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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

Microwave synthesis of La_(1-x)Sr_xCo_(1-y)Fe_yO_3 cathode materials for solid oxide fuel cells

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Rare Metals 2010年第6期29卷 576-578页

作者： ZHAI Xiujing,SHI Weixi,FU Yan,and ZHANG Nan School of materials & Metallurgy,Northeastern University,Shenyang 110004,China School of materials & Metallurgy Northeastern University Shenyang China

La1-xSrxCo1-yFeyO3 cathode materials for solid oxide fuel cells were prepared by the microwave synthesis method.The reaction mechanism was studied using a thermal analysis method.The influences of microwave synthesis conditions were examined and the characteristics of the samples were determined by X-ray diffraction and scanning electron microscopy.It was found that the optimum conditions were the microwave power of 800 W and the reaction time of 40 min.Samples with perosvkite-type crystal structure were obtained.The samples consist of uniformly distributed internal particles and the particle size is less than 1 μm.

关键词： solid oxide fuel cells cathode materials microwave synthesis thermal analysis microstructure

Influence of Doping Rare Earth on Performance of Lithium Manganese Oxide Spinels as cathode materials for Lithium-Ion Batteries

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Journal of Rare Earths 2005年第1期23卷 120-123页

作者：唐致远张娜卢星河黄庆华 School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

Some rare earth doping spinel LiMn_(2-x)RE_xO_4 (RE=La, Ce, Nd) cathode materials for lithium ion batteries were synthesized by the solid-state reaction method. The structure characteristics of these produced samples were investigated by XRD, SEM, and particle size distribution analysis. According to the microstructure and charge-discharge testing, the effect of doping rare earth on stabilizing the spinel structure was analyzed. Through a series of doping experiments, it is shown that when the doping content x within the range of 0.01～0.02 the cycle performance of the materials is greatly improved. The discharge capacity of the sample LiMn_(1.98)La_(0.02)O_4, LiMn_(1.98)Ce_(0.02)O_4 and LiMn_(1.98)Nd_(0.02)O_4 remain 119.1, 114.2 and 117.5 mAh·g^(-1) after 50 cycles.

关键词： metallic material cathode materials RE-doping LiMn_2O_4 lithium-ion batteries rare earths

Optimum Preparation Conditions of LiNi_(0.8)Co_(0.2)O_2 and LiNi_(0.95)Ce_(0.05)O_2 as Lithium-Ion Battery cathode materials

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Journal of Rare Earths 2004年第5期22卷 644-648页

作者：豆志河张廷安侯闯 School of materials & Metallurgy Northeastern University Shenyang 110004 China

The preparation of LiNi_(0.8)Co_(0.2)O_2 was discussed by the multiply sintering method for solid reaction, in which the sintered material was smashed, ground and pelletted between two successive sintering steps. The optimum technological condition was obtained through orthogonal experiments by L_9(3~4) and DTA analysis. The result indicates that the factors of effecting the electrochemical properties of synthesized LiNi_(0.8)Co_(0.2)O_2 are molar ratio of Li/Ni/Co, oxygen pressure, homothermal time, the final sintering temperature in turn according to its importance. The oxygen pressure is reviewed independently and the technological condition is further optimized. With the same method, rare earth element Ce was studied as substitute element of Co and the cathode material of LiNi_(0.95)Ce_(0.05)O_2 with excellent electrochemical properties was prepared. The electrochemical testing results of LiNi_(0.8)Co_(0.2)O_2 and LiNi_(0.95)Ce_(0.05)O_2 experimental batteries show that discharge capacities of them reach 165 and 148 mAh·g^(-1) respectively and the persistence is more than 9 h at 3.7 V.

关键词： energy material lithium-ion battery cathode materials LiNi_(0.8)Co_(0.2)O_2 LiNi_(0.95)Ce_(0.05)O_2 multiple sinter method rare earths

cathode materials for Solid Oxide Fuel Cells(SOFC)

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Journal of Rare Earths 1993年第4期11卷 293-299页

作者：夏定国魏秋明朱时珍刘庆国 Laboratory of Solid State Ionics University of Science and Technology BeijingBeijing 100083China

A detailed overview has been given concerning the use of rare earth materials in cathode fabrica- tion of solid oxide fuel cells(SOFC).It is focused on the various synthesis methods of the perovskite-type mixed rare earth oxides and the physical and chemical properties of the materials for cathode application of SOFC.Also discussed is the doping mechanism of the related materials.Documented investigations show that lanthanide of transition metals,especially manganese,chromium doped with strontium are most advan- tageous for the application.The crystallography,defect structure,conductivity and thermal matching with the electrolyte and high temperature stability of cathode in oxidative gases are particularly emphasized.

