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Unveiling the tailorable electrochemical properties of zeolitic imidazolate framework-derived Ni-doped LiCoO_(2) for lithium-ion batteries in half/full cells

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Journal of Energy Chemistry 2024年第6期93卷 229-242,I0006页

作者： Jian-En Zhou Yiqing Liu Zhijian Peng Quanyi Ye Hua Zhong Xiaoming Lin Ronghua Zeng Yongbo Wu Jiaye Ye Guangdong Provincial International Joint Research Center for Energy Storage Materials Key Laboratory of Theoretical Chemistry of EnvironmentMinistry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006GuangdongChina School of Chemistry and Physics Faculty of ScienceQueensland University of TechnologyBrisbaneQLD 4001Australia Key Laboratory of Atomic and Subatomic Structure and Quantum Control(Ministry of Education) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of MatterSchool of PhysicsSouth China Normal UniversityGuangzhou 510006GuangdongChina Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum MatterSouth China Normal UniversityGuangzhou 510006GuangdongChina

As a prevailing cathode material of lithium-ion batteries(LIBs),LiCoO_(2)(LCO)still encounters the tricky problems of structural collapse,whose morphological engineering and cation doping are crucial for surmounting the mechanical strains and alleviating phase degradation upon cycling.Hereinafter,we propose a strategy using a zeolitic imidazolate framework(ZIF)as the self-sacrificing template to directionally prepare a series of LiNi_(0.1)Co_(0.9)O_(2)(LNCO)with tailorable electrochemical properties.The rational selection of sintering temperature imparts the superiority of the resultant products in lithium storage,during which the sample prepared at 700℃(LNCO-700)outperforms its counterparts in cyclability(156.8 mA h g^(-1)at 1 C for 200 cycles in half cells,1 C=275 mA g^(-1))and rate capability due to the expedited ion/electron transport and the strengthen mechanical robustness.The feasibility of proper Ni doping is also divulged by half/full cell tests and theoretical study,during which LNCO-700(167 mA h g^(-1)at 1 C for 100 cycles in full cells)surpasses LCO-700 in battery performance due to the mitigated phase deterioration,stabilized layered structu re,ameliorated electro nic co nductivity,a nd exalted lithium sto rage activity.This work systematically unveils tailorable electrochemical behaviors of LNCO to better direct their practical application.

关键词： Lithium-ion batteries Zeolitic imidazolate framework LiNi_(0.1)Co_(0.9)O_(2) electrochemical properties

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Influence of manganese rate on structural, optical and electrochemical properties of CeO_(2) thin films deposited by spray pyrolysis:Supercapacitor applications

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Journal of Rare Earths 2022年第10期40卷 1611-1618页

作者： J.Zimou K.Nouneh A.Talbi L.El Gana A.El-Habib R.Hsissou M.Addou Laboratory of Materials Physics and Subatomic Department of PhysicsFaculty of ScienceIbn Tofail UniversityBP 13314000KenitraMoroco Thin Film and Nanomaterial Research Team Faculty of Science and TechiquesAbdelmalek Essadi UniversityTangerMorocco Laboratory of Organic Chemistry Catalysis and EnvironmentFaculty of SciencesIbn Tofail UniversityBP 24214000KenitraMorocco

The present work aimed to investigate the electrochemical properties of ITO substrates in propylene carbonate(PC) with 0.5 mol/L lithium perchlorate(LiClO_(4)) medium in the presence of elaborated thin films of cerium dioxide pure and doped with manganese at varying percentages.Ce_(1-x)Mn_(x)O_(2)(x=0 wt%,2 wt%,4 wt% and 6 wt%) were successfully deposited by the spray pyrolysis(SP) technique on the glass substrate and ITO at 450℃.The effects of manganese(Mn) doped thin films Ce_(1-x)Mn_(x)O_(2) were studied and investigated by using different analyses namely X-ray diffraction(XRD) analysis,Raman spectroscopy method,UV-Vis spectrophotometer technique,atomic force microscopy(AFM) analysis and electrochemical properties.XRD data obtained present a polycrystalline with a face-centred cubic structure of fluorite type.Raman results of undoped and Mn doped thin films show two peaks at 465 and 600 cm^(-1),due to the formation of extrinsic oxygen vacancies by the incorporation of Mn into Ce1-xMnxO_(2) matrix.Energy dispersive spectroscopy(EDS) data show the presence of Ce,O,and Mn elements in the elaborated films.The AFM results reveal that the surface roughness decreases with increasing Mn rate.Further,band gap energy of thin films decreases with increasing in Mn rate due to the formation of defect state between valence and conduction band.The storage capacity of the elaborated Ce_(1-x)Mn_(x)O_(2)/ITO/PC+LiClO_(4) electrode reaches a maximum of 1.997 mF in the presence of 6 wt% of Mn.

