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Meticulous guard: The role of Al/F doping in improving the electrochemical performance of high-voltage spinel cathode

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Journal of Materiomics 2021年第3期7卷 585-592页

作者： Yang Yang Yong Wang Zhimin Xue Liheng Zhang Liqin Yan Ying Luo Jingying Xie State Key Laboratory of Space power-Sources technology Shanghai Institute of Space Power-SourcesShanghai200245China Department of Chemical Engineering Shanghai Electrochemical Energy Device Research Center(SEED)Shanghai Jiao Tong UniversityShanghai200240China Department of Environment and Chemical Engineering Yanshan UniversityQinhuangdaoHebei066004China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbinHeilongjiang150001China Shanghai power&Energy Storage Battery System Engineering tech.co.Ltd Shanghai200241China

Spinel LiNi0.5Mn1.5O4,which is considered as one of the most attractive candidates for high energy density battery due to its high voltage platform over 4.7 V,suffers from the side reactions with electrolyte,strong oxidability of Ni4þand therefore the complicated and frangible Solid Electrolyte Interfaces(SEI)layer that hinders the practical application of *** this work,traditional coprecipitation method is applied and improved by anion and cation doping method to construct superior interface on the surface of LiNi0.5Mn1.5O4 to suppress side reactions especially at high *** properties including structure,morphology and electrochemical performance of pristine sample,single-doped and co-doped samples are *** characterizations reveal that the co-doped sample with regular octahedron has a moderate grain size and specific surface area between Al and F single doping,and holds the advantages of rate performance and capacity retention causing by Al doping and better stability under high temperature constructing by *** exhibits the best capacity retention of 92%after 200 cycles under 55 C,which is higher than that of the pristine sample(87%).Analysis of the electrode after cycling shows that doping reduces the thickness of the electrode interface film and the content of inorganic substances such as LiF to improve the interface characteristics and the high temperature cycling *** work has certain significance for the commercial application of LiNi0.5Mn1.5O4.

关键词： Lithium ion battery LiNi0.5Mn1.5O4 Morphology control Suppress side reactions High temperature

Structural evolution of layered oxide cathodes for spent Li-ion batteries:Degradation mechanism and repair strategy

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SusMat 2023年第3期3卷 362-378页

作者： Shan Jin Jianquan Liang Deying Mu Tianning Lin Yuyang Tian Jian Zhang YueWang Meng Chen Qingmo Shi Changsong Dai MIIT Key Laboratory of CriticalMaterials technology for New Energy conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinChina State Grid Heilongjiang Electric power co. Ltd.Electric Power Research InstituteHarbinChina Dongying cospower technology co. Ltd.DongyingChina

Sustainable development has long been recognized as one of the most critical issues in today’s energy and environment-conscious *** has never been more urgent to recycle and reuse the end-of-life cathode ***,this work systematically investigates the structure-critical degradation mechanism of polycrystalline LiNi_(x)co_(y)Mn_(1−x−y)O_(2)(NCM),combining experimental characterization and DFT *** the key degradation factors,a synergistic repair strategy based on deep mechanochemical activation and heat treatment was successfully proposed to direct regenerate the *** indicate the induction and promotion of synergistic repair technique on the reconstruction of particlemorphology,the recovery of the chemical composition and crystal structure,and the favorable transformation of the impurities phase in the failed *** particular,the synergistic repair process induces a gradient distribution of LiF and further enables partial fluorine doping into the NCM surface,forming abundant oxygen vacancies and increasing the content of highly reactive Ni2+.Benefiting from the comprehensive treatment for the multi-scale and multi-form degradation behaviors,the repaired material exhibits a capacity of 176.8 mA h g^(-1)at 0.1 C,which is comparable to the corresponding commercial material(172.8 mA h g^(-1)).The satisfactory capacity of the recovered cathode proves that it is an effective direct renovating strategy.

