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Multi-time scale identification of key kinetic processes for lithium-ion batteries considering variable characteristic frequency

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Journal of Energy Chemistry 2023年第7期82卷 521-536,I0011页

作者： Haotian Shi Shunli wang Jianhong Liang Paul Takyi-Aninakwa Xiao Yang Carlos Fernandez liping wang School of Information Engineering Southwest University of Science and TechnologyMianyang 621010SichuanChina Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China School of Pharmacy and Life Sciences Robert Gordon UniversityAberdeen AB10-7GJUK

The electrification of vehicles puts forward higher requirements for the power management efficiency of integrated battery management systems as the primary or sole energy *** this paper,an efficient adaptive multi-time scale identification strategy is proposed to achieve high-fidelity modeling of complex kinetic processes inside the *** specifically,a second-order equivalent circuit model network considering variable characteristic frequency is constructed based on the high-frequency,medium-high-frequency,and low-frequency characteristics of the key kinetic ***,two coupled sub-filters are developed based on forgetting factor recursive least squares and extended Kalman filtering methods and decoupled by the corresponding time-scale *** coupled iterative calculation of the two sub-filter modules at different time scales is realized by the voltage response of the kinetic diffusion *** addition,the driver of the low-frequency subalgorithm with the state of charge variation amount as the kernel is designed to realize the adaptive identification of the kinetic diffusion process ***,the concept of dynamical parameter entropy is introduced and advocated to verify the physical meaning of the kinetic *** experimental results under three operating conditions show that the mean absolute error and root-mean-square error metrics of the proposed strategy for voltage tracking can be limited to 13 and 16 mV,***,from the entropy calculation results,the proposed method can reduce the dispersion of parameter identification results by a maximum of 40.72%and 70.05%,respectively,compared with the traditional fixed characteristic frequency *** proposed method paves the way for the subsequent development of adaptive state estimators and efficient embedded applications.

关键词： Lithium-ion battery Kinetic parameters Entropy evaluation Parameter identification Frequency characteristic

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Is the hardness of material harder than diamond reliable?

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Journal of Materials Science & Technology 2023年第13期144卷 111-117页

作者： Jin Liu Yongtao Zou Guodong David Zhan Pei wang Xiaozhi Yan Duanwei He liping wang Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China School of Mechanical Engineering Jingchu University of TechnologyJingmen 448000China Academy for Advanced Interdisciplinary Studies and Department of PhysicsSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Ultraintense Laser&Advanced Material Technology College of Engineering Physicsand Center for Advanced Material Diagnostic TechnologyShenzhen Technology UniversityShenzhen 518118China Drilling Technology Division Exploration and Petroleum Engineering Center-Advanced Research Center(EXPEC ARC)Saudi AramcoDhahran 31311Saudi Arabia

With the development of new synthesis methods and chemistries,a number of new superhard materials have been reported to be harder than *** such materials are highly desirable due to their wide-ranging applications,there are some inherent uncertainties in the methods utilized to determine and define the hardness of such *** this paper,we employed the standard Vickers diamond indenter and substitute indenters with the same shape to measure the hardness of nine ceramics and superhard materials within well-defined criteria and methodology,for the assessment of consistency in the hardness *** findings and the developed testing method in the current study have broad implications in characterizing new and emerging superhard materials,leading to new discoveries.

关键词： Vickers hardness Superhard materials Emerging materials Applicability

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Regional features of topographic relief over the Loess Plateau,China:evidence from ensemble empirical mode decomposition

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Frontiers of Earth Science 2020年第4期14卷 695-710页

作者： Yongjuan Liu Jianjun Cao liping wang Xuan Fang Wolfgang Wagner School of Environment Science and Spatial Informatics China University of Mining and TechnologyXuzhou221116China School of Geography Science/Key Laboratory of Virtual Geographic Environment of Ministry of Education Nanjing Normal UniversityNanjing210023China School of Environmental Science Nanjing Xiaozhuang UniversityNanjing211171China Department of Geodesy and Geoinformation Vienna University of TechnologyVienna1040Austria

