Abstract:In nickel cobalt manganese oxide(NCM)cathode lithium-ion batteries,transition metal dissolution will cause cell aging.In this work,relaxation time distribution(DRT)analysis of AC impedance spectrum of three-electrode cells were performed by RelaxIS software and d V/d Q curves were combined to study the influence of Ni,Co and Mn transition metal ions on the battery cycle,and the causes of capacity degradation caused by the dissolution of transition metal ions were analyzed.After the dissolution of transition metal ions,they deposit on the surface of the anode,causing an overall increase in anode impedance,which affects the extraction and insertion of lithium ions,decreasas the uniform distribution of lithium on the anode surface,leads to the acceleration of anode side reactions and the consumption of active lithium.The order of influence is Mn>Co>Ni,with Mn ion having the greatest influence and Ni ion having the smallest influence.

Abstract:As compared to the ternary cathode materials of lithium ions batteries(LIBs),the advantages of relatively stable structure and low risk of safety accident endowed lithium iron phosphate(LiFePO4,abbreviated as LFP)a wide application in the field of LIBs.How to further develop the electrochemical performance of LFP has become a hot topic in the research field of LIBs.In the present work,a physical coating method was used to apply acetylene black on the surface of the commercial current collector of aluminum foil forming a novel kind of current collector.Subsequently,the as-prepared current collector was used to prepare LFP electrode generating an acetylene black membrane coated Al foil supported LFP electrode.It was revealed that the initial discharge capacity of the newly prepared LFP was as high as 217 mAh/g,significantly higher than that of the conventional LFP electrode(165 mAh/g).The discharge capacity of the new LFP electrode at 10 C after 100 cycles was 76 mAh/g,showing an increase of about 30%compared to that of the conventional LFP electrode(58 mAh/g).At 20 C after 500 cycles,the discharge capacity of the new LFP electrode was still as high as 38 mAh/g,presenting an increase of about 40%compared to that of the conventional LFP electrode(27 mAh/g).In this work,the techniques of galvanostatic charge-discharge(GCD),cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)were all employed to systematically study the electrochemical performance of the studied electrodes.And,XRD(X-ray diffraction),SEM(scanning electron microscopy)and FTIR(Fourier transform infrared spectroscopy)were used to characterize the studied samples before and after the high rate long-term experiments.The greatly reduced charge transfer resistance of LFP electrode as well as the evidently inhibited corrosion process of Al foil was analyzed to be the main contributions of the newly formed acetylene black membrane providing LFP a satisfactory high rate performance.The feature of easy large-scale commercial production made the present work very meaningful to the further development of the LFP-based LIBs.

Abstract:As key materials for all-solid-state batteries,polymer solid-state electrolytes have become a research hotspot due to their high safety and excellent processing properties.Based on invention patent application data from the past two decades,this paper analyzes the development trends of patent,providing references for the development of research strategies,patent portfolio planning,and technology commercialization in related areas.

Abstract:The safety issue of lithium batteries has become a key factor restricting development.Adding flame retardants to the electrolyte can improve the safety of lithium ion batteries.This research focuses on three flame retardant additives:Ethoxy(pentafluoro)cyclotriphosphazene(PFPN),Tris(2-carboxyethyl)phosphine(TCEP),and Tri(1,3-dichloroisopropyl)phosphate(TDCPP),and experimental comparative studies were conducted to investigate their effects on the safety and electrochemical performance of the electrolyte.Firstly,the flame retardant performance of TCEP,TDCPP,and PFPN at room temperature was explored through self-extinguishing time and self-propagation rate tests.Subsequently,electrochemical performance tests were performed.The results indicate that the electrolyte with only 5 wt%PFPN achieves a non-flammable,and the addition of PFPN can enhance the cycle performance of the lithium ion battery.When the addition amount of TCEP and TDCPP exceeds 20 wt%,the safety of the electrolyte is significantly improved,but the lithium ion battery can no longer function normally.Furthermore,in a long cycle test of 200 cycles,the lithium ion battery with 5 wt%PFPN addition demonstrated better cycle performance compared to the 10 wt%addition.

Abstract:In response to the demand for improving the heat dissipation capacity and power generation efficiency of proton exchange membrane fuel cell,the high operating temperature and the ultra-high power density fuel cell stack technology is the future development trend.It is of great research significance for studying the structural design and proton conduction mechanism of high-temperature ultra-thin proton exchange membrane and analyzing the fatigue/decay behavior of proton exchange membrane under high temperature conditions.In this paper,the technical requirements and the proton conduction mechanism of the high-temperature proton exchange membrane was surveyed,respectively.The classification of the high-temperature proton exchange membrane was summarized.And the development trend of the high-temperature proton exchange membranes was introduced.