关键词： cathode material degradation mechanism impurity phase transformation spent lithium-ion batteries synergistic repair strategy

Pt alloy oxygen-reduction electrocatalysts: Synthesis, structure, and property

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Chinese Journal of Catalysis 2020年第5期41卷 739-755页

作者： Xiao Xia Wang Joshua Sokolowski Hui Liu Gang Wu School of Mechanical and power Engineering East China University of Science and TechnologyShanghai 200237China Department of Chemical and Biological Engineering University at BuffaloThe State University of New York BuffaloNY 14260USA Shanghai power&Energy Storage Battery System Engineering tech.co.Ltd. Shanghai 200241China

Proton exchange membrane fuel cells(PEMFCs) are considered a promising power source for electric vehicles and stationary residential applications. However, current PEMFCs have several problems that require solutions, including high cost, insufficient power density, and limited performance durability. A kinetically sluggish oxygen reduction reaction(ORR) is primarily responsible for these issues. The development of advanced Pt-based catalysts is crucial for solving these problems if the large-scale application of PEMFCs is to be realized. In this review, we summarize the recent progress in the development of Pt M alloy(M = Fe, co, Ni, etc.) catalysts with an emphasis on ordered Pt M intermetallic catalysts, which exhibit significantly enhanced activity and stability. In addition to exploring the intrinsic catalytic performance in traditional aqueous electrolytes via engineering nanostructures, morphologies, and crystallinity of Pt M particles, we highlight recent efforts to study catalysts under real fuel cell environments by the membrane electrode assembly(MEA).

关键词： Proton exchange membrane fuel cell Oxygen reduction reaction Low Pt catalyst Catalytic activity Stability

Artificial Bear Bile:A Novel Approach to Balancing Medical Requirements and Animal Welfare

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Engineering 2024年第7期38卷 100-112页

作者： Yong Li Yuhong Huang Nan Feng Heping Zhang Jing Qu Shuanggang Ma Yunbao Liu Jiang Li Shaofeng Xu Ling Wang Mi Zhang Jie Cai Weiping Wang Ru Feng Hang Yu Bo Yu Dailiang Liang Heping Qin Suxiang Luo Yanfen Li Meifeng Li Ruihua Wang Chen Ma Yan Wang Xiaobo Cen Xiaoxian Xu Boli Zhang Xiaoliang Wang Shishan Yu State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China The Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine Tianjin 300250China Zhongshan Belling Biotechnology co. Ltd.Zhongshan 528437China Zhongshan Anshi Biopharmaceutical co. Ltd.Zhongshan 528437China WestChina-Frontier pharma tech co. Ltd.Chengdu 610041China Tianjin University of Traditional Chinese Medicine Tianjin 301617China

Bear bile has been a valuable and effective medicinal material in traditional Chinese medicine(TCM)for over 13 ***,the current practice of obtaining it through bear farming is under scrutiny for its adverse impact on bear ***,we present a new approach for creating artificial bear bile(ABB)as a high-quality and sustainable alternative to natural bear *** study addresses the scientific challenges of creating bear bile alternatives through interdisciplinary collaborations across various fields,including resources,chemistry,biology,medicine,pharmacology,and TCM.A comprehensive efficacy assessment system that bridges the gap between TCM and modern medical terminology has been established,allowing for the systematic screening of therapeutic *** the utilization of chemical synthesis and enzyme engineering technologies,our research has achieved the environmentally friendly,large-scale production of bear bile therapeutic compounds,as well as the optimization and recomposition of ABB *** resulting ABB not only closely resembles natural bear bile in its composition but also offers advantages such as consistent product quality,availability of raw materials,and independence from threatened or wild *** preclinical efficacy evaluations have demonstrated the equivalence of the therapeutic effects from ABB and those from commercially available drained bear bile(DBB).Furthermore,preclinical toxicological assessment and phase I clinical trials show that the safety of ABB is on par with that of the currently used *** innovative strategy can serve as a new research paradigm for developing alternatives for other endangered TCMs,thereby strengthening the integrity and sustainability of TCM.

