Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

Naboka, Olga; Yim, Chae-Ho; Abu-Lebdeh, Yaser

doi:10.1016/j.mseb.2016.04.003

Cited by 10 publications

(11 citation statements)

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“…The concentration of graphene in the supernatant obtained after centrifugation was measured to be 1.42 mg/mL for graphite exfoliated in water solution of MC and 2.6 mg/mL for graphite exfoliated in acetone solution of EC. The value for MC is close to that obtained for sonication-assisted exfoliation of graphite in NaCMC (1.36 mg/mL) reported by us previously . Concentration of graphene obtained after exfoliation in EC solution is almost 2 times higher than that in MC solution under the same sonication condition.…”

Section: Results and Discussionsupporting

confidence: 88%

“…Such modification however does not necessarily mean good compatibility with Si nanomaterials since pitch-derived carbon is expected to be highly hydrophobic too, so new graphitic materials that are suitable to be used together with Si should be developed. In a previous work, we modified graphite with graphene layers by liquid exfoliation of graphite in Na carboxymethyl cellulose (NaCMC) solutions and it enhanced the capacity of Si nanopowder . In the composite, graphene was assumed to form a conductive network, which was able to accommodate volume changes of silicon during cycling.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, effective graphene formation and its stabilization by cellulose derivatives are known to yield carbon with high oxygen content , (so-called “hard carbon”), which is expected to favor van der Waals interactions with Si nanoparticles. However, even though NaCMC proved to be an excellent graphite exfoliant, it was not selected in the present work since Na 2 CO 3 forms during heat treatment of NaCMC, which is undesirable for application in Li-ion battery anodes. Instead, nonionic cellulose derivativesmethylcellulose (MC) and ethylcellulose (EC), were applied in this work.…”

Section: Introductionmentioning

confidence: 99%

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Practical Approach to Enhance Compatibility in Silicon/Graphite Composites to Enable High-Capacity Li-Ion Battery Anodes

2021

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There is an urgent need to improve the energy density of Li-ion batteries to enable mass-market penetration of electric vehicles, grid-scale energy storage, and next-generation consumer electronics. Silicon–graphite composites are currently the most plausible anode material to overcome the capacity limit of graphite or poor cycling performance of silicon. One serious and unrecognized limitation to the use of the composite as an anode is the incompatibility of hydrophobic (natural) graphite with the hydrophilic Si, which adversely affects battery performance. Herein, we report a novel, practical approach to modify the graphite resulting in the formation of a hard carbon coating and graphene sheets that give rise to higher compatibility with Si nanoparticles in the composite. Electrochemical and battery testing of the composite (10 wt % Si) anode shows higher reversible capacity (10% at C/12 and 20% at C/2) than the composite with unmodified graphite reaching ∼600 mAh/g with 95% retention after 100 cycles. The enhanced battery performance is explained by the uniform distribution of Si nanoparticles at the modified graphite surface due to the presence of graphene conductive networks and a thin, oxygen-rich, amorphous carbon layer on the surface of graphite particles, as evidenced by transmission electron microscopy (TEM) images and X-ray photoelectron spectra (XPS). This work provides a new approach to prepare graphite compatible materials that can work with hydrophilic components other than silicon for various applications other than batteries.

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Section: Results and Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Practical Approach to Enhance Compatibility in Silicon/Graphite Composites to Enable High-Capacity Li-Ion Battery Anodes

2021

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“…The peak of CC group shifts to 1632 cm −1 , indicating that π–π stacking occurs between GO layers. The adsorption band of CO stretching vibration shifts to 1731 cm −1 , showing that the strong hydrogen bonding interaction occurs between GO and CMC [20–25]. Compared with rGO‐CMC‐3, the adsorption peak strength of CO stretching vibration increases significantly after adsorption of Pb(II) by adsorbent, indicating that strong chelation interaction occurs between carboxyl groups and Pb(II) [10].…”

Section: Resultsmentioning

confidence: 99%

“…In order to further investigate the adsorption mechanism of rGO-CMC composite, the GO, CMC and rGO-CMC-3 before and after adsorption of Pb(II) were characterized by FT-IR and XPS. As displayed in Figure 7(a), the adsorption peaks of GO at 3420, 1741, 1621 and 1109 cm showing that the strong hydrogen bonding interaction occurs between GO and CMC [20][21][22][23][24][25]. Compared with rGO-CMC-3, the adsorption peak strength of C O stretching vibration increases significantly after adsorption of Pb(II) by adsorbent, indicating that strong chelation interaction occurs between carboxyl groups and Pb(II) [10].…”