关键词： Ce1-xMnxO_(2)thin films electrochemical properties ITO substrates XRD/UV-Vis/AFM Band gap energy Storage capacity

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Interconnected Ni(OH)_(2)and polyether amine on carbon fiber surface for simultaneously improving interfacial adhesion of epoxy composites and electrochemical properties

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Chinese Journal of Aeronautics 2022年第5期35卷 419-428页

作者： Qing WU Qinqin WAN Qianli LIU Fen WANG Xin LIU Jianfeng ZHU School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science&TechnologyXi’an 710021China Shanghai Composites Science&Technology Co. Ltd.Shanghai 201112China

Interconnected Ni(OH)_(2)nanoflakes and polyether amine(PEA)were deposited on carbon fiber tows via a facial and effective process of chemical bath deposition and dip coating.Based on this,a win–win benefit of simultaneously improvements in interfacial shear strength(IFSS)of carbon fiber/epoxy composites and the electrochemical activity has been achieved.Compared with CF and CF-Ni(OH)_(2)composites,the IFSS of CF-Ni(OH)_(2)-PEA/epoxy composite respectively increased 7.9%and 45.4%,which was put down to the covalent bonding of Ni(OH)_(2)-PEA coating with fiber and epoxy matrix,as well as the effective stress transfer by the uniform honeycomb structure of Ni(OH)_(2).In aqueous KOH electrolyte,the CF-Ni(OH)_(2)-PEA electrode presented the maximum specific capacitance of 689.98 F·g^(-1)at 5 m V·s^(-1),572.28 F·g^(-1)at a current density of 0.5 A·g^(-1)due to the strong adhesion of carbon fiber with Ni(OH)_(2)by PEA,the reservation of the threedimensional hollow honeycomb structure of Ni(OH)_(2)for easy ion-transport and–NH_(2)functional groups from PEA for providing more active sites.The excellent performance of CF-Ni(OH)_(2)-PEA reinforcement demonstrates its promising potential for application in high performance composites with integrated structure and function,which shows great advantages in various fields of aerospace,energy,electronics,automobile,civil engineering,sports,etc.

关键词： Carbon fiber electrochemical properties Interface/interphase Polymer-matrix composites Surface modification

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Intelligently assembly of W_(18)O_(49)nanorod clusters with directionally generated oxygen vacancies and excellent electrochemical properties

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Nano Research 2022年第4期15卷 3575-3586页

作者： Dan Zhou Xiaojiao Guo Yixiang Chen Xiaoyu Yuan Jinku Liu Key Laboratory for Advanced Materials School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Mixed-valence metallic compounds are a class of functional materials with peculiar electrochemical properties.Exploring the correlation between defects and corrosion resistance of mixed-valence metallic compounds is a novel and interesting subject.Through an intelligently designed synergistic process of reduction and directed assembly,not only the directional generation of oxygen vacancies along the normal direction of the(010)crystal plane was achieved,but also the W_(18)O_(49)mixed-valence metal oxide(MVMO)with a single crystalline phase and an assembled ordered three-dimensional cluster structure of nanorods was obtained.Three attractive effects of oriented oxygen vacancies in W_(18)O_(49)MVMO were discovered.First,the oxygen vacancy channels realized the directional concentrated transport of oxygen atoms to form dense oxide passivation film.Second,the directional concentrated oxygen vacancies as active centers effectively solved the problem of difficult photoelectron leap and separation of pure-phase semiconductors,realizing photogenerated cathodic protection.Third,the high-energy vacancies endowed the material with antibacterial function,which contributed to the stable existence of the anti-corrosion system.The resistance value of W_(18)O_(49)MVMO as an anti-corrosion functional material was increased to more than 4.00 times that of the original metal protection layer.The experimental results obtained in this research were of great reference value for revealing the intrinsic mechanism of correlation between oxygen defect orientation of MVMOs and electrochemistry.

