energy and power of lithium (Li)-ion batteries, the dependence of the internal resistance of porous electrodes with high loading weight on thickness was systematically investigated. The ionic resistance in pores (Rion) and charge-transfer resistance for Li intercalation (Rct) normalized per unit electrode geometric area were assessed using a combination of electrochemical impedance spectroscopy with symmetric cells and the transmission line model for cylindrical pores. The changes of Rion and Rct and their magnitude show opposite trends with respect to electrode thickness. For thin electrodes, Rion is lower than Rct. The specific power decreases slightly as the electrodes become thicker because the total internal resistance is predominantly affected by the charge-transfer resistance, and there is no delay of the response in the depth direction. In contrast, for thick electrodes, Rion is higher than or approximately equal to Rct, so there is a delay of th...
276 citations
TL;DR: In this paper, a novel polymer binder that possesses high ion as well as electron conductivities suitable for high-performance Si anodes is designed and demonstrated, and the binder is prepared by assembling ion-conductive polyethylene oxide (PEO) and polyethylenimine (PEI) onto the electronconductive PEDOT:PSS chains via chemical crosslinking, chemical reduction, and electrostatic self-assembly.
Abstract: DOI: 10.1002/aenm.201702314 the conductive additives may lose electric contact with Si. To address this issue, conducting polymers, which have dual functions as a binder and conducting additive, have been developed for Si anodes. The conducting polymers provide good electron transport during cycling[13–20] and volume contraction in the Si-based electrode. For example, Liu et al.[13] reported that a polyfluorene-based conducting polymer with improved electron conductivity and robust mechanical binding force contributes to remarkable rate performance and good cycling stability of the Si anode. Among the conducting polymers, poly(3,4-ethylenedioxythiophene) (PEDOT) can have a high conductivity up to 1000 S cm−1 and is easy to processing.[21,22] The PEDOT has been adopted as a part of the Si anode composites to enhance the electronic conductivity and cycling performance by in situ polymerization of 3,4-ethylenedioxythiophene (EDOT) with the Si[23–26] or mixing the water-based PEDOT:PSS dispersion with the Si and other components (where PSS is poly (styrenesulfonate)).[18,27–30] Beside the electron transport, ion conductivity in the binder also significantly influences the performance of the Si anode.[31–33] The binder is required to provide rapid access for lithium-ion (Li-ion) to transport between the Si surface and the binder to achieve high-performance Si anode. Recently, Salem et al.[33] reported that they could improve the rate performance of anodes via enhancing the ion conductivity of the poly(thiophene) conductive polymer binder by attaching ionic alkyl carboxylate groups. However, the electron conductivity of the poly(thiophene) is still limited (<10−2 S cm−1). Therefore, increasing the ion conductivity of the highly electronconductive (up to 103 S cm−1) PEDOT:PSS will be a promising strategy to achieve efficient conductive polymer binders for high-performance silicon anodes. Herein, a novel polymer binder that possesses high ion as well as electron conductivities suitable for high-performance Si anodes is designed and demonstrated. The binder is prepared by assembling ion-conductive polyethylene oxide (PEO)[34] and polyethylenimine (PEI)[35] onto the electron-conductive PEDOT:PSS chains via chemical crosslinking, chemical reduction, and electrostatic self-assembly. The polymer binder possesses superior lithium-ion and electron transport properties that are 14 and 90 times higher than those of the widely used carboxymethyl cellulose (CMC) (with acetylene black) binder Polymer binders with high ion and electron conductivities are prepared by assembling ionic polymers (polyethylene oxide and polyethylenimine) onto the electrically conducting polymer poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) chains. Crosslinking, chemical reductions, and electrostatics increase the modulus of the binders and maintain the integrity of the anode. The polymer binder shows lithium-ion diffusivity and electron conductivity that are 14 and 90 times higher than those of the widely used carboxymethyl cellulose (with acetylene black) binder, respectively. The silicon anode with the polymer binder has a high reversible capacity of over 2000 mA h g−1 after 500 cycles at a current density of 1.0 A g−1 and maintains a superior capacity of 1500 mA h g−1 at a high current density of 8.0 A g−1.
236 citations