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Synthesis and performance of carbon-modified LiFePO_4 using an in situ PVA pyrolysis procedure

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Journal of University of Science and Technology Beijing 2007年第6期14卷 562-567页

作者： shaohua luo Zilong Tang Junbiao Lu Linfeng Hu Zhongtai Zhang State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Materials Science and Engineering Northeastern University at Qinhuangdao Branch Qinhuangdao 066004 China

LiFePOa/carbon composite cathode material was prepared by granulating and subsequent pyrolysis processing in N2 atmosphere with polyvinyl alcohol （PVA） as the carbon source. The influences of carbon content on the microstructure and battery performance were investigated. Single LiFePO4 phase and amorphous carbon can be found in the products. A special micro-morphology of the optimum sample was observed. The discharge capacity of the cell with the optimum cathode was 135 mAh.g^-1, close to the charge capacity of 153 mAh.g^-1 at 17 mA.g^-1. The influence of ambient temperature on the cell capacity was investigated. The temperature dependence of its electrochemical characteristic was evaluated by using AC impedance spectroscopy. A new equivalent circuit based on the charge and mass transfer control process in an electrode was proposed to fit the obtained AC impedance spectra. The tendency of every element in the equivalent circuit was used to interpret the temperature dependence of the capacity of the optimum cathode.

关键词： LiFePO4 cathode material temperature-capacity sensitivity AC impedance lithium-ion battery

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)

Research progress of tunnel-type sodium manganese oxide cathodes for SIBs

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Chinese Chemical Letters 2022年第5期33卷 2316-2326页

作者： Jie Feng shaohua luo Kexing Cai Shengxue Yan Qing Wang Yahui Zhang Xin Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004China Qinhuangdao Laboratory of Resources Cleaner Conversion and Efficient Utilization Qinhuangdao 066004China

Among the large energy storage batteries,the sodium ion batteries(SIBs)are attracted huge interest due to the fact of its abundant raw materials and low cost,and has become the most promising secondary ***-type sodium manganese oxides(TMOs)are industrialized cathode materials because of their simple synthesis method and proficient electrochemical ***_(0.44)MnO_(2)(NMO)is considered the best candidate material for all tunnel-type structural *** this paper,the research progress in charge and discharge of cathode materials for tunnel-type structural SIBs is reviewed,the redox mechanism and all sorts of synthesis methods and different coating methods lead to different morphology and electrochemical properties of materials and the classification of electrolytes and nonaqueous *** development and utility of aqueous solutions are discussed,and the mechanism is *** the cationic potential of the transition metal oxide for tunnel structure,plays a vital role in predicting and designing the cathode material of this *** addition,the future opportunities and challenges for such tunnel-type SIBs in this field are described in detail.

关键词： Sodium-ion batteries Na 0.44 MnO_(2) Cathode materials Doping Nonaqueous electrolytes

The mystic role of high-entropy designs in rechargeable metal-ion batteries:A review

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Journal of Energy Chemistry 2024年第11期98卷 441-471页

作者： Yicheng Lin shaohua luo Wei Zhao Qi Sun Jun Cong Pengwei Li Pengyu Li Shengxue Yan School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina Department of Chemistry and Bioscience Aalborg University9220 AalborgDenmark

Rechargeable metal-ion batteries, such as lithium-ion batteries(LIBs) and sodium-ion batteries(SIBs),have raised more attention because of the large demand for energy storage solutions. Undoubtedly, electrode materials and electrolytes are key parts of batteries, exhibiting critical influence on the reversible capacity and span life of the metal-ion battery. Nonetheless, researchers commonly express concerns regarding the stability of both electrodes and electrolytes. Given its commendable stability attributes,high-entropy materials have garnered widespread acclaim and have been applied in many fields since their inception, notably in energy storage. However, while certain high-entropy designs have achieved substantial breakthroughs, some have failed to meet anticipated outcomes within the high energy density energy storage materials. Moreover, there is a lack of comprehensive summary research on the corresponding mechanisms and design principles of high-entropy designs. This review examines the current high-entropy designs for cathodes, anodes, and electrolytes, aiming to summarize the design principle,potential mechanisms, and electrochemical performance. We focus on their structural characteristics,interface characteristics, and prospective development trends. At last, we provide a fair evaluation along-side succinct development suggestions.

