Bipolar nitrogen-doped graphene frameworks as high-performance cathodes for lithium ion batteries

Huang, Yanshan; Wu, Dongqing; Dianat, Arezoo; Bobeth, M.; Huang, Tao; Mai, Yiyong; Zhang, Fan; Cuniberti, Gianaurelio; Feng, Xinliang

doi:10.1039/c6ta09161j

Cited by 22 publications

(14 citation statements)

References 61 publications

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“…For NC@GF‐600 electrodes, the values of the charge‐transfer resistance ( R ct ) and ohmic resistance ( R f ) were 50.32 and 0.01 Ω, respectively, which are significantly lower than those of NC@GF‐500 (60.24 and 0.03 Ω) and NC@GF‐700 (69.95 and 0.02 Ω). This result confirmed that the 3D graphene framework coupled with ultrathin carbon‐coating layer containing high‐level pyridinic N should be responsible for the high conductivity of NC@GF‐600 and thus greatly enhance the rapid electron/ion transportation during the electrochemical lithium insertion/extraction reaction …”

Section: Resultsmentioning

confidence: 52%

Ultrathin Nitrogen‐Doped Carbon Layer Uniformly Supported on Graphene Frameworks as Ultrahigh‐Capacity Anode for Lithium‐Ion Full Battery

Huang

Yang

et al. 2018

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The designable structure with 3D structure, ultrathin 2D nanosheets, and heteroatom doping are considered as highly promising routes to improve the electrochemical performance of carbon materials as anodes for lithium-ion batteries. However, it remains a significant challenge to efficiently integrate 3D interconnected porous frameworks with 2D tunable heteroatom-doped ultrathin carbon layers to further boost the performance. Herein, a novel nanostructure consisting of a uniform ultrathin N-doped carbon layer in situ coated on a 3D graphene framework (NC@GF) through solvothermal self-assembly/polymerization and pyrolysis is reported. The NC@GF with the nanosheets thickness of 4.0 nm and N content of 4.13 at% exhibits an ultrahigh reversible capacity of 2018 mA h g at 0.5 A g and an ultrafast charge-discharge feature with a remarkable capacity of 340 mA h g at an ultrahigh current density of 40 A g and a superlong cycle life with a capacity retention of 93% after 10 000 cycles at 40 A g . More importantly, when coupled with LiFePO cathode, the fabricated lithium-ion full cells also exhibit high capacity and excellent rate and cycling performances, highlighting the practicability of this NC@GF.

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Section: Resultsmentioning

confidence: 52%

Ultrathin Nitrogen‐Doped Carbon Layer Uniformly Supported on Graphene Frameworks as Ultrahigh‐Capacity Anode for Lithium‐Ion Full Battery

Huang

Yang

et al. 2018

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“…This suggests significant redox contribution from the GA radical sites [48] and N-doped centers. [68] The fraction of the diffusion-limited current, most likely linked to the redox process from GA surfaces, decreased to 30% when the scan rate increased to 2.0 mV s −1 (Figure 3d). The same analysis performed for a freshly assembled half-cell (Figure S12a-c, Supporting Information) showed similar electrochemical performance but with a higher fraction of diffusion-limited processes at each potential sweep rate.…”

Section: Resultsmentioning

confidence: 99%

“…The first one corresponds to lithiation-delithiation of the sp 2 graphene moieties of GA. The second is a typical region for carboxylate redox reactions; [9] the third could be regarded as redox-processes involving nitrogencontaining graphene moieties [68] introduced during the synthesis (Figures S3 and S4, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Graphene Acid for Lithium‐Ion Batteries—Carboxylation Boosts Storage Capacity in Graphene

Obraztsov

Bakandritsos

Šedajová

et al. 2021

Advanced Energy Materials

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Environmentally sustainable, low‐cost, flexible, and lightweight energy storage technologies require advancement in materials design in order to obtain more efficient organic metal‐ion batteries. Synthetically tailored organic molecules, which react reversibly with lithium, may address the need for cost‐effective and eco‐friendly anodes used for organic/lithium battery technologies. Among them, carboxylic group‐bearing molecules act as high‐energy content anodes. Although organic molecules offer rich chemistry, allowing a high content of carboxyl groups to be installed on aromatic rings, they suffer from low conductivity and leakage to the electrolytes, which restricts their actual capacity, the charging/discharging rate, and eventually their application potential. Here, a densely carboxylated but conducting graphene derivative (graphene acid (GA)) is designed to circumvent these critical limitations, enabling effective operation without compromising the mechanical or chemical stability of the electrode. Experiments including operando Raman measurements and theoretical calculations reveal the excellent charge transport, redox activity, and lithium intercalation properties of the GA anode at the single‐layer level, outperforming all reported organic anodes, including commercial monolayer graphene and graphene nanoplatelets. The practical capacity and rate capability of 800 mAh g−1 at 0.05 A g−1 and 174 mAh g−1 at 2.0 A g−1 demonstrate the true potential of GA anodes in advanced lithium‐ion batteries.

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“…Electrochemical measurements revealed that the cathode can deliver a high reversible capacity of 146 mAh g −1 at 50 mA g −1 after 10 0 0 cycles. Moreover, Feng et al prepared the bipolar N-doped graphene frameworks as the cathode for LIBs [115] , and the cathode exhibits an extremely high specific capacity of 379 mAh g −1 at 0.5 A g −1 for 2500 cycles. This performance is superior to most of the reported LIBs cathode materials.…”

Section: Secondary Batteriesmentioning

confidence: 99%

Nitrogen-doped graphene: Synthesis, characterizations and energy applications

Jin

2018

Journal of Energy Chemistry

275

147

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Bipolar nitrogen-doped graphene frameworks as high-performance cathodes for lithium ion batteries

Abstract: As cathode materials in lithium ion batteries, nitrogen-doped graphene frameworks (N-GFs) manifest excellent specific capacity and cycle stability, owing to the fast surface faradaic reactions of pyridinic N and pyridinic N-oxide with both p- and n-doped states.

Cited by 22 publications

References 61 publications

Ultrathin Nitrogen‐Doped Carbon Layer Uniformly Supported on Graphene Frameworks as Ultrahigh‐Capacity Anode for Lithium‐Ion Full Battery

Ultrathin Nitrogen‐Doped Carbon Layer Uniformly Supported on Graphene Frameworks as Ultrahigh‐Capacity Anode for Lithium‐Ion Full Battery

Graphene Acid for Lithium‐Ion Batteries—Carboxylation Boosts Storage Capacity in Graphene

Nitrogen-doped graphene: Synthesis, characterizations and energy applications

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