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Comparative Study on Traction Battery Charging Strategies from the Perspective of Material Structure

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Automotive Innovation 2022年第4期5卷 427-437页

作者： Mengyang Gao Liduo Chen Tianyi Ma Weijian Hao Zhipeng Sun Yuhan Sun Shiqiang Liu China Automotive Technology and Research Center Co.Ltd Tianjin 300300China CAT ARC NEV Test Center(Tianjin)Co.Ltd Tianjin 300300China

The service life of an electric vehicle is,to some extent,determined by the life of the traction battery.A good charging strat-egy has an important impact on improving the cycle life of the lithium-ion battery.Here,this paper presents a comparative study on the cycle life and material structure stability of lithium-ion batteries,based on typical charging strategies currently applied in the market,such as constant current charging,constant current and constant voltage charging,multi-stage constant current charging,variable current intermittent charging,and pulse charging.Compared with the reference charging strategy,the charging capacity of multi-stage constant current charging reaches 88%.Moreover,the charging time is reduced by 69%,and the capacity retention rate after 500 cycles is 93.3%.Through CT,XRD,SEM,and Raman spectroscopy analysis,it is confirmed that the smaller the damage caused by this charging strategy to the overall structure of the battery and the layered structure and particle size of the positive electrode material,the higher the capacity retention rate is.This work facilitates the development of a better charging strategy for a lithium-ion battery from the perspective of material structure.

关键词： Traction battery Charging strategy Cycle life Material evolution

The Global Security Initiative: Its Relevance, Rationale and Delivery

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Contemporary World 2024年第2期 34-38页

作者： liu shiqiang School of Marxism at Southwestern University of Finance and Economics

Today,our world is undergoing profound changes unseen in a century.Global security landscape is becoming ever more unstable and uncertain.In the face of growing deficits in security,Chinese President Xi Jinping put forward the Global Security Initiative(GSI),offering a clear answer to the question of the times:what kind of security concept does the world need,and how can we achieve common security?It is of great significance to fully grasp the relevance of and the rationale for the GSI,and push for its strategic delivery,so as to contribute to the long-term peace and stability of the world.

关键词： Rational offering rational

Study about thermal runaway behavior of high specific energy density Li-ion batteries in a low state of charge

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Journal of Energy Chemistry 2021年第1期30卷 20-27,I0002页

作者： Shiqiang Liu Tianyi Ma Zhen Wei Guangli Bai Huitian liu Dapeng Xu Zhongqiang Shan Fang Wang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Evaluation Technology for Electric Vehicles China Automotive Technology and Research Center Co.Ltd.(CATARC)Tianjin 300300China

Lithium-ion batteries are widely used in electric vehicles and electronics, and their thermal safety receives widespread attention from consumers. In our study, thermal runaway testing was conducted on the thermal stability of commercial lithium-ion batteries, and the internal structure of the battery was analyzed with an in-depth focus on the key factors of the thermal runaway. Through the study of the structure and thermal stability of the cathode, anode, and separator, the results showed that the phase transition reaction of the separator was the key factor affecting the thermal runaway of the battery for the condition of a low state of charge.

关键词： Lithium-ion battery Thermal runaway State of charge Thermal stability

Feeding citrus flavonoid extracts decreases bacterial endotoxin and systemic inflammation and improves immunometabolic status by modulating hindgut microbiome and metabolome in lactating dairy cows

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Animal Nutrition 2023年第2期13卷 386-400页

作者： Yuchao Zhao shiqiang Yu liuxue Li Huiying Zhao Yuqin Li Linshu Jiang Ming liu Beijing Key Laboratory of Dairy Cow Nutrition Animal Science and Technology CollegeBeijing University of AgricultureBeijing102206China Beijing Beinong Enterprise Management Co. Ltd.Beijing102206China