关键词： Artificial bear bile Chemical profile Formula optimization pharmacodynamic consistency Preclinical toxicological assessment

An Image Fingerprint and Attention Mechanism Based Load Estimation Algorithm for Electric power System

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computer Modeling in Engineering & Sciences 2024年第7期140卷 577-591页

作者： Qing Zhu Linlin Gu Huijie Lin Electricity technology Branch Nari Technology Co.Ltd.Nanjing211106China NARI-tech Nanjing control Systems co. Ltd.Nanjing211106China

With the rapid development of electric power systems,load estimation plays an important role in system operation and ***,load estimation techniques contain traditional,time series,regression analysis-based,and machine learning-based *** the machine learning-based method can lead to better performance,in this paper,a deep learning-based load estimation algorithm using image fingerprint and attention mechanism is ***,an image fingerprint construction is proposed for training *** the data preprocessing,the training data matrix is constructed by the cyclic shift and cubic spline ***,the linear mapping and the gray-color transformation method are proposed to form the color image ***,a convolutional neural network(CNN)combined with an attentionmechanism is proposed for training performance *** last,an experiment is carried out to evaluate the estimation *** with the support vector machine method,CNN method and long short-term memory method,the proposed algorithm has the best load estimation performance.

关键词： Load estimation deep learning attention mechanism image fingerprint construction

Optimized design of the pneumatic precision seed-metering device for carrots

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International Journal of Agricultural and Biological Engineering 2023年第6期16卷 134-147,F0003页

作者： Dinghao Feng Xinping Sun Hua Li Xindan Qi Yongjian Wang Samuel Mbugua Nyambura college of Mechanical and power Engineering Nanjing Tech UniversityNanjing 211816China Key Laboratory of Intelligent Agricultural Equipment in Jiangsu Province Nanjing Agricultural UniversityNanjing 210031China college of Engineering Nanjing Agricultural UniversityNanjing 210031China CSSC Jiangnan Shipyard(Group)co. Shanghai 201913China

The small size, light weight, irregular shape, and impurities that characterize seed groups increase clogging tendencies in the traditional seed-metering device thereby making it difficult to achieve high-speed precision seeding. A pneumatic seed-metering device with good seed-filling performance for carrot was designed in this study. By analyzing the movement state of seeds in the device under the theoretical condition, it was concluded that the minimum critical negative pressure value of air chamber was 0.32 kPa, which provided a theoretical basis for simulation and testing. ANSYS 17.0 Software was used to simulate the shape of the seeding plate hole. By comparing the pressure, air flow stability between the suction surface and the plug removal surface of the convection field, it was concluded that the conical hole was optimal. A bench verification test was conducted on the device. The average qualified rate, missing rate, and replaying rate were 81.48%, 4.07%, and 14.45%, respectively, which provided a strong reference for the design of carrot precision seed-metering device.

关键词： seed-metering device carrot precision seeding bench verification test

Interface repairing for AA5083/T2 copper explosive composite plate by friction stir processing

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Transactions of Nonferrous Metals Society of China 2021年第9期31卷 2585-2596页

作者： Jian WANG Xiao-wei WANG Bo LI Cheng CHEN Xiao-feng LU School of Mechanical and power Engineering Nanjing Tech UniversityNanjing 211816China Sunpower technology(Jiangsu)co. Ltd.Nanjing 211112China Additive Manufacturing and Intelligent Equipment Research Institute School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

Multi-pass friction stir processing(M-FSP)was performed to repair the interface defects of AA5083/T2 copper explosive composite *** interface morphology and its bonding mechanism were *** results show that higher rotation speed and lower transverse speed produce more heat generated during *** defect-free and good mechanical properties of the AA5083/T2 copper composite plate can be obtained under the condition of the rotation speed of 1200 r/min,the transverse speed of 30 mm/min and the overlap of 2/***,M-FSP changes the interface bonding mechanism from metallurgical bonding to vortex connection,improving the bonding strength of composite plate,which can guarantee the repairing quality of composite plates.

