Graphene boosted pseudocapacitive lithium storage: A case of G-Fe2O3

Wang, Chengzhi; Zhao, Yongjie; Zhai, Ximei; Ding, Caihua; Zhao, Xiuchen; Li, J.; Jin, Haibo

doi:10.1016/j.electacta.2018.07.022

Cited by 30 publications

(16 citation statements)

References 32 publications

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“…To better understand their effect, electrochemical impedance spectroscopy (EIS) analysis was performed to monitor the bulk structure evolution of electrodes and the CEI formation. The continuously increasing resistance (Figure S11) implies an unstable and undesirable CEI, which would inevitably deteriorate the electrochemical performance. − To confirm the presence of the CEI on the electrode surface, HRTEM images were taken on the Na 4 MnCr(PO 4 ) 3 electrode after 50 cycles in 2.5–4.6 V (Figure S12), wherein a discontinuous layer with an amorphous outer layer and crystalline interior is clearly observed. The TEM-EDS mapping result indicates a high content of Na, F, and C elements on the surface of the electrode.…”

Section: Results and Discussionmentioning

confidence: 99%

Elevating Energy Density for Sodium-Ion Batteries through Multielectron Reactions

Zhao

Gao

et al. 2021

Nano Lett.

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It remains a great challenge to explore desirable cathodes for sodium-ion batteries to satisfy the ever-increasing demand for large-scale energy storage systems. In this Letter, we report a NASICON-structured Na4MnCr(PO4)3 cathode with high specific capacity and operation potential. The reversible access of the Mn2+/Mn3+ (3.75/3.4 V), Mn3+/Mn4+ (4.25/4.1 V), and Cr3+/Cr4+ (4.4/4.3 V vs Na/Na+) redox couples in a Na4MnCr(PO4)3 cathode endows a distinct three-electron redox reaction during the insertion/extraction process. The highly stable NASICON structure with a small volume variation upon cycling ensures long-time cycling stability (73.3% capacity retention after 500 cycles within the potential region of 2.5–4.6 V). The impedance analysis and interface characterization indicate that the evolution of a cathode electrolyte interphase at high potential is correlated with the capacity fading, while the robustness of the NASICON framework is redemonstrated.

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Section: Results and Discussionmentioning

confidence: 99%

Elevating Energy Density for Sodium-Ion Batteries through Multielectron Reactions

Zhao

Gao

et al. 2021

Nano Lett.

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“…The kinetic behavior of sodium storage in Na 3 V 1.5 Cr 0.5 (PO 4 ) 3 was studied via CV analysis with different scan rates (Figure e). Metal‐ion electrochemical storage can be divided into two processes, a diffusion reaction and a pseudocapacitance process . The diffusion reaction process usually plays the dominant role in sodium‐ion storage; the pseudocapacitance behavior is beneficial for rate capability and extended cycling life.…”

Section: Resultsmentioning

confidence: 99%

Three Electron Reversible Redox Reaction in Sodium Vanadium Chromium Phosphate as a High‐Energy‐Density Cathode for Sodium‐Ion Batteries

Zhao

Gao²,

Gao³

et al. 2020

Adv Funct Materials

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100

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A sodium‐ion battery operating at room temperature is of great interest for large‐scale stationary energy storage because of its intrinsic cost advantage. However, the development of a high capacity cathode with high energy density remains a great challenge. In this work, sodium super ionic conductor‐structured Na3V2−xCrx(PO4)3 is achieved through the sol–gel method; Na3V1.5Cr0.5(PO4)3 is demonstrated to have a capacity of 150 mAh g−1 with reversible three‐electron redox reactions after insertion of a Na+, consistent with the redox couples of V2+/3+, V3+/4+, and V4+/5+. Moreover, a symmetric sodium‐ion full cell utilizing Na3V1.5Cr0.5(PO4)3 as both the cathode and anode exhibits an excellent rate capability and cyclability with a capacity of 70 mAh g−1 at 1 A g−1. Ex situ X‐ray diffraction analysis and in situ impedance measurements are performed to reveal the sodium storage mechanism and the structural evolution during cycling.

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“…For instance, the introduction of carbon coating layers onto Fe 2 O 3 core has been widely explored due to the capacity of the carbon layer to enhance electrical conductivity effectively and restrain the cracking and crumbling of the Fe 2 O 3 anode upon cycling. Zhao et al [20] prepared Fe 2 O 3 nanoparticles and graphene oxides through hydrothermal and Hummers’ [21] method respectively. Then, graphene-Fe 2 O 3 composites were obtained by freeze drying process.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Properties of Pomegranate-Shaped Fe2O3/C Anodes for Li-ion Batteries

et al. 2018

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Due to the severe volume expansion and poor cycle stability, transition metal oxide anode is still not meeting the commercial utilization. We herein demonstrate the synthetic method of core-shell pomegranate-shaped Fe2O3/C nano-composite via one-step hydrothermal process for the first time. The electrochemical performances were measured as anode material for Li-ion batteries. It exhibits excellent cycling performance, which sustains 705 mAh g−1 reversible capacities after 100 cycles at 100 mA g−1. The anodes also showed good rate stability with discharge capacities of 480 mAh g−1 when cycling at a rate of 2000 mA g−1. The excellent Li storage properties can be attributed to the unique core-shell pomegranate structure, which can not only ensure good electrical conductivity for active Fe2O3, but also accommodate huge volume change during cycles as well as facilitate the fast diffusion of Li ion.

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Graphene boosted pseudocapacitive lithium storage: A case of G-Fe2O3

Cited by 30 publications

References 32 publications

Elevating Energy Density for Sodium-Ion Batteries through Multielectron Reactions

Elevating Energy Density for Sodium-Ion Batteries through Multielectron Reactions

Three Electron Reversible Redox Reaction in Sodium Vanadium Chromium Phosphate as a High‐Energy‐Density Cathode for Sodium‐Ion Batteries

Preparation and Electrochemical Properties of Pomegranate-Shaped Fe2O3/C Anodes for Li-ion Batteries

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