The objectives of this study were to determine the effects of dietary supplementation with citrus flavonoid extracts(CFE)on milk performance,serum biochemistry parameters,fecal volatile fatty acids,fecal microbial community,and fecal metabolites in dairy cows.Eight multiparous lactating Holstein cows were used in a replicated 4×4 Latin square design(21-day period).Cows were fed a basal diet without addition(CON)or basal diet with added CFE at 50(CFE50),100(CFE10),and 150 g/d(CFE150).Feeding CFE up to 150 g/d increased milk yield and milk lactose percentage.Supplementary CFE linearly decreased milk somatic cell count.Serum cytokines interleukin-1β(IL-1β),IL-2,IL-6,and tumor necrosis factor-α(TNF-α)concentrations decreased linearly as the levels of CFE increased.Cows in CFE150 had lower serum lipopolysaccharide and lipopolysaccharide binding protein compared with CON.These results indicate feeding CFE decreased systemic inflammation and endotoxin levels in dairy cows.Furthermore,feeding CFE linearly increased the concentrations of total volatile fatty acids,acetate,and butyrate in feces.The relative abundances of beneficial bacteria Bifidobacterium spp.,Clostridium coccoides-Eubacterium rectale group,and Faecalibacterium prausnitzii in feces increased linearly with increasing CFE supplementation.The diversity and community structure of fecal microbiota were un-affected by CFE supplementation.However,supplementing CFE reduced the relative abundances of genera Ruminococcus_torques_group,Roseburia,and Lachnospira,but increased genera Bacteroides and Phascolarctobacterium.Metabolomics analysis showed that supplementary CFE resulted in a significant modification in the fecal metabolites profile.Compared with CON,fecal naringenin,hesperetin,hippuric acid,and sphingosine concentrations were greater in CFE150 cows,while fecal GlcCer(d18:1/20:0),Cer(d18:0/24:0),Cer(d18:0/22:0),sphinganine,and deoxycholic acid concentrations were less in CFE150 cows.Predicted pathway analysis suggested that"sphingolipid metabolism"was signif

关键词： Citrus flavonoid Dairy cow Fecal microbiota Systemic inflammation Volatile fatty acid

Absence of hexavalent chromium in marine carbonates:implications for chromium isotopes as paleoenvironment proxy

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National Science Review 2021年第3期8卷 151-158页

作者： Ziyao Fang Liping Qin Wei liu Tao Yao Xiaoyan Chen shiqiang Wei CAS Key Laboratory of Crust-Mantle Materials and Environments University of Science and Technology of China CAS Center for Excellence in Comparative Planetology National Synchrotron Radiation Laboratory University of Science and Technology of China

The oxygenation of Earth’s atmosphere is widely regarded to have played an important role in early-life evolution.Chromium(Cr) isotopes recorded in sedimentary rocks have been used to constrain the atmospheric oxygen level(AOL) over geological times based on the fact that a positive Cr isotopic signature is linked to the presence of Cr(Ⅵ) as a result of oxidative continental weathering.However,there is no direct evidence of the presence of Cr(Ⅵ) in sedimentary rocks yet.Carbonates are most widely distributed over geological times and were thought to have incorporated Cr(Ⅵ) directly from seawater.Here,we present results of Cr valence states in carbonates which show Cr(Ⅲ) is the dominant species in all samples spanning a wide range of geological times.These findings indicate that Cr(Ⅵ) in seawater was reduced either before or after carbonate precipitation,which might have caused Cr isotopic fractionation between seawater and carbonates,or marine carbonates preferentially uptake Cr(Ⅲ) from seawater.As Cr(Ⅲ) can come from non-redox Cr cycling,which also can cause isotopic fractionation,we suggest that positively fractionated Cr isotopic values do not necessarily correspond to the rise in AOL.

关键词： Cr isotopes XANES speciation atmospheric oxygen level

Constructing zwitterionic nanofiber film for anti-adhesion of marine corrosive microorganisms

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Journal of Materials Science & Technology 2021年第11期70卷 145-155页

作者： Jiashun Shi Suchun Wang Xin Cheng shiqiang Chen Guangzhou liu Institute of Marine Science and Technology Shandong UniversityQingdao266237China

A zwitterionic nanofiber film was constructed through combining zwitterionic polymer with anodic aluminum oxide template for anti-adhering typical marine corrosive microorganisms,i.e.Pseudomonas aeruginosa,Desulfovibrio vulgaris and Chaetoceros muelleri.Results showed that the fabricated zwitterionic polymers film has fibrous nanostructure with uniform distribution and super hydrophilia.This film has wide anti-adhering properties,and it can effectively reduce the attachment of these three microorganisms by more than 99%.Moreover,the adhesion of extracellular polymeric substances secreted from these three microorganisms are also inhibited,which is one reason for the fabricated nanofiber film with antiadhesion characteristic of microorganisms.This research provides valuable information for solving the problem of microbial adhesion on metal surfaces in the marine environment.