Landforms with similar surface matter compositions,endogenic and exogenic forces,and development histories tend to exhibit significant degrees of self-similarity in morphology and spatial *** loess hill-gully areas,ridges and hills have similar topographic relief characteristics and present nearly periodic variations of similar repeating structures at certain spatial scales,which is termed the topographic relief period(TRP).This is a relatively new concept,which is different from the degree of relief,and describes the fluctuations of the terrain from both horizontal and vertical(cross-section)perspectives,which can be used for in-depth analysis of 2-D topographic relief *** technique provides a new perspective for understanding the macro characteristics and differentiation patterns of loess *** investigate TRP variation features of different landforms on the Loess Plateau,China,by extracting catchment boundary profiles(CBPs)from 5 m resolution digital elevation model(DEM)*** profiles were subjected to temporal-frequency analysis using the ensemble empirical mode decomposition(EEMD)*** results showed that loess landforms are characterized by significant regional topographic relief;the CBP of 14 sample areas exhibited an overall pattern of decreasing TRPs and increasing topographic relief spatial frequencies from south to *** to the TRPs and topographic relief characteristics,the topographic relief of the Loess Plateau was divided into four types that have obvious regional *** findings of this study enrich the theories and methods for digital terrain data analysis of the Loess *** study should undertake a more in-depth investigation regarding the complexity of the region and to address the limitations of the EEMD method.

关键词： catchment boundary profile topographic relief period ensemble empirical mode decomposition Loess Plateau

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Efficient prediction of corrosion behavior in ternary Ni-based alloy systems:Theoretical calculations and experimental verification

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Journal of Materials Science & Technology 2023年第36期167卷 94-106页

作者： Xuelian Xiao Keke Chang Kai Xu Ming Lou liping wang Qunji Xue Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Pourbaix diagrams are calculated to describe electrochemical processes for alloys in aqueous *** the multi-component differentiation of alloy systems,the construction of Pourbaix diagrams is fac-ing challenges,especially for non-single-phase alloy *** this study,the simultaneous construction of phase diagrams and Pourbaix diagrams were implemented for predicting the evolution of the phases in the immune and passive *** CALPHAD(CALculation of PHAse Diagram)approach was used to quickly access the Gibbs free energies of various phases and the chemical potential of the elements in the phases from the thermodynamic database of the Ni-Si-Al-Y *** corrosion behavior of two typical Ni-Al-Si and Ni-Al-Y systems was *** and Y were added to Ni-based alloys to produce the solid solutions L12-Ni_(3)(Al,Si)and L12-Ni_(3)Al+Ni_(5)Y,*** showed that NiO and Al_(2)O_(3)make up the passive area of the Ni_(3)Al 1 *** introduction of SiO_(2)and Y(OH)3 in the passive region separately helped to minimize the alloys’susceptibility to ***,Si reduced the thermody-namical possibility of NiO for mation in the passive film,and the addition of Y caused extreme galvanic *** on Ni-based alloys validated the results through electrochemical *** was also discovered that the presence of Ni_(5)Y produced galvanic corrosion and that Si reduced the oxide in the passive film,causing pitting *** corrosion prediction of the quaternary alloys indicates that the solid solution of Si in Ni_(5)Y reduces the galvanic corrosion effect and the dissolution of passive *** current work demonstrates that phase diagrams and Pourbaix diagrams may be efficiently and accurately predicted using a well-constructed thermodynamic database,which has major implications for future studies on the corrosion behavior of multi-component alloys.