Section: Adsorption Mechanismmentioning

confidence: 95%

Facile fabrication of sodium carboxymethyl cellulose/reduced graphene oxide composite hydrogel and its application for Pb(II) removal

Zhang

Huang

et al. 2020

Micro & Nano Letters

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Heavy metals ions in water have attracted close attention due to their toxicity, non-biodegradability and carcinogenicity [1]. Because lead ions are more harmful to the human body and tend to accumulate in the body, their removal from wastewater is necessary [2]. Adsorption method was extensively used to remove/recover toxic metal ions, owing to its low cost, convenient operation, no secondary pollution and diversified nature [3-5]. Most conventional adsorbents are in powder form, which makes it difficult to collect after adsorption. Graphene and its derivative have become widely used for functional materials [6, 7]. Graphene oxide (GO) with plenty of reactive functional groups including hydroxyl, carboxyl and epoxy groups is obtained by strong oxidation and stripping of graphite. Abundant oxygen-containing functional groups can be used as active sites to adsorb heavy metals. Therefore, GO can be widely used in the field of heavy metal adsorption [8, 9]. However, due to the presence of a large number of hydrophilic groups, GO has good hydrophilicity, which makes it difficult to be separated and recycled after adsorption [10, 11]. Therefore, it is necessary to further modify the GO. It is expected to assemble three-dimensional (3D) aerogels by combining GO with chain-like biomass molecules or polymers. Sodium carboxymethyl cellulose (CMC), a hydrosoluble anion linear biopolymer and semi-synthetic derivative of cellulose, is obtained by substituting the 2,3,6-hydroxyl groups of cellulose with a carboxymethyl moiety [12]. Because of its low cost, nontoxic, renewable, biodegradable and modifiable characteristics, CMC is considered a biocompatible material and can be used for drug delivery and tissue engineering. And the CMC aqueous solution still has high viscosity at low concentration, it is widely used as an adhesive in industry. It is also an effective adsorbent for removing metal ions because it contains many active functional groups, including hydroxyl and carboxyl groups that can chelate metal ions and interact with organic compounds. However, it has weak mechanical properties. Therefore, it is difficult to directly assemble GO and CMC to form aerogels with strong mechanical properties. Recent work has demonstrated that during AA reduction of graphene oxide, some oxygen-containing This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Studies on sodium carboxymethyl cellulose + sodium triflate polymer electrolyte

Gupta,

Rai

2023

Energy Storage

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This paper presents the effect of salt concentration on the electrochemical, thermal, and structural properties of the solid polymer electrolyte (SPE) prepared with the polymer sodium carboxymethylcellulose (NaCMC) and the salt sodium triflate (NaCF3SO3). The electrolyte was prepared in the form of membranes using solution cast technique. Deionized water was used as a common solvent for both the precursor materials. The membranes were characterized using electrochemical impedance spectroscopy (EIS), Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and differential scanning calorimetry (DSC). XRD results show reduction in crystallinity of the electrolyte with an increase in the salt concentration. The FTIR result confirms polymer‐salt interaction. The ionic conductivity of the electrolyte membrane was found to be dependent on the concentration of NaCF3SO3. The maximum ionic conductivity of the SPE membranes was observed to be 1 × 10−4 Scm−1 at room temperature (36°C). DSC results show an increase in glass transition temperature (Tg) with increasing salt concentration. The total ionic transference number of the highest conducting sample was found to be ~1, which shows that the conductivity of SPE membranes is predominantly due to the transport of ions.

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Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

Cited by 10 publications

References 58 publications

Practical Approach to Enhance Compatibility in Silicon/Graphite Composites to Enable High-Capacity Li-Ion Battery Anodes

Practical Approach to Enhance Compatibility in Silicon/Graphite Composites to Enable High-Capacity Li-Ion Battery Anodes

Facile fabrication of sodium carboxymethyl cellulose/reduced graphene oxide composite hydrogel and its application for Pb(II) removal

Studies on sodium carboxymethyl cellulose + sodium triflate polymer electrolyte

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