关键词： Zwitterionic nanofiber film Confocal laser scanning microscope Fourier transform infrared spectrometer Extracellular polymeric substances Microbiologically influenced corrosion

论构建利益共生、权利共享、责任共担的人类命运共同体

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中州学刊 2023年第11期 5-11页

作者：刘世强西南财经大学马克思主义学院四川成都611130

人类命运共同体是21世纪人类社会发展与交往的历史主题,是新时代中国特色大国外交的行动指南。立足历史唯物主义的理论视野,资本主义世界体系在推动生产力发展和促进普遍交往的同时也带来了分配不公、权利失衡和责任赤字等世界之乱,推... 详细信息

人类命运共同体是21世纪人类社会发展与交往的历史主题,是新时代中国特色大国外交的行动指南。立足历史唯物主义的理论视野,资本主义世界体系在推动生产力发展和促进普遍交往的同时也带来了分配不公、权利失衡和责任赤字等世界之乱,推动了人类命运共同体的历史性出场。构建人类命运共同体正是“世界向何处去”的中国方案,是国际社会实现共商共建共享的正确选择。以全面超越资本主义世界体系为理论旨趣,人类命运共同体内蕴着构建利益共生、权利共享、责任共担的新型世界秩序的内在要求。在行动路径上,构建人类命运共同体需要以合作共赢为导向建设利益共生的世界,以主权平等为原则建设权利共享的世界,以集体行动为关键建设责任共担的世界。

关键词：人类命运共同体利益共生权利共享责任共担

全球安全倡议的时代价值、内在逻辑与实践路径

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当代世界 2024年第1期 35-40页

作者：刘世强西南财经大学马克思主义学院

全球安全倡议是中国对“世界需要什么样的安全理念、各国怎样实现共同安全”这一时代之问的科学回答,为实现人类持久和平锚定历史方位,为完善全球安全治理提供明确思路,为重塑全球安全理念指明正确方向。全球安全倡议以合作共赢为理念指... 详细信息

全球安全倡议是中国对“世界需要什么样的安全理念、各国怎样实现共同安全”这一时代之问的科学回答,为实现人类持久和平锚定历史方位,为完善全球安全治理提供明确思路,为重塑全球安全理念指明正确方向。全球安全倡议以合作共赢为理念指引,以主权平等和多边主义为基本原则,以统筹维护综合安全为主要内容,以和平对话与平等协商为方法路径,以构建人类安全共同体为目标愿景。长期以来,中国坚持以知促行,着力夯实全球安全根基,主动化解安全争端,积极承担安全责任,不断完善安全治理,为维护世界和平、守护全球安全作出重大贡献。

关键词：全球安全倡议安全治理人类命运共同体人类安全共同体

Minimizing makespan of a production batch within concurrent systems:Seru production perspective

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Journal of Management Science and Engineering 2022年第1期7卷 1-18页

作者： Yin Gai Yong Yin Jiafu Tang Shiqiang Liu College of Management Science and Engineering Dongbei University of Finance and EconomicsDalian116025China Graduate School of Business Doshisha UniversityKyoto602-8580Japan School of Economics and Management Fuzhou UniversityFuzhou350108China

This paper discusses the makespan minimization of a production batch within a specific concurrent system,seru production system.A seru production system consists of multiple independent serus.A seru is a compact assembly origination in which products are assembled from-the-beginning-to-the-end without disruptions.One capability of a seru production system is its responsiveness.A performance measure used to evaluate a seru system’s responsiveness is the makespan of production batches assembled within the seru system.This study addresses the makespan minimization problem through an optimal seru loading policy.The problem is formulated as a min-max integer optimization model.An exact dimension-reduction Algorithm is developed to obtain the optimal allocation that minimizes the makespan.We show that the solution space increases very quickly.In contrast,our algorithm is efficient with a polynomial computational complexity of,where is the total number of serus in a seru system.To verify the usefulness of the developed exact dimension-reduction algorithm,we compare it with a widely practiced greedy algorithm through experiments.We find that our optimal algorithm is robust in most cases and the greedy algorithm is efficient when variability in production efficiencies is high.This result can guide us to adopt different algorithms in different business environments.If the variability in production efficiencies is high,e.g.,new employees and/or new products assembly,the greedy algorithm is efficient.For other cases,our optimal algorithm should be adopted to obtain the minimum makespan.We also extend the method to the application of a rotating seru.

关键词： Assembly Greedy algorithm Dimension reduction Exact algorithm Variability Polynomial computational complexity