关键词： High-entropy materials Energy storage materials Electrodes Electrolytes Interface

Improving the cycling stability and rate capability of LiMn_(0.5)Fe_(0.5)PO_(4)/C nanorod as cathode materials by LiAlO_(2) modification

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Journal of Materiomics 2020年第1期6卷 33-44页

作者： Ting-Feng Yi Ying Li Zikui Fang Ping Cui shaohua luo Ying Xie a School of Materials Science and Engineering Northeastern UniversityShenyang110819China Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin150080China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao066004China School of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshanAnhui243002China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province QinhuangdaoChina

LiMn_(0.5)Fe_(0.5)PO_(4)(LMFP)@C and LMFP@LiAlO_(2)@C nanorods are successfully synthesized by a solvothermal process followed by a calcination at H2/Ar *** carbon coating and LiAlO_(2) coating does not change the morphology and particle size of LMFP,and all samples show nanorod morphology with 50-100 nm in width and 200-300 nm in *** results show that LiAlO_(2) coating can offer rapid charge transfer channels with improved intercalation/de-intercalation kinetics of Li ions,which make an outstanding rate capability and cycling stability of as-synthesized LMFP@LiAlO_(2)@C *** a result,LiAlO_(2) coating effectively improves the rate capability and cycling stability of LMFP cathode even at high discharge ***,LMFP@LiAlO_(2)(5 wt%)@C indicates an outstanding rate performance with a reversible discharge capacity of 137.6 and 113.2 mAh g^(-1) discharged at 0.05 C and 5 C rates,and the composite also shows a good cycle performance with an excellent capacity of 107 mAh g^(-1) and 86.4% capacity retention rate at 5 C rate after 100 ***,the LiAlO_(2) coating can be considered as an effective way to improve the electrochemical properties of LMFP.

关键词： LiAlO_(2) LiMn_(0.5)Fe_(0.5)PO_(4) Cycling stability Cathode material Li-ion battery

Precise tuning of low-crystalline Sb@Sb_(2)O_(3) confined in 3D porous carbon network for fast and stable potassium ion storage

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Journal of Materials Science & Technology 2021年第35期94卷 123-129页

作者： Qun Ma Lida Song Yuan Wan Kangze Dong Zhiyuan Wang Dan Wang Hongyu Sun shaohua luo Yanguo Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004China

Metal antimony(Sb)is a promising anode material of potassium-ion batteries(PIBs)for its high theoretical capacity but limited by its inferior cycle stability due to the serious volume expansion during ***,we design and construct a kind of low-crystalline Sb nanoparticles coated with amorphous Sb2O3 and dispersed into three-dimensional porous carbon via a strategy involving NaCl template-assisted insitu pyrolysis and subsequent low-temperature heat-treated in ***,the crystallinity and ratio of Sb/Sb_(2)O_(3) have been precisely tuned and controlled,and the optimized sample of HTSb@Sb_(2)O_(3)@C-4 displays a high reversible specific capacity of 543.9 m Ah g^(-1) at 0.1 A g^(-1),superior rate capability and excellent cycle stability(~273 m Ah g^(-1) at 2 A g^(-1) after 2000 cycles)as an anode of *** outstanding potassium-ion storage performance can be ascribed to the appropriate crystallinity and the multiplebuffer-matrix structure comprising an interconnected porous conductive carbon to relieve the volume changes and suppress the aggregation of Sb,a Sb nanoparticle core to shorten the ion transport pathways and decrease the mechanical stress,and a low-crystalline Sb_(2)O_(3) as the shell to consolidate the interface between Sb and carbon as well as facilitate the rapid electron *** dynamic analysis shows that the composite is mainly controlled by pseudocapacitance *** work provides a novel thought to design high-performance composite electrode in energy storage devices.

关键词： Potassium-ion batteries Anode Porous carbon Antimony Antimony oxide

Flood Velocity Prediction Using Deep Learning Approach

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Journal of Geodesy and Geoinformation Science 2024年第1期7卷 59-73页

作者： luo shaohua DING Linfang TEKLE Gebretsadik Mulubirhan BRULAND Oddbjørn FAN Hongchao Department of Civil and Environmental Engineering Norwegian University of Science and TechnologyTrondheim 7034Norway

