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The origins of kinetics hysteresis and irreversibility of monoclinic Li_(3)V_(2)(PO_(4))_(3)

Journal of Energy Chemistry 2022年第4期31卷 593-603页

作者： Hua Huo Zeyu Lin Guiming Zhong Shuaifeng Lou Jiajun Wang Yulin Ma Changsong Dai Yueping Xiong Geping Yin Yong Yang Key Laboratory of Materials for New Energy Conversion and Storage(Ministry of Industry and Information Technology) School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina state Key Laboratory for Physical Chemistry of solid Surface and Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Xiamen Institute of Rare Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361021FujianChina

Monoclinic Li_(2)V_(2)(PO_(4))_(3);is a promising cathode material with complex charge–discharge behavior.Previous structural investigation of this compound mainly focuses on local environments;while the reaction kinetics and the driving force of irreversibility of this material remain unclear.To fully understand the above issues,both the equilibrium and the non-equilibrium reaction routes have been systematically investigated in this study.Multiple characterization techniques including X-ray diffraction,variable temperature(spinning rate)and ex/in situ ^(7)Li,^(31)P solid state NMR have been employed to provide comprehensive insights into kinetics,dynamics,framework structure evolution and charge ordering,which is essential to better design and application of lithium transition metal phosphate cathodes.Our results suggest that the kinetics process between the non-equilibrium and the quasi-equilibrium delithiation pathways from Li_(2)V_(2)(PO_(4))_(3);to V_(2)(PO_(4))_(3);is related with a slow relaxation from two-site to one-site delithiation.More importantly,it has been demonstrated that the irreversibility in this system is not solely affected by cation and/or charge ordering/disordering,but mainly driven by framework structure distortion.

关键词： NMR spectroscopy Electrochemistry solid-state structures Kinetics

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Fine-Tuning of Structural Distortion and Magnetic Anisotropy by Organosulfonates in Octahedral Cobalt(Ⅱ)Complexes

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Chinese Journal of Chemistry 2022年第18期40卷 2193-2202页

作者： Dong Shao Fang-Xue Xu Lei Yin Hong-Qing Li Yu-Chen Sun Zhong-Wen Ouyang Zhen-Xing Wang Yi-Quan Zhang Xin-Yi Wang state Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced MicrostructuresSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu210023 China Hubei Key Laboratory of Processing and Application of Catalytic Materials College of Chemistry and Chemical EngineeringHuanggang Normal UniversityHuanggangHubei438000 China Jiangsu Key Laboratory for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjingJiangsu210097 China Wuhan National High Magnetic Field Centre Huazhong University of Science and TechnologyWuhanHubei430074 China

Precise modulation of the magnetic anisotropy of metal ions remains highly important for the development of high–performance single-molecule magnets(SMMs).We herein reported the synthetic,structural,spectral,magnetic,and computational studies on four mononuclear Co^(Ⅱ) complexes in a distorted octahedral environment.The change of the organosulfonate anions triggers significant modification of the distorted octahedral CoN6 coordination sphere,which enables us to tackle the influence of the structural distortion on the magnetic anisotropy in these complexes.Magnetic measurements revealed that the four complexes possess easy–plane magnetic anisotropy with large and positive zero-field splitting parameters,which decrease with the increasing distortion of the pseudo–octahedral Co^(Ⅱ) coordination geometry.This correlation was further confirmed by high–frequency/–field EPR(HF–EPR)spectra and theoretical calculations.Dynamic magnetic susceptibility measurements indicate that these complexes both exhibit slow magnetic relaxation under an external dc field,indicating the field-induced single-ion magnets(SIMs)of the four complexes.These results indicate that structural distortion plays an important role in the magnetic anisotropy of CoⅡcomplexes and should be carefully considered in the design of molecular complexes with high magnetic anisotropy.

关键词： Cobalt solid-state structures Magnetic properties Single-molecule magnets /Magnetic anisotropy

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New Quinoxaline-Based Blue Emitters: Molecular structures, Aggregation-Induced Enhanced Emission Characteristics and OLED Application

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Chinese Journal of Chemistry 2021年第8期39卷 2154-2162页

作者： Xiaoyu Mao Fuli Xie Xiaohui Wang Qingsong Wang Zhipeng Qiu Mark R.J.Elsegood Jie Bai Xing Feng Carl Redshaw Yanping Huo Jian-Yong Hu Qing Chen Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Material and EnergyGuangdong University of TechnologyGuangzhouGuangdong 510006China Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and EngineeringShaanxi Normal UniversityXi'anShaanxi 710119China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhouGuangdong 510006China Chemistry Department Loughborough UniversityLoughboroughLE113TUUK Department of Chemistry University of HullCottingham RoadHullYorkshire HU67RXUK Chinese Research Academy of Environmental Sciences No.8DayangfangBeiyuanBeijingChina

Three new deep blue light emitters,bearing quinoxaline with different substituents(biphenyl/pyrene)at the 1-or 2-position,were synthesized by a Pd-catalysed coupling reaction in high yields,and were fully characterize... 详细信息

关键词： Quinoxaline Pyrene Aggregation-induced emission solid-state structures Substituent effects

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