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Journal of Energy Chemistry 2021年第10期30卷 574-581,I0015页

作者： Qi-Qi Qiu Shan-Shan Yuan Jian Bao Qin-Chao Wang Xin-Yang Yue Xun-Lu Li Xiao-Jing Wu Yong-Ning Zhou Department of materials Science Fudan UniversityShanghai 200433China

Ni-rich layered oxide LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)(x≥0.8)is the most promising cathodes for future high energy automotive lithium-ion ***,its application is hindered by the undesirable cycle stability,mainly due to the irreversible structure change at high ***,we demonstrate that F substitution with the appropriate amount(1 at%)is capable for improve the electrochemical performance of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2) cathode *** is revealed that F substitution can reduce cation mixing,stabilize the crystal structure and improve Li transport *** resulted LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(1.99)F_(0.01)cathode can deliver a high capacity of 194.4 mAh g^(-1) with capacity retention of 95.5%after 100 cycles at 2 C and 165.2 mAh g^(-1) at 5 ***-situ synchrotron X-ray technique proves that F ions in the cathode materials can suppress the irreversible phase transition from H2 phase to H3 phase in high voltage region by preventing oxygen gliding in a-b planes,ensuring a long-term cycle stability.

关键词： Lithium batteries cathode materials Nickel-rich Phase transition Fluorine substitution

Novel P2-type layered medium-entropy ceramics oxide as cathode material for sodium-ion batteries

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Journal of Advanced Ceramics 2022年第1期11卷 158-171页

作者： Shengxue YAN Shaohua LUO Liu YANG Jian FENG Pengwei LI Qing WANG Yahui ZHANG Xin LIU School of materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004China School of Resources and materials Northeastern University at QinhuangdaoQinhuangdao 066004China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

High-entropy oxides(HEOs)and medium-entropy oxides(MEOs)are new types of single-phase solid solution *** have rarely been reported as positive electrode material for sodium-ion batteries(SIBs).In this study,we first proposed the concept of the application of MEOs in SIBs.P2-type 3-cation oxide Na_(2/3)Ni_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)and 4-cation oxide Na_(2/3)Ni_(1/3)Mn_(1/3)Fe_(1/3-x)Al_(x)O_(2)(NaNMFA)were prepared using the solid-state method,rather than the doping *** addition,the importance of the concept of entropy stabilization in material performance and battery cycling was demonstrated by testing 3-cation(NaNMF)and 4-cation(NaNMFA)oxides in the same ***,NaNMFA can provide a reversible capacity of about 125.6 mAh-g”1 in the voltage range of 2-4.2 V,and has enhanced cycle *** capacity and decay law of the MEO batteries indicate that the configurational entropy(1.28 R(NaNMFA)>1.10 R(NaNMF))of the cationic system,is the main factor affecting the structural and cycle stability of the electrode *** work emphasizes that the rational design of MEOs with novel structures and different electrochemically active elements may be the strategy for exploring high-performance SIB cathode materials in next-generation energy storage devices.

关键词： cathode materials medium-entropy oxide(MEO) configuration entropy electrochemical performance sodium-ion batteries(SIBs)

Synthesis and characterization of LiNi_(0.95-x)Co_xAl_(0.05)O_2 for lithium-ion batteries

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Rare Metals 2006年第4期25卷 303-308页

作者： ZHU Xianjun ZHAN Hui LIU Hanxing ZHOU Yunhong State Key Laboratory of Advanced Technology and Processing for materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Chemical and Molecular Science Wuhan University Wuhan 430072 China

Samples of LiNi0.95-xCoxAl0.05O2 （x = 0.10 and 0.15） and LiNiO2, synthesized by the solid-state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3, and AI（OH）3 under an oxygen stream, were characterized by TG-DTA, XRD, SEM, and electrochemical tests. Simultaneous doping of cobalt and aluminum at the Ni-site in LiNiO2 was tried to improve the cathode performance for lithium-ion batteries. The results showed that co-doping （especially, 5 at.% A1 and 10 at.% Co） definitely had a large beneficial effect in increasing the capacity （186.2 mA.h/g of the first discharge capacity for LiNio.s.42OoaoAlo.0502） and cycling behavior （180.1 mA-h/g after 10 cycles for ***2） compared with 180.7 mA.h/g of the first discharge capacity and 157.7 mA.h/g of the tenth discharge capacity for LiNiO2, respectively. Differen- tial capacity versus voltage curves showed that the co-doped LiNio.95_***2 had less intensity of the phase transitions than the pristine LiNiO2.