关键词： Pourbaix diagrams CALPHAD Ni-based alloys Passive film

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The Superior Colliculus:Cell Types,Connectivity,and Behavior

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Neuroscience Bulletin 2022年第12期38卷 1519-1540页

作者： Xue Liu Hongren Huang Terrance PSnutch Peng Cao liping wang Feng wang Shenzhen Key Lab of Neuropsychiatric Modulation Guangdong Provincial Key Laboratory of Brain Connectome and BehaviorCAS Key Laboratory of Brain Connectome and Manipulationthe Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Michael Smith Laboratories and Djavad Mowafaghian Centre for Brain Health University of British ColumbiaVancouver V6T 1Z4Canada National Institute of Biological Sciences Beijing 100049China

The superior colliculus(SC),one of the most well-characterized midbrain sensorimotor structures where visual,auditory,and somatosensory information are integrated to initiate motor commands,is highly conserved across vertebrate ***,cell-type-specific SC neurons integrate afferent signals within local networks to generate defined output related to innate and cognitive *** review focuses on the recent progress in understanding of phenotypic diversity amongst SC neurons and their intrinsic circuits and long-projection *** further describe relevant neural circuits and specific cell types in relation to behavioral outputs and cognitive *** systematic delineation of SC organization,cell types,and neural connections is further put into context across species as these depend upon laminar ***,we focus on SC neural circuitry involving saccadic eye movement,and cognitive and innate ***,the review provides insight into SC functioning and represents a basis for further understanding of the pathology associated with SC dysfunction.

关键词： Superior colliculus Glutamatergic neurons GABAergic neurons Neuronal circuits Innate behaviors

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Elliptical model for surface topography prediction in five-axis flank milling

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Chinese Journal of Aeronautics 2020年第4期33卷 1361-1374页

作者： liping wang Shuyi GE Hao SIa Liwen GUAN Feiyu DUAN Yuzhe LIU Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Beijing Institute of Astronautical Systems Engineering Beijing 100076China

In five-axis flank milling operations,the intersecting surfaces of different cutting edges create roughness on the milled surfaces that cannot be ignored in situations with strict requirements,especially in aeronautical *** focus on motion problems in milling operations,this paper presents a new model that utilizes elliptical paths as cutting edge trajectories on 3D surface topography machined by peripheral ***,the cutter parallel axis offset and location angle are considered,which change the location of the ellipse center and intersection point of the cutting ***,through the proposed model,the predicted surface topography is obtained,and the factors that affect the development tendency of roughness are ***,the effects of the cutter location position(CLP)geometric parameters,cutter parallel axis offset and curvature on the roughness are evaluated by a numerical ***,machining tests are carried out to validate the model predictions,and the results show that the surface topography predictions correspond well with the experimental results.

关键词： Cutter runout Elliptical paths Five-axis flank milling Surface topography Workpiece curvature

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Design of novel NiSiAlY alloys in marine salt-spray environment:PartⅡ.Al-Ni-Si-Y thermodynamic dataset

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Journal of Materials Science & Technology 2021年第30期89卷 186-198页

作者： Kai Xu Keke Chang Miao Yu Dapeng Zhou Yong Du liping wang Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The NiSiAlY material is a promising candidate to replace NiCrAlY,which can withstand the harsh saltspray conditions in marine *** efficiently design novel NiSiAlY alloys,this work establishes a thermodynamic dataset of the Al-Ni-Si-Y quaternary system using the CALPHAD(CALculation of PHAse Diagrams)*** employ this database to calculate and predict the phase constitutions and solidification behaviors of different NiSiAlY alloys concerning the content variations of Al and *** have further proposed the selection of the NiSiAlY alloys for serving in marine salt-spray environment with three constraints:(i)outstanding mechanical property;(ii)good high-temperature anti-oxidation;(iii)excellent corrosion *** results in a compositional range of the NiSiAlY alloys with 1 wt%

关键词： Materials design NiSiAlY CALPHAD Alloys High-temperature corrosion resistance

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Copper diffusion related phase change and voltage decay in CuS cathode

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Nano Research 2023年第6期16卷 8497-8503页

作者： Jian Zou Zhenrui Wu Ruilin Tang Zhenzhen Ren Xiaobin Niu liping wang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China School of Engineering Faculty of Applied ScienceThe University of British ColumbiaKelowna V1V 1V7Canada

