Covalently Functionalized Graphene by Radical Polymers for Graphene-Based High-Performance Cathode Materials

Li, Yongjun; Zukai, Jian; Lang, Meidong; Zhang, Chunming; Huang, Xiaoyu

doi:10.1021/acsami.6b05271

Cited by 97 publications

(74 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, an organic nanohybrid of lumiflavine (LF) and single‐walled carbon nanotubes (SWNTs) was reported as a free‐standing cathode with a high gravimetric energy density of up to 500 Wh kg −1 during a 25 min discharge . Alternatively, a composite material based on radical polymer‐ graft ‐functionalized graphene sheets (G‐ g ‐PTMA) and reduced graphene oxide (RGO) showed a high specific capacity of 466 mAh g −1 at a low current density of 0.2 A g −1 and a good rate performance as high as 228 mAh g −1 at a high current rate of 20.0 A g −1 . Unfortunately, a large amount of conductive carbon additives were used in the aforementioned examples, that is, almost 60 wt % of SWNTs in LF/SWNT and 85 wt % of graphene or RGO in G‐ g ‐PTMA/RGO, which significantly reduced the energy density of the batteries.…”

Section: Introductionsupporting

confidence: 73%

“…[43] Alternatively,ac omposite material based on radical polymer-graft-functionalized graphene sheets (G-g-PTMA) and reduced graphene oxide (RGO) showedahigh specific capacity of 466 mAh g À1 at al ow current density of 0.2 Ag À1 and ag ood rate performance as high as 228 mAh g À1 at ah igh current rate of 20.0 Ag À1 . [44] Unfortunately,alarge amount of conductive carbon additives were used in the aforementioned examples, that is, almost 60 wt %o fS WNTsi nLF/SWNT and 85 wt %o fg raphene or RGO in G-g-PTMA/RGO, which significantly reduced the energy density of the batteries. When the loading of RGO was decreased to approximately 20 wt %i nt hree-dimensional graphene/polyimide composites (3D-RGO/PI), the capacity was only 175 mAh g À1 at al ow charge-discharge rate of 0.1C, which further decreased to less than 40 mAh g À1 when the rate was increasedt o5 C. [45] Therefore, how to achieve exceptional electrochemical performance with minimum utilization of electronically conductive carbon additives is still ac hallenge in the research of organic electrodes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aromatic Polyimide/Graphene Composite Organic Cathodes for Fast and Sustainable Lithium‐Ion Batteries

Lyu

Liu

et al. 2018

ChemSusChem

View full text Add to dashboard Cite

A composite organic cathode material based on aromatic polyimide (PI) and highly conductive graphene was prepared through a facile in situ polymerization method for application in lithium-ion batteries. The in situ polymerization generated intimate contact between PI and electronically conductive graphene, resulting in conductive composites with highly reversible redox reactions and good structure stability. The synergistic effect between PI and graphene enabled not only a high reversible capacity of 232.6 mAh g at a charge-discharge rate of C/10 but also exceptionally high-rate cycling stability, that is, a high capacity of 108.9 mAh g at a very high charge-discharge rate of 50C with a capacity retention of 80 % after 1000 cycles. This improved electrochemical performance resulted from the combination of stable redox reversibility of PI and high electronic conductivity of the graphene additive. The graphene-based composite also exhibited much better performance than composites based on multi-walled carbon nanotubes and the conductive carbon black C45 in terms of specific capacity and long-term cycling stability under the same charge-discharge rates.

show abstract

Section: Introductionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Aromatic Polyimide/Graphene Composite Organic Cathodes for Fast and Sustainable Lithium‐Ion Batteries

Lyu

Liu

et al. 2018

ChemSusChem

View full text Add to dashboard Cite

show abstract

“…Charge and discharge do not reduce battery performance, among other advantages [6,7]. Various organic molecules have been examined toward obtaining organic-based electrodes, such as conducting polymers, electron-donor/acceptor molecules, metal-clusters, and organic radical molecules [8][9][10]. Radical polymers are composed of non-conjugated carbon backbones that contain pendant groups bearing reversible redox products of radical species The synthesis route to poly(TAm-co-SSS) and PTAm.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a TEMPO-Substituted Polyacrylamide Bearing a Sulfonate Sodium Pendant and Its Properties in an Organic Radical Battery