关键词： electrochemistry LiNi0.95-xCoxAl0.05O2 lithium-ion batteries co-doping cathode materials LiNiO2

High performance 0.9LiMnPO4-0.1LiFePO4/C composite

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Science China(Technological Sciences) 2020年第6期63卷 971-976页

作者： LIU Jian ZHANG XianHui YANG WenChao LIU Meng REN ZhongMin ZHANG ShengQi WANG DeYu Ningbo Institute of Material Technology&Engineering Chinese Academy of SciencesNingbo 315201China Tianmu Lake Institute of Advanced Energy Storage Technology Liyang 213300China

The rate performance of lithium manganese phosphate is seriously tarnished by its sluggish surface kinetics,which could be addressed by LiFePO4-surface *** a higher energy output,here we explore thinner coating layers with 10%and 5%LiFePO4 via the lab-developed DMSO assisted *** core-shell structured 0.9LiMnPO4-0.1LiFePO4/C maintains a high specific capacity,153,148 and 140 mA hg-1 under 0.1,1 and 5 C respectively,which are the best results for this composition till *** for 0.95Li MnPO4-0.05 LiFePO4/C,the discharge capacity is lower than 110 mA hg-1 even in 0.1 C,which cannot meet the requirements of practical *** approaches push the manganese ratio of LiMnPO4-based composite to 90%from 80%,further improving the energy-density of the olivine phosphates.

关键词： lithium manganese phosphate core-shell structure cathode materials lithium ion battery

Double spatial confinement on ruthenium nanoparticles inside carbon frameworks as durable catalysts for a quasi-solid-state Li–O_(2) battery

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Carbon Energy 2023年第8期5卷 114-125页

作者： Meiling Wang Ying Yao Feiyang Yang Zhenwu Tang Jingjie Ren Cunzhong Zhang Feng Wu Xiangke Wang Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyBeijingChina Beijing Institute of Technology Chongqing Innovation Center ChongqingChina College of Life and Environmental Sciences Minzu University of ChinaBeijingChina College of Environmental Science and Engineering North China Electric Power UniversityBeijingChina

The rational design of large-area exposure,nonagglomeration,and longrange dispersion of metal nanoparticles(NPs)in the catalysts is critical for the development of energy storage and conversion *** attention has been focused on modulating and developing catalyst interface contact engineering between a carbon substrate and dispersed ***,a highly dispersed ultrafine ruthenium(Ru)NP strategy by double spatial confinement is proposed,that is,incorporating directed growth of metal–organic framework crystals into a bacterial cellulose templating substrate to integrate their respective merits as an excellent electrocatalytic cathode catalyst for a quasi-solid-state Li–O_(2) *** porous carbon matrix with highly dispersed ultrafine Ru NPs is well designed and used as cathode catalysts in a Li–O_(2) battery,demonstrating a high discharge areal capacity of 6.82 mAh cm^(–2) at 0.02 mA cm^(–2),a high-rate capability of 4.93 mAh cm^(–2) at 0.2 mA cm^(–2),and stable discharge/charge cycling for up to 500 cycles(2000 h)with low overpotentials of~1.4 *** fundamental understanding of the structure–performance relationship demonstrates a new and promising approach to optimize highly efficient cathode catalysts for solid-state Li–O_(2) batteries.

关键词： bacterial cellulose cathode materials metal-organic frameworks Ru nanoparticles solid-state Li-O_(2)batteries

Synthesis of LiSm_(0.01)Mn_(1.99)O_4 by molten salt technique

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Journal of Rare Earths 2010年第2期28卷 255-259页

作者： M Helan L John Berchmans Department of Chemistry Jamal Mohamed College (Autonomous) Electropyrometallurgy Division Central Electrochemical Research Institute

Samarium substituted lithium manganese oxide powders were successfully prepared by molten-salt synthesis(MSS) using eutectic mixture of LiCl,SmCl3.6H2O and MnO2 salt at 700 °*** synthesis was carried out in open *** crystalline powders were characterized for their phase identification using X-ray diffraction(XRD) *** physico-chemical properties of the samarium substituted lithium manganese oxide powders were investigated by thermal analysis(TGA/DTA),FT-IR spectroscopy,EDAX,electron par...

关键词： LiSm0.01Mn1.99O4 molten salt synthesis cathode materials rare earth ion

Synthesis and electrochemical properties of Li_2MnSiO_4/C nanoparticles via polyol process

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Rare Metals 2010年第5期29卷 511-514页

作者： LIU Wengang XU Yunhua YANG Rong School of Material Science and Engineering Xi 'an University of Architecture and Technology Xi 'an 710055 China School of Science Xi 'an University of Technology Xi 'an 710048 China

Carbon-coated lithium manganese silicate （Li2MnSiO4/C） nanoparticles were synthesized by polyol process. X-ray diffraction （XRD） patterns of the obtained materials exhibit a good fit with that of the Li2MnSiO4 phase. Field emission scanning electron microscopy （FESEM） images of the obtained samples show that the particle size is only tens of nanometers. The high resolution transmission electron microscopy （HRTEM） analysis shows that the Li2MnSiO4 nanoparticles are surrounded by a very thin film of amorphous carbon. The composite prepared through polyol process shows good performance as cathode materials in lithium cells at room temperature. The charge capacity of the Li2MnSiO4/C samples is 219 mAh/g （about 1.3 Li^＋ per unit formula extracted）, and the discharge capacity is 132 mAh/g （about 0.8 Li^＋ per unit formula inserted） in the first cycle in the voltage range of 1.5-4.8 V. A good capacity cycling maintenance of 81.8% after 10 cycles was obtained.