Copper sulfide(CuS)is a promising cathode for lithium-ion batteries(LIBs)due to its impeccable theoretical energy density(~1015 Wh·kg^(−1) and 4743 Wh·L^(−1)).However,it suffers from voltage decay leaded energy density loss and low energy efficiency,which hinders its *** this work,with combined ex-situ/in-situ X-ray diffraction(XRD)and electrochemical analysis,we explore detailed degradation *** the voltage decay,it is attributed to a spontaneous reaction between CuS cathode and copper current collector(Cu CC).This reaction leads to energy density loss and active materials degradation(CuS→Cu_(1.81)S).As for energy efficiency,CuS undergoes a series of phase *** main phase transition processes are CuS→α-LiCuS→Li_(2−x)Cu_(x)S+Cu→Li_(2)S+Cu for discharge;Li_(2)S+Cu→Li_(2−x)Cu_(x)S→β-LiCuS→CuS for ***,α-LiCuS,β-LiCuS,and Li_(2−x)CuxS are newly identified *** phase changes are driven by topotactic-reaction-related copper diffusion and *** work demonstrates the significance of transition-metal diffusion in the intermediates formation and phase change in conversion-type materials.

关键词： copper sulfides conversion-type materials copper diffusion Li-free cathode lithium metal battery

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Study on evaluation standard of uncertainty of design wave height calculation model

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Journal of Oceanology and Limnology 2021年第4期39卷 1188-1197页

作者： Baiyu CHEN Yi KOU Fang WU liping wang Guilin LIU College of Engineering University of California BerkeleyBerkeley 94720USA Dornsife College University of Southern CaliforniaLos Angeles 90007USA Statistics and Applied Probability University of California Santa BarbaraSanta Barbara 93106USA School of Mathematical Sciences Ocean University of ChinaQingdao 266071China College of Engineering Ocean University of ChinaQingdao 266071China

The accurate calculation of marine environmental design parameters depends on the probability distribution model,and the calculation results of different distribution models are often *** is very important to determine which distribution model is more stable and reasonable when extrapolating the recurrence level of the studied sea *** this paper,we constructed an evaluation method of the overall uncertainty of the calculation results and a measurement of the uncertainty of the design parameters derivation model,by incorporating the influence of sample information on the model information entropy,such as sample size,degree of dispersion,and sampling *** show that the sample data size and the degree of dispersion are directly proportional to the information *** the same group of data,the maximum entropy distribution model has the lowest overall uncertainty,while the Gumbel distribution model has the largest overall *** other words,the maximum entropy distribution model has good applicability in the accurate calculation of marine environmental design parameters.

关键词： uncertainty information entropy extreme value distribution model

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A mussel-inspired delivery system for enhancing self-healing property of epoxy coatings

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Journal of Materials Science & Technology 2021年第21期80卷 36-49页

作者： Li Cheng Chengbao Liu Hao Wu Haichao Zhao Feixiong Mao liping wang Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100039China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China

Dopamine(DA), one type of mussel-inspired biological molecules with adhesive nature and corrosion inhibitor property, are often used to functionalize the surfaces of various materials. Herein, we report the application of polydopamine(PDA) microcapsules as novel nanocontainers for the purpose, loading corrosion inhibitor(benzotriazole) in its shell structure, and then were embedded into epoxy coatings to provide self-healing and anti-corrosion protection for carbon steel. Fast release of benzotriazole in acidic environment caused by local corrosion and the chelating effect of PDA-Fe^(3+)can synergistically promote the formation of protective film on bare steel surface, which endows coatings with self-healing functionality. Electrochemical impedance spectroscopy(EIS), local electrochemical impedance spectroscopy(LEIS), and spray tests were conducted to evaluate the active inhibition and corrosion resistance of the loaded coatings. The scratched coating with incorporation of nanocontainers presented better protection performance, exhibiting increased Ro(oxide layer resistance) and R ct(charge transfer resistance) during initial immersion periods. The EIS tests in long-term immersion were also performed to confirm the anti-corrosion effect of composited coatings. These results demonstrated that benzotriazole-decorated PDA capsules dramatically enhanced the self-healing properties and anti-corrosion performance of epoxy coatings with the synergistic help of PDA and benzotriazole.

关键词： Polydopamine capsule Hard template method Self-healing Corrosion protection

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