关键词： Rare earth cathode materials SOFC

Sodium Superionic Conductors(NASICONs)as cathode materials for Sodium‑Ion Batteries

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Electrochemical Energy Reviews 2021年第4期4卷 793-823页

作者： Qingbo Zhou Linlin Wang Wenyao Li Kangning Zhao Minmin Liu Qian Wu Yujie Yang Guanjie He Ivan P.Parkin Paul R.Shearing Dan J.L.Brett Jiujun Zhang Xueliang Sun Institute for Sustainable Energy/College of Sciences Shanghai UniversityShanghai 200444China Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College LondonLondon WC1E 7JEUK Laboratory of Advanced Separations(LAS) Ecole Polytechnique Federale de Lausanne(EPFL)1950 SionSwitzerland Department of Mechanical and materials Engineering University of Western OntarioLondonON N6A 3K7Canada

Sodium-ion batteries(SIBs)have developed rapidly owing to the high natural abundance,wide distribution,and low cost of sodium.Among the various materials used in SIBs,sodium superion conductor(NASICON)-based electrode materials with remarkable structural stability and high ionic conductivity are one of the most promising candidates for sodium storage electrodes.Nevertheless,the relatively low electronic conductivity of these materials makes them display poor electrochemical performance,significantly limiting their practical application.In recent years,the strategies of enhancing the inherent conductivity of NASICON-based cathode materials have been extensively studied through coating the active material with a conductive carbon layer,reducing the size of the cathode material,combining the cathode material with various carbon materials,and doping elements in the bulk phase.In this paper,we review the recent progress in the development of NASICON-based cathode materials for SIBs in terms of their synthesis,characterization,functional mechanisms,and performance validation/optimization.The advantages and disadvantages of such SIB cathode materials are analyzed,and the relationship between electrode structures and electrochemical performance as well as the strategies for enhancing their electrical conductivity and structural stability is highlighted.Some technical challenges of NASICON-based cathode materials with respect to SIB performance are analyzed,and several future research directions are also proposed for overcoming the challenges toward practical applications.

关键词： Sodium-ion battery cathode materials Energy storage Sodium superionic conductor(NASICON)

Progress and perspective of vanadium-based cathode materials for lithium ion batteries

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Tungsten 2021年第3期3卷 279-288页

作者： Yang-Yang Zhou Zi-Ying Zhang Hui-Zhen Zhang Yang Li Ying Weng School of materials Engineering Shanghai University of Engineering ScienceShanghai 201620China School of Management University of Shanghai for Science and TechnologyShanghai 200093China Department of Chemistry Fudan UniversityShanghai 200438China

With the rapid development of various portable electronic devices,lithium ion battery electrode materials with high energy and power density,long cycle life and low cost were pursued.Vanadium-based oxides/sulfides were considered as the ideal next-generation electrode materials due to their high capacity,abundant reserves and low cost.However,the inherent low conductivity and ion diffusion coefficient limit their practical applications in lithium ion batteries.In recent years,vanadium-based electrode materials have been designed into various nanostructures through a variety of nanofabrication processes to overcome the electrochemical performance bottleneck caused by the above disadvantages due to the new properties of nanomaterials that cannot be achieved at the solid level.However,how to obtain high-performance vanadium-based electrode nanomaterials with controllable morphology and structure through low-cost and environmentally friendly processes is still a huge challenge.In this paper,the basic structure,modified morphologies and synthesis methods of vanadium-based electrode materials for lithium ion batteries were reviewed.In addition,the disadvantages,new challenges and future development direction of vanadium electrode materials were also discussed.

