Precisely synthesized LiF-tipped CoF<sub>2</sub>-nanorod heterostructures improve energy storage capacities

Wang, Siyuan; Fu, Hao; Ma, Jiamin; Shi, Xiaomeng; Wang, Huimin; Yin, Zongyou; Zhang, Shuai; Jin, Mengdie; Zhong, Ziyun; Zhai, Xinyun; Du, Yaping

doi:10.1039/d2sc04008e

“…For example, CoF 2 , which has excellent theoretical capacity (553 mAh g −1 ) and energy density (2038 mAh cm −3 ), has also been widely studied and reported as an cathode material for LIBs [125,126]. Similar to FeF 2 , the source of the electrochemical capacity contribution of CoF 2 is mainly purely a conversion reaction mechanism, and the commonly reported equations for CoF 2 conversion reactions are as follows [127]:…”

Section: Othersmentioning

confidence: 99%

Recent advances of metal fluoride compounds cathode materials for lithium ion batteries: a review

Gao,

Li,

Hua

et al. 2024

Mater. Futures

2

0

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As the most successful new energy storage device developed in recent decades, lithium-ion batteries (LIBs) are ubiquitous in the modern society. However, current commercial LIBs comprising mainly intercalated cathode materials are limited by the theoretical energy density which cannot meet the high storing energy demanded by renewable applications. Compared to intercalation-type cathode materials, low-cost conversion-type cathode materials with a high theoretical specific capacity are expected to boost the overall energy of LIBs. Among the different conversion cathode materials, metal fluorides have become a popular research subject for their environmental friendliness, low toxicity, wide voltage range, and high theoretical specific capacity. In this review, we compare the energy storage performance of intercalation and conversion cathode materials based on thermodynamic calculation and summarize the main challenges. The common conversion-type cathode materials are described and their respective reaction mechanisms are discussed. In particular, the structural flaws and corresponding solutions and strategies are described. Finally, we discussed the prospective of metal fluorides and other conversion cathode materials to guide further research in this important field.

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Adjustable Plane Curvature of Covalent Organic Framework Enabling Outstanding Dielectric, Electret, and High‐Temperature Processing Properties

Chen,

Li,

Mei

et al. 2023

Angewandte Chemie

0

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With the rapid development of integrated circuits towards miniaturization and complexity, there is an urgent need for materials with low dielectric constant/loss and high processing temperatures to effectively prevent signal delay and crosstalk. With high porosity, thermal stability, and easy structural modulation, covalent organic frameworks have great potential in the field of low dielectric materials. However, the optimization of dielectric properties by modulating the conjugated/plane curvature structure of covalent organic frameworks (COFs) has rarely been reported. Accordingly, we herein innovatively prepare COF films with adjustable planar curvature, hence possessing ultralow dielectric constant (1.9 at 1 kHz), ultralow dielectric loss at 1 kHz (0.0029 at room temperature, 0.0052 at 200 °C), high thermal decomposition temperature (5% weight loss temperature, 473 °C) and good hydrophobicity (water contact angle, 105.3°). Also, to the best of our knowledge, we are the first to report that the resulting COF film enables high surface potential (~320 V) for one week, attributing to its intrinsic high porosity, thus presenting great potential in electret applications. Accordingly, this innovative work provides a readily available and scalable idea to prepare materials with comprehensively excellent dielectric and electret properties as well as high processing temperatures simultaneously for advanced electronic device applications.

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Adjustable Plane Curvature of Covalent Organic Framework Enabling Outstanding Dielectric, Electret, and High‐Temperature Processing Properties

Chen,

Li,

Mei

et al. 2023

Angew Chem Int Ed

1

0

View full text Add to dashboard Cite

With the rapid development of integrated circuits towards miniaturization and complexity, there is an urgent need for materials with low dielectric constant/loss and high processing temperatures to effectively prevent signal delay and crosstalk. With high porosity, thermal stability, and easy structural modulation, covalent organic frameworks have great potential in the field of low dielectric materials. However, the optimization of dielectric properties by modulating the conjugated/plane curvature structure of covalent organic frameworks (COFs) has rarely been reported. Accordingly, we herein innovatively prepare COF films with adjustable planar curvature, hence possessing ultralow dielectric constant (1.9 at 1 kHz), ultralow dielectric loss at 1 kHz (0.0029 at room temperature, 0.0052 at 200 °C), high thermal decomposition temperature (5% weight loss temperature, 473 °C) and good hydrophobicity (water contact angle, 105.3°). Also, to the best of our knowledge, we are the first to report that the resulting COF film enables high surface potential (~320 V) for one week, attributing to its intrinsic high porosity, thus presenting great potential in electret applications. Accordingly, this innovative work provides a readily available and scalable idea to prepare materials with comprehensively excellent dielectric and electret properties as well as high processing temperatures simultaneously for advanced electronic device applications.

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Precisely synthesized LiF-tipped CoF₂-nanorod heterostructures improve energy storage capacities

Abstract: CoF2, with a relatively high theoretical capacity (553 mAh g-1), has been attracting the increasing attentions in the energy storage field. However, the facile and controllable synthesis of monodispersed CoF2...

Cited by 6 publications

References 43 publications

Recent advances of metal fluoride compounds cathode materials for lithium ion batteries: a review

Recent advances of metal fluoride compounds cathode materials for lithium ion batteries: a review

Adjustable Plane Curvature of Covalent Organic Framework Enabling Outstanding Dielectric, Electret, and High‐Temperature Processing Properties

Adjustable Plane Curvature of Covalent Organic Framework Enabling Outstanding Dielectric, Electret, and High‐Temperature Processing Properties

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Precisely synthesized LiF-tipped CoF2-nanorod heterostructures improve energy storage capacities

Abstract: CoF2, with a relatively high theoretical capacity (553 mAh g-1), has been attracting the increasing attentions in the energy storage field. However, the facile and controllable synthesis of monodispersed CoF2...

Cited by 6 publications

References 43 publications

Recent advances of metal fluoride compounds cathode materials for lithium ion batteries: a review

Recent advances of metal fluoride compounds cathode materials for lithium ion batteries: a review

Adjustable Plane Curvature of Covalent Organic Framework Enabling Outstanding Dielectric, Electret, and High‐Temperature Processing Properties

Adjustable Plane Curvature of Covalent Organic Framework Enabling Outstanding Dielectric, Electret, and High‐Temperature Processing Properties

Contact Info

Product

Resources

About

Precisely synthesized LiF-tipped CoF₂-nanorod heterostructures improve energy storage capacities