POWDER TECHNOLOGY
·
2025
·
IF 4.6
Xueqin Liao,Jianzhong Liu,Mengxia Sun,Xiaohui Xue
Fluoride has shown great potential for improving the burning rate and combustion efficiency of aluminum (Al) particles. Herein, the effects of metal fluoride (ferric fluoride, FeF 3 ) and organic fluoride (polytetrafluoroethylene, PTFE) on the combustion of Al particles were comparatively investigated using various characterization methods. The results showed that both FeF 3 and PTFE could improve the thermal reaction properties of Al particles, including thermal oxidation rate, heat release, mass gain, and thermal oxidation efficiency, and the improvement of FeF 3 was better. Thermal reaction curves and tube furnace tests together demonstrated that fluoride and Al particles undergo pre-ignition reaction at low heating rates. Combustion diagnostic results and condensed combustion products (CCPs) analysis of the samples revealed that both fluorides reduced the ignition delay time and increased the combustion intensity, burning rate, combustion efficiency and maximum combustion temperature. When ammonium perchlorate (AP) was not added, PTFE improved the combustion performance of Al particles better due to its high gas production characteristics. PTFE is not as good as FeF 3 after adding AP. Furthermore, varying the FeF 3 content in the binary mixture (Al/FeF 3 ) between 5 % and 20 % did not significantly affect the combustion characteristics of the samples. Interestingly, the high-speed camera captured the jetting phenomenon of Al droplets during combustion, which is attributed to the erosive effect of F on the alumina cap. The jet phenomenon is the direct evidence of the reaction between Al particles and F during combustion, which provides new insights into the complex reaction mechanism between the two. Statistics on a large number of particles indicated that FeF 3 can increase the frequency of the particle jet phenomenon. Finally, the phenomenological mechanism of fluoride promoting Al particle combustion is proposed. Considering the catalytic effect of metals and their corresponding oxides on AP, the addition of metal fluorides to AP-based energetic materials may be a more preferable option.
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2018
·Vol. 1
·期 4
·696-704
·
IF 0
Dong Anwang,Wang Dongxu,Dai Tingting,Chen Qi,Feng Lijuan,Wang Ning
A conjugated micro/mesoporous polymer based on fluorinated iron-porphyrin, FCMP-1, has been prepared via Sonogashira-Hagihara coupling polymerization. The BET-specific surface area of FCMP-1 is about 440 m 2 g −1 , and its pore sizes are mainly distributed in 0.81 nm and the range of 2.9–3.4 nm, which show that FCMP-1 is the micro/mesoporous polyporphyrin. The polymer shows moderate uptake for methane (4.23 wt%, 273 K) and toluene (615 mg g −1 , 298 K). It was also studied as the heterogeneous oxidation catalyst for the oxidative transformation of substituted toluene to corresponding benzoic acid as well as Baeyer–Villiger oxidation using dioxygen as an oxidant. The yields of substituted benzoic acid are ranged from 77 to 88% by employing FCMP-1 as catalyst. Particularly, the yields of the reactions for producing ε -caprolactone (more than 99% selectivity) are ranged from 85 to 98%. The channels derived from the porous structure of Fe-porphyrin network are advantageous for the reactive molecules to contact with the catalytic sites and accelerate the diffusion of reactant and product. When compared with the polymer analogue without fluorinated substituents, FCMP-1 with fluorinated phenyl substituents demonstrates the better catalytic performance and cyclic utilization. The fluorinated phenyl moieties linked to Fe-porphyrins facilitate the transformation, due to their stabilizing effect on porphyrin to restrain the breakdown of the catalyst.