关键词： friction stir processing aluminum/copper composite plate interface repairing mechanical properties

Simulation of the fatigue-wear coupling mechanism of an aviation gear

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Friction 2021年第6期9卷 1616-1634页

作者： Boyu ZHANG Huaiju LIU Caichao ZHU Yibo GE State Key Laboratory of Mechancial Transmissions Chongqing UniversityChongqing 400044China Shanghai Peentech Equipment tech.co.Ltd. Shanghai 201800China

The contact fatigue of aviation gears has become more prominent with greater demands for heavy-duty and high-power density ***,the coexistence of tooth contact fatigue damage and tooth profile wear leads to a complicated competitive mechanism between surface-initiated failure and subsurface-initiated contact fatigue *** address this issue,a fatigue-wear coupling model of an aviation gear pair was developed based on the elastic-plastic finite element *** tooth profile surface roughness was considered,and its evolution during repeated meshing was simulated using the Archard wear *** fatigue damage accumulation of material points on and underneath the contact surface was captured using the Brown-Miller-Morrow multiaxial fatigue *** elastic-plastic constitutive behavior of damaged material points was updated by incorporating the damage *** in the wear depth and fatigue damage around the pitch point are described,and the effect of surface roughness on the fatigue life is *** results reveal that whether fatigue failure occurs initially on the surface or sub-surface depends on the level of surface *** wear on the asperity level alleviates the local stress concentration and leads to a longer surface fatigue life compared with the result without wear.

关键词： gear contact fatigue tooth wear surface roughness damage accumulation

Morphologies of secondary austenite in 2507 duplex stainless steel after heat treatment

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Journal of Iron and Steel Research International 2022年第6期29卷 994-1003页

作者： Xiao-han Wu Zhi-gang Song Bao-shun Wang Ming-hua Wu Qi-liang Nai Liang Yao Han Feng Wen-jie Zheng School of Material Science and Engineering University of Science and Technology BeijingBeijing 100083China Special Steel Institute Central Iron&Steel Research InstituteBeijing 100081China Engineering Research Center of High-Performance Nuclear power Pipe Forming of Zhejiang Province Huzhou 313028ZhejiangChina Yongxing Special Stainless-Steel co. Ltd.Huzhou 313005ZhejiangChina Zhejiang Jiuli Hi-tech Metals co. Ltd.Huzhou 313028ZhejiangChina

The microstructure evolution of secondary austenite in 2507 duplex stainless steel was investigated by means of optical metallography,scanning electron microscopy and confocal scanning laser *** types of secondary austenite(γ2)morphologies including partially transformed austenite,grain boundary austenite,Widmannstätten austenite(WA)and intragranular austenite could be formed during cooling after solution *** was concluded that secondary austenite morphology was mainly dependent on cooling *** mechanisms of WA formation were *** nucleated at grain boundary of ferrite or at the formed phase *** electron microscopy(TEM)analysis displayed that WA grew in parallel to the *** effects of Cr_(2)N on secondary austenite precipitation were discussed in *** Cr_(2)N was involved,a mechanism was proposed that secondary austenite formed by element diffusion,leading to the migration of the austenite–ferrite ***_(2)N acted as the nucleation sites forγ2 and provided the nitrogen for the transformation;meanwhile,the precipitation of Cr_(2)N during the rapid cooling was captured by TEM.A process of nucleation followed by diffusion was concluded to be the formation of secondary austenite with no Cr_(2)N *** decomposition of secondary austenite was also studied,which was found to be a diffusion mechanism followed by displacement in connection with the element distribution.

关键词： Secondary austenite Duplex stainless steel Heat treatment cooling rate Element diffusion