关键词： Vanadium-based materials cathode materials Lithium ion batteries Energy storage

Porous CoF2 Spheres Synthesized by a One-Pot Solvothermal Method as High Capacity cathode materials for Lithium-Ion Batteries

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Chinese Journal of Chemistry 2017年第1期35卷 48-54页

作者： Qun Guan Jianli Cheng Xiaodong Li Bin Wang Institute of Chemical materials China Academy of Engineering Physics Mianyang Sichuan 621900 China Sichuan R &D Center of New materials Mianyang Sichuan 621900 China

Up to now, there are rare reports of CoF2 spheres used as high capacity cathode materials. Herein, porous CoF2 spheres were synthesized and studied as cathode materials for LIBs. The porous CoF2 spheres were synthesized by a facile one-pot solvothermal method using a safe and inexpensive ammonium fluoride as the fluorine sources. The nature of the synthesis can avoid using corrosive fluorine sources and additional high-temperature thermal treatment The structure, morphologies and electrochemical performance of the samples obtained at different reaction times and solvothermal temperatures were investigated. The results show that the CoF2 spheres obtained at 200 ℃ for 20 h show better electrochemical performances, including a high initial discharge capacity, good capacity retention and high Coulombic efficiency. It can deliver a high initial discharge capacity of 537.8 mAoh·g-1 and keep 127.4 mA·h.g- 1 after 30 cycles used as cathode materials for lithium-ion batteries. The good electrochemical performances may be attributed to good crystallinity, porous structure and relatively intermediate sphere size.

关键词： CoF2 sphere solvothermal method cathode materials lithium-ion battery

Review on Recent Advances of cathode materials for Potassium-ion Batteries

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Energy & Environmental materials 2020年第1期3卷 56-66页

作者： Mo Sha Long Liu Huaping Zhao Yong Lei Fachgebiet Angewandte Nanophysik Institut fur Physik&IMN MacroNano■(ZIK)Technische Universitat IlmenauIlmenauGermany

Potassium-ion batteries(PIBs) as a promising supplement to lithium-ion batteries have drawn great attention attributing to the abundant potassium resources, the fast-ionic conductivity of potassium ions in electrolyte, and the low standard redox potential of potassium. However, the development of PIBs is still in its infancy, which is largely restricted by the fact that the electrode materials, especially the cathode materials of PIBs, are far from satisfactory in practical applications regarding the capacity, voltage, and cycle life. Therefore, most of current research efforts have been devoted to exploring new and high-performance electrode materials for achieving PIBs with high capacity and voltage as well as excellent cyclability. In this review,the recent advancements on cathode materials for PIBs are specially summarized. Besides, technological developments, scientific challenges, and future research opportunities of cathode materials for PIBs are also briefly outlooked.

关键词： cathode materials electrochemical properties potassium-ion batteries recent development

Synthesis and Characteristics of LiNi0.85Co0.15O2 cathode materials by Particulate Sol-Gel Method for Lithium Ion Batteries

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Chinese Journal of Chemistry 2005年第5期23卷 491-495页

作者：朱先军陈宏浩詹晖刘韩星杨代菱周运鸿 CollegeofChemicalandMolecularScience WuhanUniversityWuhanHubei430072China StateKeyLaboratoryofAdvancedTechnologyformaterialsSynthesisandProcessing WuhanUniversityofTechnologyWuhanHubei430070China

A particulate sol‐gel (PSG) method has been successfully used to prepare LiNi 0.85 Co 0.15 O 2 cathode materials, utilizing the reaction of LiOH·H 2 O with Ni(CH 3 COO) 2 ·4H 2 O and Co(CH 3 COO) 2 ·4H 2 O in water‐ethanol system. The thermal history of the as‐prepared xerogel was established by differential thermal analysis and thermogravimetric analysis. Powder X‐ray diffraction confirmed the formation of layered α‐NaFeO 2 structure at temperature of 700 °C under flowing oxygen. Scanning electron microscope exhibited that the crystalline powder prepared by PSG method had relatively smaller particle size with narrow distribution than the one prepared by solid state reaction. The first discharge capacity of the material by PSG method was 196.4 mAh/g, and the 10th discharge capacity was 189.1 mAh/g at the current density of 18 mA/g between 3.0 and 4.3 V. Its cycling reversibility was observed to be much better than that by solid state reaction, which had 187.3 mAh/g of the first discharge capacity and 167.1 mAh/g of the 10th discharge capacity.

关键词： LiNi0.85Co0.15O2 particulate sol‐gel cathode materials lithium ion battery