Micro/mesoporous conjugated fluorinated iron-porphyrin polymer FCMP-1 was synthesized. Its uptake performance and catalytic activity for oxidation were also studied.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaolei Ren,Yujia Wang,Qing Ke,Ran Wang,Xingxing Gu
Iron difluoride (FeF 2 ) is one of the promising cathodes to achieve high energy-density lithium-ion batteries (LIBs). However, the sluggish ion transportation kinetics in the FeF 2 bulk phase may cause large voltage hysteresis and lower cell efficiency, which hinders its commercial adoption. Introducing a disordered phase into the ordered bulk FeF 2 is proposed to promote ion transportation and increase ion diffusion channels. Here, varying ratios of the disordered phase are incorporated into the ordered matrix of FeF 2 by adjusting the annealed temperatures. The ion transportation is improved due to the optimal ratio of the disordered to ordered (RDO) phase. Among four electrodes, the RDO25% electrode demonstrates the least electrochemical polarization of 1.22 V and the lowest voltage hysteresis of about 1.0 V, in addition to delivering a discharge capacity of 128 mAh g −1 after 100 cycles in the carbonate-type electrolyte. The introduction of the disordered phase enables FeF 2 to exhibit a distinct intercalation and conversion dual-mechanism cathode. Additionally, appropriate ratios of the disordered-ordered phase can mitigate nanoparticle agglomeration, establish a conformal cathode electrolyte interface (CEI), reduce interfacial resistance, and thereby enhance ion transport.
研究领域:
材料科学
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电化学
·
能源存储
·
纳米材料
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固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Chao Zhang,Mingxia Yan,Wenting Li,Ce Han,Jie Li,He Zhao,Guixiao Jia,Shengli An,Xinping Qiu
Due to the high theoretical specific capacity and low cost, FeF3·0.33H2O has become one of the potential choices of cathode materials for sodium-ion batteries. However, the poor intrinsic conductivity limits its practical applications. Herein, the atomic substitution is used to improve its intrinsic conductivity. The first-principles calculation results show that Cr3+ doping can reduce the band gap of FeF3·0.33H2O to improve its intrinsic conductivity. The discharge specific capacity of Fe0.95Cr0.05F3·0.33H2O with a narrowest band gap is 194.02 mA h/g at 0.1 C within the range of 1.4–4.0 V, which is higher than that of FeF3·0.33H2O (136.47 mA h/g). Using the electrochemical impedance spectroscopy and galvanostatic intermittent titration technique tests, it is found that Rct of Fe0.95Cr0.05F3·0.33H2O is reduced and DNa+ is almost unchanged, as compared to FeF3·0.33H2O.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
计算材料学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Lu Lu,Li Sheng,Li Jun,Lan Lifang,Lu Yan,Xu Shuaijun,Huang Si,Pan Chunyang,Zhao Fenghua
The FeF 3 ·0.33H 2 O cathode material can exhibit a high capacity and high energy density through transfer of multiple electrons in the conversion reaction and has attracted great attention from researchers. However, the low conductivity of FeF 3 ·0.33H 2 O greatly restricts its application. Generally, carbon nanotubes (CNTs) and graphene can be used as conductive networks to improve the conductivities of active materials. In this work, the FeF 3 ·0.33H 2 O cathode material was synthesized via a liquid-phase method, and the FeF 3 ·0.33H 2 O/CNT + graphene nanocomposite was successfully fabricated by introduction of CNTs and graphene conductive networks. The electrochemical results illustrate that FeF 3 ·0.33H 2 O/CNT + graphene nanocomposite delivers a high discharge capacity of 234.2 mAh g −1 in the voltage range of 1.8–4.5 V (vs. Li + /Li) at 0.1 C rate, exhibits a prominent cycling performance (193.1 mAh g −1 after 50 cycles at 0.2 C rate), and rate capability (140.4 mAh g −1 at 5 C rate). Therefore, the electronic conductivity and electrochemical performance of the FeF 3 ·0.33H 2 O cathode material modified with CNTs and graphene composite conductive network can be effectively improved.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Junyu Chen,Xuedong Zhang,Feixiang Wu,Long Xie,Feng Li,Nina Wu,Zixuan Cao,Jinwen Zhao,Yuxuan Zhang,Xin He,Hongxia Gu,Jianyu Huang,Qiao Huang
