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Reviewing metal fluorides as the cathode materials for high performance Li batteries

Information ＆ Functional Materials 2024年第1期1卷 26-67页

作者： Ao Liu Huadong Yuan Yao Wang Yujing Liu Jianmin Luo Jianwei Nai Xinyong Tao College of Materials Science and Engineering Zhejiang University of TechnologyHangzhouChina

Exploring high‐energy density rechargeable lithium(Li)batteries is urgently needed to meet the demand of the large‐scale electric vehicle ***‐type metal fluorides(MFx)have been considered as desirable cathode materials for next‐generation rechargeable batteries because of their high operational voltages,environmental non‐toxicity,low cost,and high thermal *** this review,we present the most promising and feasible MFx applied in rechargeable Li batteries in terms of capacity,discharge po-tential,volume change,fabricated methods,crystal structure,and cost/*** electrochemical performance is briefly illustrated,and the recent advances in mechanisms focused on MFx cathodes upon cyclic processes are noted and discussed in ***,prospects for the current challenges and possible research directions,with the aim to provide some inspiration for the development of MFx‐based cathodes are presented.

关键词： cathode high‐energy density Li batteries metal fluoride

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Electrochemical oxygen evolution reaction efficiently boosted by selective fluoridation of FeNi3 alloy/oxide hybrid

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Journal of Energy Chemistry 2020年第8期29卷 166-171,I0006页

作者： Meng Zha Chengang Pei Quan Wang Guangzhi Hu Ligang Feng Key Laboratory of Medicinal Chemistry for Natural Resource(Yunnan University) Ministry of EducationSchool of Chemical Science and EngineeringYunnan UniversityKunming 650091YunnanChina School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuChina

Performance boosting of hybrid metal oxide and metal alloy catalyst is crucial to the water electrolysis for hydrogen generation. Herein, a novel concept of selective fluoridation of metal alloy/oxide hybrid is proposed to boost their catalytic performance for the oxygen evolution reaction(OER). A well-recognized OER catalyst system of FeNi3 alloy/oxide embedded in nitrogen-doped porous nanofibers(FeNiO/NCF) is employed as a proof of concept, and it is selectively fluoridated by transforming the metal oxide to metal fluoride(FeNiF/NCF). The crystal structure and surface chemical state transformation are well supported by the spectroscopic analysis and the improved electrochemical performance for OER can be well correlated to the phase and structure change. Specifically, FeNiF/NCF can drive the benchmark current density of 10 mA cm-2 at 260 mV with a Tafel slope of 67 mV dec-1, about 70 mV less than that of FeNiO/*** catalytic kinetics, rapid charge transfer ability, high catalytic efficiency and stability are also probed by electrochemical analysis. The high surface area and roughness are found mainly generated via the high-temperature annealing for the metal alloy/metal oxide formation, and the low-temperature fluoridation process intrinsically contributes to the active structure formation. It is an efficient and universal approach to increase the catalytic performance of metal alloy/oxide for energy-relevant catalytic reactions.

关键词： Oxygen evolution reaction Water splitting FeNi metal oxide metal fluoride

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Thermodynamic and Phase Diagram Modeling of CsF-MF4（M=U, Th） Systems

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Chemical Research in Chinese Universities 2017年第3期33卷 454-459页

作者： LI Xiang WANG Kun XIE Mengya WU Zhu XIE Leidong Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 P. R. China University of Chinese Academy of Sciences Beijing 100049 R R. China Department of Chemical and Materials Engineering University of Alberta Edmonton AB T6G 2V4 Canada College of Sciences Shanghai University Shanghai 200072 P. R. China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 P. R. China

Phase diagrams for the CsF-UF4 and CsF-ThF4 systems were modeled in the present work through computational thennodynamics. The associate solution model with various complex species（CsMFs, Cs2MF6 and Cs3MF7; M=Th, U） was used to thermodynamically describe the binary molten salts. A total of ten intermediate phases were treated as stoichiometric compounds with their Gibbs energies modeled according to the Neumann-Kopp rule. All these model parameters were optimized by the least squares procedure until good coincidence was achieved between the calculated results and most of the experimental data. The derived thermodynamic parameters will be merged into the multicomponent CsF-LiF-BeF2-ThF4-UF4 database for analyzing physicochemical behavior of CsF in the fuel salt of the molten salt breeder reactor.

关键词： Molten salt metal fluoride Thermodynamic and phase diagram modeling

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THE ADSORPTION OF OXYGEN OVER ThO2-BaF2 CATALYST

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Journal of Energy Chemistry 1996年第1期 22-30页

作者： ZHOU Xiao-Ping CHAO Zi-Sheng WAN Hui-Lin TSAI Khi-Rui(Department of Chemistry, Xiamen University Xiamen, Fujian 361005 To whom correspondence should be addressed)

The adsorption of O2 over ThO2-BaF2 catalyst was studied at room temperature. Raman experiments reveal that there is much stronger adsorption of O2 on ThO2-BaF2 than on ThO2 XRD results suggest that ionic exchange exists between BaF2 and ThO2 phases forming the O-species and quasi-free electrons in ThO2-BaF2. The XPS, Raman and EPR results indicate that O22-, O2- and intermediate oxygen species O2n- and O2δ- (1更多还原AbstractFilter('ChDivSummary', 'ChDivSummaryMore', 'ChDivSummaryReset');

关键词： oxygen species metal fluoride ThO2-BaF2

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