Floods are one of the most serious natural disasters that can cause huge societal and economic *** research has been conducted on topics like flood monitoring,prediction,and loss *** these research fields,flood velocity plays a crucial role and is an important factor that influences the reliability of the *** methods rely on physical models for flood simulation and prediction and could generate accurate results but often take a long *** learning technology has recently shown significant potential in the same field,especially in terms of efficiency,helping to overcome the time-consuming associated with traditional *** study explores the potential of deep learning models in predicting flood *** specifically,we use a Multi-Layer Perceptron(MLP)model,a specific type of Artificial Neural Networks(ANNs),to predict the velocity in the test area of the Lundesokna River in Norway with diverse terrain *** data and flood velocity simulated based on the physical hydraulic model are used in the study for the pre-training,optimization,and testing of the MLP *** experiment indicates that the MLP model has the potential to predict flood velocity in diverse terrain conditions of the river with acceptable accuracy against simulated velocity results but with a significant decrease in training time and testing ***,we discuss the limitations for the improvement in future work.

关键词： flood velocity prediction geographic data MLP deep learning

Progress,challenges,and prospects of spent lithium-ion batteries recycling:A review

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Journal of Energy Chemistry 2024年第2期89卷 144-171,I0005页

作者： Pengwei Li shaohua luo Lin Zhang Qiuyue Liu Yikai Wang Yicheng Lin Can Xu Jia Guo Peam Cheali Xiaoning Xia School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Department of Chemistry and Bioscience Aalborg UniversityAalborg 9220Denmark Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina Department of Materials and Production Aalborg UniversityAalborg 9220Denmark School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The recycling and reutilization of spent lithium-ion batteries(LIBs)have become an important measure to alleviate problems like resource scarcity and environmental *** some progress has been made,battery recycling technology still faces challenges in terms of efficiency,effectiveness and environmental *** review aims to systematically review and analyze the current status of spent LIB recycling,and conduct a detailed comparison and evaluation of different recycling *** addition,this review introduces emerging recycling techniques,including deep eutectic solvents,molten salt roasting,and direct regeneration,with the intent of enhancing recycling efficiency and diminishing environmental ***,to increase the added value of recycled materials,this review proposes the concept of upgrading recycled materials into high value-added functional materials,such as catalysts,adsorbents,and *** life cycle assessment,the paper also explores the economic and environmental impacts of current battery recycling and highlights the importance that future recycling technologies should achieve a balance between recycling efficiency,economics and environmental ***,this review outlines the opportunities and challenges of recycling key materials for next-generation batteries,and proposes relevant policy recommendations to promote the green and sustainable development of batteries,circular economy,and ecological civilization.

关键词： Spent li-ion batteries Recycle Direct regeneration High-value conversion Functional materials

Excess capacity on compound phases of Li_(2)FeTiO_(4) composite cathode materials synthesized by hydrothermal reaction using optional titanium sources to boost battery performance

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Chinese Chemical Letters 2020年第12期31卷 3200-3204页

作者： Liu Yang shaohua luo Yafeng Wang Yang Zhan Qing Wang Yahui Zhang Xin Liu Wenning Mu Fei Teng School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University ar QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei PYrovince Qinhuangdao 066004China Qinhuangdao Laboratory of Resources Cleaner Conversion and Efficient Utilization Qinhuangdao 066004China

Li_(2)FeTiO_(4) composites have been produced using commercial LiAC,FeCl_(2) and different titanium sources by hydrothermal synthesis(HS)at 175℃and subsequent annealing at 700℃.Impure phase TiO_(2),Fe_(2)O_(3) and FeTi0_(4) were detected out among the Li_(2)FeTiO_(4) composites with different titanium *** and nano-sized particles of Li2FeTiO4 were prepared from various titanium raw materials,with nano-sized particles predominating when titanium raw materials were layered hydrogen titanate nanowire(H2Ti3O7 NW,HTO-NW)and titanium oxide nanotubes(TiO_(2) NB).The Li_(2)FeTiO_(4) composites synthesized by HTO-NW shows a primary particle size of 50-200 nm of high crystallinity staggered with undissolved nanowire with a diameter size of about 100 *** samples using one-dimensio nal nanometer titanium oxide(TiO2 NB)as the raw material can get a super high initial discharge capacity of 367.8 mAh/g at the rate of C/10 and excellent cycling *** selection of raw materials and adopting multi-phase modification can be considered as an effective strategy to improve the electro-chemical properties of Li_(2)FeTiO_(4) composite cathode materials for the lithium secondary battery.

关键词： Li_(2)FeTiO_(4)nanocomposites Cathode materials Hydrothermal reaction Lithium ion battery Post-heat-treatment