关键词： oxygen vacancy directional generated W_(18)O_(49) mixed-valence metal oxide electrochemical properties

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Chevrel phase: A review of its crystal structure and electrochemical properties

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Progress in Natural Science:Materials International 2023年第1期33卷 8-15页

作者： Meng Liu Guocheng Lv Tianming Liu Hao Liu Lingchang Kong Lintao Tian Wenxiu Rao Yuxin Li Libing Liao Juchen Guo Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences(Beijing) School of Science China University of Geosciences Materials Science and Engineering Program University of California-Riverside Department of Chemical and Environmental Engineering University of California – Riverside

Chevrel phase compounds have attracted increasing attention as electrochemical energy storage materials and electro-catalysts. Benefiting from their unique crystal structure, Chevrel phase compounds can not only function as the host structures for reversible intercalation of a broad range of cations, but also exhibit high catalytic activity in electrochemical reduction reactions. Here we provide an overview of recent progress in the development of Chevrel phase materials including new understanding of structural features, synthetic methods, and electrochemical properties. A brief conclusion and perspectives on the future development of Chevrel phase materials are also provided.

关键词： Chevrel phase electrochemical properties Energy storage Electro-catalysis

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Effect of carbon coating on electrochemical properties of AB_(3.5)-type La-Y-Ni-based hydrogen storage alloys

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Journal of Rare Earths 2022年第8期40卷 1264-1271页

作者： Ran Wu Huiping Yuan Yuru Liu Zhenyu Hou Zhinian Li Shumao Wang Lijun Jiang Lei Hao National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China Institute for Advanced Materials and Technology University of Science&Technology BeijingBeijing 100083China

The superlattice La-Y-Ni-based hydrogen storage alloys have high discharge capacity and are easy to prepare.However,there is still a gap in commercial applications because of the severe corrosion of the alloys in electrolyte and poor high-rate dischargeability(HRD).Therefore,(LaSmY)(NiMnAl)_(3.5) alloy was prepared by magnetic levitation induction melting,and then the alloy was coated with different contents(0.1 wt%-1.0 wt%) of nano-carbons by low-temperature sintering with sucrose as the carbon source in this work.The results show that the cyclic stability and HRD of the alloy first increase and then decrease with the increase of carbon contents.The kinetic results show that the electrocatalytic activity and conductivity of the alloy electrodes can be enhanced by carbon coating.The electrochemical properties of the alloy are the best when the carbon coating content is 0.3 wt%.Compared with the uncoated alloy,the maximum discharge capacity(C_(max)) improves from 354.5 to 359.0 mAh/g,the capacity retention rate after 300 cycles(S_(300)) enhances from 73.15% to 80.01%,and the HRD_(1200) of the alloy enhances from 74.39% to 74.39%.

关键词： La-Y-Ni-based alloy Sucrose Carbon coating electrochemical properties Ni/MH batteries Rare earths

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electrochemical properties of Ca-Pb electrode for calcium-based liquid metal batteries

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1723-1729页

作者： Xiao-hui Ning Chen-zheng Liao Guo-qing Li Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China

The Ca-Pb electrode couple is considered to be one of the least expensive(~36$/(k W·h))among various optional materials for liquid-metal batteries(LMBs).The electrochemical properties of Ca-Pb alloy in a Ca|Li Cl-Na Cl-Ca Cl_(2)|Pb cell were investigated in this paper.The electrode potential maintained a linear relationship in the current density range of 50-200 m A·cm^-2,which indicates that the alloying and dealloying processes of Ca with Pb attained rapid charge transfer and mass transport in the interface between the liquid electrode and electrolyte.The Ca-Pb electrode exhibited remarkable properties with a high discharge voltage of 0.6 V,a small self-discharge current density(98.84%).The postmortem analysis showed that intermetallics Ca Pb3 and Ca Pb were uniformly distributed in the electrode with different molar fractions of Ca,which indicates that the nucleation of solid intermetallics did not hinder the diffusion of Ca in the electrode.This investigation on Ca-Pb electrode sheds light on the further research and the design of electrodes for Ca-based LMBs.