关键词： lithium ion batteries cathode materials electrochemical properties polyol process silicates

Synthesis and electrochemical characteristics of xLi_2MnO_3·(1-x)Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_2 compounds

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International Journal of Minerals,Metallurgy and materials 2009年第4期16卷 458-462页

作者： Ling-yan Yu Wei-hua Qiu Jia-yuan Huang Fang Lian School of materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Sinosteel Luoyang Institute of Refractories Research Co. Ltd. Luoyang 471039 China

xLi2MnO3·（1-x）Li（Ni1/3Co1/3Mn1/3）O2 （x=0.25, 0.40, 0.55） compounds were prepared by low-heating solid state reaction. In the voltage range of 2.70-4.35 V, the discharge capacity of the electrode decreased with the increase of x, with a better cyclability. However, when cycled between 2.7 and 4.6 V, the cathodes delivered much larger capacities and their capacities increased with the introduction of Li2MnO3. Moreover, it was found that the discharge capacity gradually increased with the cycle number. The reason for this phenomenon was discussed. It was found that the relatively low cut-off potential made the activation of the Li2MnO3 component in the compound a gradual process, which caused the increasing capacity.

关键词： lithium-ion batteries cathode materials synthesis method layered oxides

Synthesis and electrochemical properties of Ce-doped LiNi_(1/3)Mn_(1/3)Co_(1/3)O_2 cathode material for Li-ion batteries

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Journal of Rare Earths 2011年第9期29卷 891-895页

作者：钟胜奎王友刘洁群万康吕凡 Shagang School of Iron and Steel Soochow University College of Chemistry and Bioengineering Guilin University of Technology

The layered material of Ce-doped LiNi1/3Mn1/3Co1/3O2 with α-NaFeO2 was synthesized by a co-precipitation method. X-ray diffraction （XRD） showed that Ce-doped LiNi1/3Mn1/3Co1/3O2 had the same layered structure as the undoped LiNi1/3Mn1/3Co1/3O2. The scanning electron microscopy （SEM） images exhibited that the particle size of Ce-doped LiNi1/3Mn1/3Co1/3O2 was smaller than that of the undoped LiNi1/3Mn1/3Co1/3O2. The Ce-doped LiNi1/3Mn1/3Co1/3O2 samples were investigated on the Li extraction/insertion performances through charge/discharge, cyclic voltammogram （CV）, and electrochemical impedance spectra （EIS）. The optimal doping content of Ce was x=0.02 in the LiNi1/3-xMn1/3Co1/3CexO2 samples to achieve high discharge capacity and good cyclic stability. The electrode reaction reversibility was enhanced, and the charge transfer resistance was decreased through Ce-doping. The improved electrochemical performances of the Ce-doped LiNi1/3Mn1/3Co1/3O2 cathode materials were attributed to the addition of Ce4＋ ion by stabilizing the layer structure.

关键词： lithium-ion batteries cathode materials electrochemical characterizations rare earths

Synthesis and electrochemical properties of Li_(1.03)Co_(0.1)Mn_(1.9)F_zO_(4-z) material for lithium-ion batteries

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Transactions of Nonferrous Metals Society of China 2013年第8期23卷 2312-2316页

作者：刘文静张云王辅卢超四川大学材料科学与工程学院成都610064

Lil.03Co0.10MnL90FxO4-x （z=0, 0.05, 0.10, 0.15 and 0.20） cathode materials were synthesized by solid-state reaction using Mn203, Li2CO3, C0203 and LiF as raw materials. The chemical compositions of ***.9FzO4-z were examined by inductively coupled plasma （ICP） and potentiometric analysis, the effects of F-substitution contents on structure, morphology and electrochemical performance of spinel ***.9004 were studied by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical measurements. It is found that the Lix.03 Co0.10Mnl.9oFzOa_z samples display a single phase of cubic spinel structure. The lattice parameters increase with the increase of F content when z〈_0.10. However, the lattice parameters begin to decrease when F content continues to increase. The results show that an appropriate amount ofF substitution for O element with Li＋, Co3＋ improves discharge capacity and structure stability of the materials. The Lil.03Co0.10Mnl.90FoAsO3.s5 sample shows an initial discharge capacity of 111.0 mA.h/g and has capacity retention of 97.0% after 30 cycles at 0.2C.

关键词： cathode materials solid-state reaction F-substitution cycle performance