Comprehensive Understanding of Sodium‐Ion Capacitors: Definition, Mechanisms, Configurations, Materials, Key Technologies, and Future Developments

Cai, Peng; Zou, Kangyu; Deng, Xinglan; Wang, Baowei; Min, Zheng; Li, Longhao; Hou, Hongshuai; Zou, Guoqiang; Ji, Xiaobo

doi:10.1002/aenm.202003804

Cited by 125 publications

(74 citation statements)

References 224 publications

(211 reference statements)

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“…In general, the pores on the surface of ACs can be divided into three categories according to their diameter: I) micropores (<2 nm), II) mesopores (2–50 nm) and III) macropores (>50 nm) [5,51,132,133] . Particularly, micropores when present in significant amounts can offer a high surface area to volume ratio, contributing to the adsorption/desorption processes [134–136] .…”

Section: Materials For Sicsmentioning

confidence: 99%

Sodium‐Ion Capacitors: Recent Development in Electrode Materials

Zhang

et al. 2021

Batteries & Supercaps

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Sodium‐ion hybrid capacitors (SICs), combining the advantages of both sodium‐ion batteries (SIBs) and electrochemical supercapacitors, have captured sustained attention in the field of energy storage devices due to their high energy and power density, long lifespan, and excellent operation stability. However, conventional SICs based on battery‐type anodes and capacitive‐type cathodes suffer from imbalance on capacity and kinetics. In this regard, rational structure design on electrode materials is still necessary for SICs. Over the past two decades, tremendous efforts have been devoted to the exploration of suitable electrode materials to fabricate high‐performance SICs. Herein, after a brief introduction on the charge storage mechanisms of SICs, the recent developments on electrode materials for SICs are summarized, especially focusing on material design strategies as well as the relationship between structure and corresponding electrochemical performances. Furthermore, the challenges and opportunities for the further development of SICs are also proposed.

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Section: Materials For Sicsmentioning

confidence: 99%

Sodium‐Ion Capacitors: Recent Development in Electrode Materials

Zhang

et al. 2021

Batteries & Supercaps

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“…Metal ion capacitors (MICs), as the combination of metal ion batteries (large energy density) and supercapacitors (high power density), were built for next-generation energy storage systems [ 1 – 5 ]. Nevertheless, the deficiency of non-metal content nature in activated carbon associated with physically capacitive behavior (as cathode), seriously restricts the development of MICs due to the side reaction of metal ion consumption caused by the formation of solid electrolyte interphase (SEI) in the anode part [ 6 – 10 ].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Low-Dose Pre-Metallation Strategy Served for Commercial Metal-Ion Capacitors

et al. 2022

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Highlights Interfacial bonding strategy has been successfully applied to address the high overpotential issue of sacrificial additives, which reduced the decompositon potential of Na2C2O4 from 4.50 to 3.95 V. Ultra-low-dose technique assisted commercial sodium ion capacitor (AC//HC) could deliver a remarkable energy density of 118.2 Wh kg−1 as well as excellent cycle stability. In-depth decomposition mechanism of sacrificial compound and the relative influence after pre-metallation were revealed by advanced in situ and ex situ characterization approaches. Abstract Sacrificial pre-metallation strategy could compensate for the irreversible consumption of metal ions and reduce the potential of anode, thereby elevating the cycle performance as well as open-circuit voltage for full metal ion capacitors (MICs). However, suffered from massive-dosage abuse, exorbitant decomposition potential, and side effects of decomposition residue, the wide application of sacrificial approach was restricted. Herein, assisted with density functional theory calculations, strongly coupled interface (M–O–C, M = Li/Na/K) and electron donating group have been put forward to regulate the band gap and highest occupied molecular orbital level of metal oxalate (M2C2O4), reducing polarization phenomenon and Gibbs free energy required for decomposition, which eventually decrease the practical decomposition potential from 4.50 to 3.95 V. Remarkably, full sodium ion capacitors constituted of commercial materials (activated carbon//hard carbon) could deliver a prominent energy density of 118.2 Wh kg−1 as well as excellent cycle stability under an ultra-low dosage pre-sodiation reagent of 15–30 wt% (far less than currently 100 wt%). Noteworthily, decomposition mechanism of sacrificial compound and the relative influence on the system of MICs after pre-metallation were initially revealed by in situ differential electrochemical mass spectrometry, offering in-depth insights for comprehending the function of cathode additives. In addition, this breakthrough has been successfully utilized in high performance lithium/potassium ion capacitors with Li2C2O4/K2C2O4 as pre-metallation reagent, which will convincingly promote the commercialization of MICs.

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“…In response to the global climate crisis, the research of new energy storage devices has been widely focused on expanding the application of renewable energy to replace fossil energy ( Tan et al, 2020a ; Wang et al, 2020a ; Gan et al, 2020 ; Cai et al, 2021a ; Liu et al, 2021a ; Cai et al, 2021b ; Deng et al, 2021 ; Zhao et al, 2021 ). In the field of new energy storage, lithium-ion batteries have been widely used because of their high energy density and wide working voltage ( Park et al, 2021 ; Xia et al, 2021 ; Feng et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Stability Optimization Strategies of Cathode Materials for Aqueous Zinc Ion Batteries: A Mini Review

Gan

Zheng

et al. 2022

Front. Chem.

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Among the new energy storage devices, aqueous zinc ion batteries (AZIBs) have become the current research hot spot with significant advantages of low cost, high safety, and environmental protection. However, the cycle stability of cathode materials is unsatisfactory, which leads to great obstacles in the practical application of AZIBs. In recent years, a large number of studies have been carried out systematically and deeply around the optimization strategy of cathode material stability of AZIBs. In this review, the factors of cyclic stability attenuation of cathode materials and the strategies of optimizing the stability of cathode materials for AZIBs by vacancy, doping, object modification, and combination engineering were summarized. In addition, the mechanism and applicable material system of relevant optimization strategies were put forward, and finally, the future research direction was proposed in this article.

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Comprehensive Understanding of Sodium‐Ion Capacitors: Definition, Mechanisms, Configurations, Materials, Key Technologies, and Future Developments

Cited by 125 publications

References 224 publications

Sodium‐Ion Capacitors: Recent Development in Electrode Materials

Sodium‐Ion Capacitors: Recent Development in Electrode Materials

Ultra-Low-Dose Pre-Metallation Strategy Served for Commercial Metal-Ion Capacitors

Stability Optimization Strategies of Cathode Materials for Aqueous Zinc Ion Batteries: A Mini Review

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