关键词： liquid-metal battery molten salt electrolyte Ca-Pb alloys electrochemical properties

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electrochemical properties of gadolinium on liquid gallium electrode in LiCl-KCl eutectic

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Journal of Rare Earths 2018年第6期36卷 656-661页

作者： Bo Li Kui Liu Jingwen Pang Liyong Yuan Yalan Liu Mingzhang Lin School of Nuclear Science and Technology University of Science and Technology of ChinaHefei230026China Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China

This work presents the electrochemical properties of gadolinium(Gd), a significant rare earth element in spent nuclear fuel(SNF), in the LiCl-KCl eutectic. To explore thermodynamic properties of Gd at the liquid gallium(Ga) electrode, experiments were performed both on the inert tungsten(W) and liquid gallium(Ga) electrode at different temperatures in a range from 723 to 823 K, which show that the Gd metal can be oxidized to Gd(Ⅲ) by exchanging of 3 electrons. electrochemical techniques including cyclic voltammetry(CV), open circuit potential(OCP), potentiostatic electrolysis and galvanostatic electrolysis were utilized to detect the electrochemical behavior and evaluate standard apparent potential of the Gd(Ⅲ)/Gd couple,and E(Gd(Ⅲ)/Gd)*=-3.456 + 6.2×10-4T(±0.046)( vs Cl2/Cl-) is obtained.In addition, electromotive force(EMF) and coulometric titration were employed to calculate the activity and activity coefficient of Gd in metal Ga. After calculation, the activity is 1.791×10-15at 723 K and function of activity coefficient and temperature is lgγ = 3.485-10927/T(±0.0875).

关键词： LiCl-KCl eutectic electrochemical properties Gadolinium Liquid Ga Rare earths

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electrochemical properties of spinel compound LiNi_(0.5)Mn_(1.2)Ti_(0.3)O_4 as cathode materials for lithium ion batteries

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Rare Metals 2010年第6期29卷 572-575页

作者： LIU Guoqiang,GUO Qingshan,LI Xiaoxia,and WU Qiuyang School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China School of Materials and Metallurgy Northeastern University Shenyang China

The electrochemical properties of spinel compound LiNi0.5Mn1.2Ti0.3O4 were investigated in this study.The chemicals LiAc·2H2O,Mn（Ac）2·2H2O,Ni（Ac）2·4H2O,and Ti（OCH3）4 were used to synthesize LiNi0.5Mn1.2Ti0.3O4 by a simple sol-gel method.The discharge capacity of the sample reached 134 mAh/g at a current rate of 0.1C.The first and fifth cycle voltammogram almost overlapped,which showed that the prepared sample LiNi0.5Mn1.2Ti0.3O4 had excellent good cycle performance.There were two oxidation peaks at 4.21 V and 4.86 V,and two reduction peaks at 4.55 V and 3.88 V in the cycle voltammogram,respectively.By electrochemical impedance spectroscopy and its fitted result,the lithium ion diffusion coefficient was measured to be approximately 7.76 × 10？11 cm2/s.

关键词： lithium batteries cathode materials sol-gel process electrochemical properties

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electrochemical properties and Crystal Structure of Rare Earth AB_(3.5)-Type Alloy as Negative Electrode Material in MH-Ni Battery

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Journal of Rare Earths 2003年第S1期21卷 162-164页

作者：张新波柴玉俊印文雅赵敏寿 Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChinese Academy of Sciences

The electrochemical characteristics and crystal structure of metal hydride electrode of AB_(3.5)-type alloy was studied. The electrochemical properties of the metal hydride electrode were investigated at room temperature and -30 ℃. The partial substitution of Ni by Al element causes an expansion of the lattice cell and increases the specific capacity and rate discharge ability of the alloy.

关键词： metal hydride electrode electrochemical properties MH-Ni battery lattice cell rare earths

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