Azo-linked covalent triazine-based framework as organic cathodes for ultrastable capacitor-type lithium-ion batteries

Wu, Chuanguang; Hu, Mingjun; Yan, Xiaorong; Shan, Guangcun; Liu, Jinzhang; Yang, Jun

doi:10.1016/j.ensm.2021.01.016

Cited by 99 publications

(91 citation statements)

References 38 publications

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“…Upon recharging, the relative intensity returned to its original state. These results clearly showed the transformation from C═N double bonds to C N single bonds with voltage at about 1.2 V. It has been reported 34,[39][40][41] that the triazine ring is electrochemical reactive and it may accept one electron; and hence the third electron may be originated from the redox reaction of triazine rings.…”

Section: Storage Mechanismmentioning

confidence: 58%

A novel conjugated porous polymer based on triazine and imide as cathodes for sodium storage

Dai

Zou

Gao

et al. 2021

Journal of Polymer Science

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Organic electrode materials have attracted more and more attention for sodium-ion batteries (SIBs) that are regarded as one of the most promising alternatives of lithium-ion batteries, because they can endure the storage of large sodium ions (with a larger radius than that of lithium ions) without obvious volume change. Herein, we report a novel conjugated porous polymer (TPIP) based on triazine and imide as cathodes material for SIBs. TPIP has abundant redox-active sites, good thermal stability (400 C) and large specific surface area (306 m 2 g À1 ). As a result, TPIP electrode delivered a specific capacity of 120 mAh g À1 after 50 cycles at a current density of 0.1 A g À1 and 85 mAh g À1 after 150 cycles at a current density of 1.0 A g À1 . Ex-situ X-ray photoelectron spectra and Fourier transform infrared spectra showed that the TPIP electrodes reversibly stored three sodium ions per unit through the triazine rings and half of the carbonyl groups. These results deepen our understanding of charge storage mechanisms of polymers with triazine and imide units and will provide guidance for the future design of electrode materials for high-performance SIBs.

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Section: Storage Mechanismmentioning

confidence: 58%

A novel conjugated porous polymer based on triazine and imide as cathodes for sodium storage

Dai

Zou

Gao

et al. 2021

Journal of Polymer Science

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“…Generally speaking, the dynamic characteristics of battery electrode materials can be judged according to the b value, b=0.5 indicates an electrochemical system dominated by a semi‐infinite diffusion process. When the b value is closer to 1, the electrochemical process is dominated by capacitive behavior [14] . Plot the peak current ( i ) and scan rate ( ν ) logarithmic graph can get a slope, this is the b value (Figure 4b).…”

Section: Resultsmentioning

confidence: 98%

“…When the b value is closer to 1, the electrochemical process is dominated by capacitive behavior. [14] Plot the peak current (i) and scan rate (ν) logarithmic graph can get a slope, this is the b value (Figure 4b). The b values calculated according to the formula are 0.79 and 0.88, suggesting the capacity contribution is not dominated by diffusion.…”

Section: Resultsmentioning

confidence: 99%

Carbonyl‐rich Poly(pyrene‐4,5,9,10‐tetraone Sulfide) as Anode Materials for High‐Performance Li and Na‐Ion Batteries

Han

et al. 2021

Chemistry An Asian Journal

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Organic carbonyl electrode materials are widely employed for alkali metal-ion secondary batteries in terms of their sustainability, structure designability and abundant resources. As a typical redox-active organic electrode materials, pyrene-4, 5, 9, 10-tetraone (PT) shows high theoretical capacity due to the rich carbonyl active sites. But its electrochemical behavior in secondary batteries still needs further exploration. Herein, PT-based linear polymers (PPTS) is synthesized with thioether bond as bridging group and then employed as an anode material for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). As expected, PPTS shows improved conductivity and insolubility in the non-aqueous electrolyte. When used as an anode material for LIBs, PPTS delivers a high reversible specific capacity of 697.1 mAh g À 1 at 0.1 A g À 1 and good rate performance (335.4 mAh g À 1 at 1 A g À 1 ). Moreover, a reversible specific capacity of 205.2 mAh g À 1 at 0.05 A g À 1 could be obtained as an anode material for SIBs.

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“…Notably, as the current increased from 1 to 5 A g −1 , the capacities of TP‐TA COF decay only slightly, and it can deliver a high reversible capacity of 129 mA h g −1 even at a high current density of 5 A g −1 , which is superior to many previous related reports (Figure S11, Table S3, Supporting Information). [ 4c,9a,13,21 ] The corresponding power density can be as high as 14.5 kW kg −1 (Figures S12,S13, Supporting Information). The remarkable rate performance of TP‐TA COF convincingly demonstrates the advantages of its morphology.…”

Section: Resultsmentioning

confidence: 99%

Chemical Design for Both Molecular and Morphology Optimization toward High‐Performance Lithium‐Ion Batteries Cathode Material Based on Covalent Organic Framework

Yang

Zhao

et al. 2021

Adv Funct Materials

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In most cases, to obtain high‐performance electrode materials for lithium‐ion batteries (LIBs), it is necessary to optimize both their molecular structure and morphology. Normally, the molecular structure of covalent organic frameworks (COFs) can be well engineered by chemical design, while their morphology is mainly optimized by post‐processing. Herein, by introducing a flexible building unit containing sp3 N redox‐active centers, a bipolar‐type TP‐TA COF assembled by uniform 2D hexagonal nanosheets is synthesized in a one‐step reaction without any post‐processing, achieving the highly challenging simultaneous optimization of both molecular structure and morphology required for high‐performance electrode materials. Thus, when used as cathode material for LIBs, its combined optimized chemical structure and favorable morphology of TP‐TA COF synergistically render a high capacity (207 mA h g−1 at 200 mA g−1), excellent rate performance (129 mA h g−1 at 5.0 A g−1), and cycling stability (93% capacity retention after 1500 cycles at 5.0 A g−1).

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Azo-linked covalent triazine-based framework as organic cathodes for ultrastable capacitor-type lithium-ion batteries

Cited by 99 publications

References 38 publications

A novel conjugated porous polymer based on triazine and imide as cathodes for sodium storage

A novel conjugated porous polymer based on triazine and imide as cathodes for sodium storage

Carbonyl‐rich Poly(pyrene‐4,5,9,10‐tetraone Sulfide) as Anode Materials for High‐Performance Li and Na‐Ion Batteries

Chemical Design for Both Molecular and Morphology Optimization toward High‐Performance Lithium‐Ion Batteries Cathode Material Based on Covalent Organic Framework

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