Integrating conversion-type cathodes (such as iron-based fluorides (IBFs)) into sulfide all-solid-state batteries (ASSBs) significantly enhances energy density but faces challenges including unstable cathode/electrolyte interfaces. To mitigate these issues, a near-amorphous Li1.26Mg0.12Zr1.86(PO4)3 (LMZP) coating technology is developed to protect nano-sized FeF2 (n-FeF2) and micro-sized FeF3 (m-FeF3) cathodes from reacting with the sulfide electrolyte for the first time. The LMZP coating approach offers simplicity, low energy consumption and scalability. With the LMZP-coated cathodes and lithium–indium (Li–In) anode, the ASSBs achieve a discharge capacity of 310 mAh g−1 after 600 cycles and a maximum areal capacity of 2 mAh cm−2 for n-FeF2, and 301 mAh g−1 after 700 cycles with a maximum areal capacity of 3.1 mAh cm−2 for m-FeF3. When using a lithium (Li) metal anode, the ASSBs maintain a discharge capacity of 310 mAh g−1 after 300 cycles for n-FeF2 and 300 mAh g−1 after 600 cycles for m-FeF3, demonstrating excellent cycling stability and capacity retention. Notably, a discharge capacity of 280 mAh g−1 is sustained after 200 cycles for n-FeF2 and 301 mAh g−1 after 180 cycles for m-FeF3, with a reduced stack pressure (10 MPa). These results are unprecedented in IBF-based ASSBs, highlighting the potential of advanced coating strategies to enable scalable, high-performance metal fluoride cathodes in ASSBs with higher energy densities.
研究领域:
储能材料
·
电化学
·
固态电池技术
·
表面涂层工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Long Xie,Xuedong Zhang,Huan Hu,Junyu Chen,Yuxuan Zhang,Ping Xiao,Xin He,Zhenyu Wang,Hongxia Gu,Jianyu Huang,Qiao Huang
Incorporating conversion-type cathodes such as iron trifluoride (FeF3) into sulfide-based all-solid-state lithium batteries (ASSLBs) can significantly enhance the energy density. However, challenges such as interfacial side reactions and volume-change-induced poor physical contact between sulfide electrolytes and FeF3 limit their application. Herein, a yolk–shell (YS) structure with FeF3 as the yolk and fluorine (F)-doped carbon as the shell was successfully designed. Thanks to this electrode design, the ASSLBs achieve a discharge capacity of 318 mAh·g–1 after 400 cycles at 0.2 C, facilitated by the optimized void space in the shell. Moreover, ASSLBs demonstrate excellent cycling life and capacity retention across a broad temperature range from 0 °C (140 mAh·g–1 after 200 cycles at 0.2 C) to 60 °C (410 mAh·g–1 after 200 cycles at 0.2 C). Postanalysis indicates that the shell effectively not only mitigates interfacial side reactions but also accommodates the volume expansion of FeF3 during cycling while maintaining excellent contact between the shell and the sulfide electrolyte. This chemically and physically stable interface ensures the good cycling reversibility of FeF3. This work underscores the critical importance of YS structural design in stabilizing the interface between conversion-type cathodes and solid electrolytes, thereby accelerating the practical application of FeF3 cathodes with increased energy densities in ASSLBs.
研究领域:
材料科学
·
电化学
·
储能
·
全固态电池
·
纳米材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chao Zhang,Shengli An,Wenting Li,Hanying Xu,Weijian Hao,Wei Liu,Zelin Li,Xinping Qiu
Sodium-ion batteries have been considered as one of ideal power sources for energy storage system. However, the choice of cathode material with good cycling stability and high capacity is limited. Herein, a nanocomposite of hierarchical mesoporous iron fluoride and reduced graphene oxide is prepared by an in situ approach. The as-prepared nanocomposite exhibits remarkably high discharge specific capacity of 227.5 mAh/g at 0.1C. Specifically, the discharge specific capacity of the sample still remains 87.5 mAh/g at a high rate of 15C after the 100th cycle. The electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT) measurements show that the addition of reduced graphene oxide can effectively reduce the charge transfer resistance and enhance the Na+ diffusion rate in the FeF3·0.33H2O nanoparticles. The structural changes of FeF3·0.33H2O is further investigated by ex-situ XRD, XPS, and ex situ high-resolution transmission electron microscopy.
研究领域:
材料科学
·
能源存储
·
电池技术
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）