Designing π-conjugated polypyrene nanoflowers formed with meso- and microporous nanosheets for high-performance anode of potassium ion batteries

Li, Hao; Wu, Jiang; Li, Hong-Bao; Xu, Yuling; Zheng, Jun; Shi, Qiufan; Kang, Hongwei; Zhao, Shen; Zhang, Longhai; Wang, Rui; Xin, Sen; Zhou, Tengfei; Zhang, Chaofeng

doi:10.1016/j.cej.2021.132704

Cited by 24 publications

(18 citation statements)

References 69 publications

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“…The ever-growing demand for wearable electronic devices has motivated the research for flexible energy storage systems with safety, [1,2] low cost, [3,4] good wearability, [5,6] and high energy density. [7,8] Additionally, aqueous rechargeable zinc ion batteries (AZIBs) have been regarded as safe energy storage systems due to their nonflammable property and excellent ion conductivity. [9] Therefore, a suitable electrolyte is becoming crucial for flexible and wearable electronic devices that require devices to be stable when subjected to external shocks or even deformation.…”

Section: Introductionmentioning

confidence: 99%

Application of cellulose‐based hydrogel electrolytes in flexible batteries

Liu

Wang

et al. 2022

Carbon Neutralization

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Flexible energy storage devices have the advantages of portability and safety, and have great potential for developing electronic materials in the future. In flexible batteries, the electrolyte presents an essential role in the electrochemical performance and safety of the batteries. Hydrogel electrolyte materials are considered to be one of the ideal electrolyte materials due to their environmental friendliness, high safety, maneuverability, and innocuity. However, ordinary hydrogels often suffer some defects, such as insufficient ductility and poor water retention. Currently, many researchers report cellulose materials as reinforcing agents to improve the performance of hydrogels. In this paper, we review the recent application of cellulose in hydrogel‐based materials for energy storage technology and summarize the functions and properties of cellulose. In addition, we analyze the shortcomings of cellulose used in hydrogels and briefly describe the prospects of cellulose materials, hoping to contribute to the research in this field.

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Section: Introductionmentioning

confidence: 99%

Application of cellulose‐based hydrogel electrolytes in flexible batteries

Liu

Wang

et al. 2022

Carbon Neutralization

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“…(b) Rate performance. (c) Comparison of rate performance of TQBQ-COF and recently researched organic counterpart anodes in KIBs. ,,− (d–f) Long-term cycling capacity at different current densities. (d) 0.1 C for 50 cycles; (e) 0.5 C for 100 cycles after 5 cycles at 0.2 C and (f) 3 C for 2000 cycles after 5 cycles at 0.1 C. (g) Comparison of reversible capacity of the TQBQ-COF anode and representative organic counterparts. ,,− …”

Section: Resultsmentioning

confidence: 99%

Multiple Accessible Redox-Active Sites in a Robust Covalent Organic Framework for High-Performance Potassium Storage

et al. 2023

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Covalent organic framework (COF) materials with porous character and robust structure have significant applied implications for Kion battery (KIB) anodes, but they are limited by the low reversible capacity and inferior rate capability. Here, based on theoretical calculations, we identified that a porous bulk COF featuring numerous pyrazines and carbonyls in the π-conjugated periodic skeleton could provide multiple accessible redox-active sites for high-performance potassium storage. Its porous structure with a surface-dominated storage mechanism enabled the fast and stable storage of K-ions. Its insolubility in organic electrolytes and small volumetric change after potassiation ensured a robust electrode for stable cycling. As a KIB anode, this bulk COF demonstrated an unprecedentedly outstanding combination of reversible capacity (423 mAh g −1 at 0.1 C), rate capability (185 mAh g −1 at 10 C), and cyclability. The theoretical simulation and comprehensive characterizations confirmed the active sites are contributed by C�O, C�N, and the cation−π effect.

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Section: Battery-type Anode Materialsmentioning

confidence: 99%

“…The formation of π-conjugation in an active material decreases the solubility in conventional electrolytes and simultaneously improves the electrical conductivity. Recently, Zhang’s group designed π-conjugated polypyrene porous nanoflowers as an anode for KIBs . Fourier-transform infrared spectroscopy results in the first cycle revealed that the K + storage in polypyrene is a reversible and stable potassiation/depotassiation process (Figure i,j).…”

Section: Battery-type Anode Materialsmentioning

confidence: 99%

“…Recently, Zhang's group designed π-conjugated polypyrene porous nanoflowers as an anode for KIBs. 178 Fourier-transform infrared spectroscopy results in the first cycle revealed that the K + storage in polypyrene is a reversible and stable potassiation/depot-assiation process (Figure 17i,j). The polypyrene structure also exhibited a high K + ion diffusion coefficient and large free space to accommodate volume expansion, thus showing good rate performance and high structural stability.…”

Section: Battery-type Anode Materialsmentioning

confidence: 99%

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Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

et al. 2021

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Potassium ion energy storage devices are competitive candidates for grid-scale energy storage applications owing to the abundancy and cost-effectiveness of potassium (K) resources, the low standard redox potential of K/K+, and the high ionic conductivity in K-salt-containing electrolytes. However, the sluggish reaction dynamics and poor structural instability of battery-type anodes caused by the insertion/extraction of large K+ ions inhibit the full potential of K ion energy storage systems. Extensive efforts have been devoted to the exploration of promising anode materials. This Review begins with a brief introduction of the operation principles and performance indicators of typical K ion energy storage systems and significant advances in different types of battery-type anode materials, including intercalation-, mixed surface-capacitive-/intercalation-, conversion-, alloy-, mixed conversion-/alloy-, and organic-type materials. Subsequently, host–guest relationships are discussed in correlation with the electrochemical properties, underlying mechanisms, and critical issues faced by each type of anode material concerning their implementation in K ion energy storage systems. Several promising optimization strategies to improve the K+ storage performance are highlighted. Finally, perspectives on future trends are provided, which are aimed at accelerating the development of K ion energy storage systems.

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Designing π-conjugated polypyrene nanoflowers formed with meso- and microporous nanosheets for high-performance anode of potassium ion batteries

Cited by 24 publications

References 69 publications

Application of cellulose‐based hydrogel electrolytes in flexible batteries

Application of cellulose‐based hydrogel electrolytes in flexible batteries

Multiple Accessible Redox-Active Sites in a Robust Covalent Organic Framework for High-Performance Potassium Storage

Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

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