Zhu

Tuo

et al. 2019

Polymers

View full text Add to dashboard Cite

A novel nitroxyl radical polymer poly(TEMPO-acrylamide-co-sodium styrene sulfonate) (abbreviated as poly(TAm-co-SSS)) was synthesized using 4-acrylamido-2,2,6,6tetramethylpiperidine (AATP) copolymerized with styrene sulfonate sodium (SSS). AATP was synthesized through a substitution reaction of acryloyl chloride. Meanwhile, poly(4-acrylamido-2,2,6,6-tetramethylpiperidine-1-nitroxyl radical) (PTAm) was prepared as a control sample. Then, the structures of products were characterized by nuclear magnetic resonance spectroscopy ( 1 H-NMR), Fourier transform infrared spectroscopy (FT-IR), high performance liquid chromatography-mass spectrometry (HPLC-MS), differential scanning calorimetry (DSC), X-Ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR), respectively. Additionally, the electrochemical impedance spectra (EIS) and the charge-discharge cycling properties were studied. The results demonstrated that the poly(TAm-co-SSS) with the side group of sodium sulfonate adjacent to TEMPO group exhibits a better charge-discharge cycling stability than that of the PTAm. Moreover, the charge specific capacity of the poly(TAm-co-SSS) is larger than that of the PTAm. Besides, the first coulombic efficiency of poly(TAm-co-SSS) is higher in comparison with that of PTAm. These superior electrochemical performances were ascribed to the synergistic effect of sulfonate ions group and nitroxyl radical structure, which benefits the improvement of charge carrier transportation of the nitroxyl radical polymers. Consequently, the nitroxyl radical poly(TAm-co-SSS) is promising for use in organic radical battery materials, based on the good electrochemical properties. such as nitroxide, phenoxyl, and galvinoxyl radicals. Due to the fact that radical polymers are completely amorphous and lack π-conjugation, charge transport occurs locally and through a reversible oxidation-reduction (redox) reaction mechanism, the radical polymers are expected to become a new generation of electrode materials [11,12].As a typical radical polymer, poly(4-acrylamido-2,2,6,6-tetramethylpiperidine-1-nitroxyl radical) (PTAm) indicates that it can be used as a novel, metal-free cathode material or long-period rechargeable devices [13,14]. Moreover, the stable amphoteric nitroxide block copolymers which were synthesized by block copolymerization were promising to be used as the EPR probes for bioimaging in vivo [15]. The electrochemical properties of the PTAm have been studied to confirm its potential for application in new electrode materials [16,17]. However, although good cyclability was usually reported [18][19][20], the TEMPO-substituted polyacrylamide was generally soluble in the electrolyte, leading to loss of capacity over time [21]. Crosslinking of the polymer was then a suitable option to improve the charge-discharge cycling stability [22]. In order to improve electrical properties of organic electronic polymers as electrode materials, ion-bearing repeat units were intentionally added to the macromolecular architecture of PTMA...

show abstract

“…Another way to decrease the solubility of the active material is to use cross-linked PTMA, creating a polymer network [12][13][14] or to graft PTMA on the conductive material. [12,[15][16][17] Non-covalent interactions between PTMA and the conductive material have also been considered with imidazolium [18] (cation-p interaction) and pyrene [19] (p-p stacking) as anchoring points to immobilize PTMA onto nanostructured carbon derivatives. Zhang et al recently reported a noncovalent interaction between a pyrene-functionalized PTMA and reduced graphene oxide (rGO).…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Batteries by Using Multi‐Pyrene PTMA Structures

Hergué

Ernould

Minoia

et al. 2018

Batteries & Supercaps

View full text Add to dashboard Cite

Well‐defined pyrene‐based poly(2,2,6,6‐tetramethylpiperidinyloxy‐4‐yl methacrylate) (PTMA) (co)polymers have been synthesized and combined with multi‐wall carbon nanotubes (CNTs) as electrode material for organic radical batteries. The influence of the number of pyrene pendent groups on the electrochemical response of the nanocomposite materials has been assessed, focusing on the capacity retention upon charge/discharge cycling and on the cycling rate. In parallel, the interactions between the polymethacrylate chains and the CNT surface have been investigated with molecular modeling techniques, to shed light on the nature and stability of the functionalized PTMA/CNT interface.

show abstract

Covalently Functionalized Graphene by Radical Polymers for Graphene-Based High-Performance Cathode Materials

Cited by 97 publications

References 38 publications

Aromatic Polyimide/Graphene Composite Organic Cathodes for Fast and Sustainable Lithium‐Ion Batteries

Aromatic Polyimide/Graphene Composite Organic Cathodes for Fast and Sustainable Lithium‐Ion Batteries

Synthesis of a TEMPO-Substituted Polyacrylamide Bearing a Sulfonate Sodium Pendant and Its Properties in an Organic Radical Battery

Improving the Performance of Batteries by Using Multi‐Pyrene PTMA Structures

Contact Info

Product

Resources

About