Abstract:Against the backdrop of the accelerating global green transition,sustainable development has become the core competitiveness of the battery industry.It is not only a response to policy compliance but also a key prerequisite for securing future market competitiveness.Industrial digitalization,ecological greening,intelligent operation,resource recycling,and business globalization are becoming the strategic pathways for China's lithium battery industry to maintain its leading position globally.To meet requirements of the EU Battery and Waste Battery Regulation and customer requirements,environmental,social,and corporate governance(ESG)management has become a key task for battery enterprises.As global demands for sustainable development and supply chain transparency continue to rise,the battery passport has become a crucial tool for the lithium battery industry to enhance its international competitiveness.By digitally recording key data throughout the battery's life cycle,it promotes the industry's development towards greater transparency and sustainability.

Abstract:Sodium-ion batteries represent a promising new electrochemical energy storage technology with broad application prospects.This paper focuses on the application of petroleum asphalt-based hard carbon in sodium-ion batteries anode.Firstly,it introduces the background of this material's growing attention due to its wide availability and low cost,followed by a statistical analysis of research trends from 2010 to 2024 through examining the number of academic papers and patent applications.The paper then elaborates on mainstream technical approaches including process flow,raw material pretreatment,carbonization reaction,and improvement methods.However,challenges remain in raw materials sourcing,carbonization processes,structural-property balance,and large-scale production.Currently,the research primarily concentrates on precursors,asphalt conversion,and carbonization techniques.Continuous advancements in preparation processes and deeper understanding of material structure-property relationships are driving progress.Petroleum asphalt-based hard carbon anode materials is expected to achieve industrial application in sodium-ion batteries and broader energy storage field.

Abstract:With the deepening of energy structure transformation,the demand for battery testing and maintenance technology talents in the new energy vehicle industry has shown explosive growth.As the main body of cultivating technical and skilled talents,the construction of the"dual teacher"teaching team in vocational colleges is directly related to the quality and efficiency of industry education integration.This article focuses on the field of battery testing and maintenance,systematically analyzing the core role and practical difficulties of"dual teacher"teachers in the process of education,exploring feasible paths for their ability improvement and mechanism optimization,and aiming to build a talent training system that conforms to the laws of industrial technology iteration.

Abstract:High-entropy cathode materials for secondary batteries have rich composition space and entropy-driven stability,expanding the selection of cathode materials for secondary batteries.This paper takes the patent literature of high-entropy cathode materials for secondary batteries in the HimmPat patent database as a sample.Firstly,quantitative analysis methods are used to comprehensively sort out the global patent application trends,patent regional distributions,important applicants,related types of secondary batteries and cathode materials in this field.Secondly,qualitative analysis methods are used to focus on analyzing the development history,bulk modification and high-entropy coating layers in this field.The analysis indicates that the design rules,synergistic effects,and side effects of high entropy doping elements need to be further studied,and the comprehensiveness of patent layout in this field needs to be improved.

Abstract:Through the analysis of the system architecture,task allocation and scheduling,path planning and obstacle avoidance,perception and positioning,communication and coordination control,as well as calibration and calibration mechanisms involved in multi robot collaboration technology,combined with the characteristics of zinc iron liquid flow battery stack production process,this paper explores the application methods of multi robot collaboration technology in battery stack production.Through the analysis of specific enterprise application case results,it shows that multi robot collaboration technology has important application value in zinc iron liquid flow battery stack production.The introduction of multi robot collaboration technology has significantly shortened production cycle,reduced manufacturing costs,and improved the accuracy,quality,and consistency of stack assembly,and it enhances the performance and reliability of batteries.This technological advancement is accelerating the industrialization of battery energy storage solutions,positioning it to play a pivotal role in the global energy transition.

Abstract:Universities have strong basic research capabilities and talent reserves,while battery companies grasp market demand,engineering and mass production experience.By establishing joint laboratories,these two entities forms a crucial bridge for translating scientific achievements from the laboratory to the market.However,the existing joint laboratories are facing the challenge of transforming technical concepts into industrial applications in practice,and there is an urgent need to explore clearer and more efficient paths.Therefore,this article will explore the unique scientific research achievement transformation path of the university battery enterprise joint laboratory,in order to provide practical reference for improving the transformation efficiency of such platforms and help accelerate the industrialization process of key battery technologies.

Abstract:This study proposes an in-situ lithium plating detection method based on frequency sweep and single frequency impedance testing,applied to lithium iron phosphate cylindrical and prismatic aluminum shell cells.By monitoring impedance changes during the charging process,real-time detection of lithium plating is achieved.The experimental results show that both frequency sweep and single frequency methods can identify the onset of lithium plating,with consistent results between the two.Additionally,the reliability of single frequency testing under different charge rates has been validated about LFP cylindrical cell,showing that lithium plating occurs earlier as the charge rate increases under low-temperature conditions at 5℃.Meanwhile,the reliability of lithium plating detection for LFP prismatic aluminum-shell cells was also validated under 25℃and 2.5 C charging conditions using sweep frequency and single frequency tests.The above lithium plating detection methods provide an effective tool for the safety monitoring of lithium-ion batteries and offers experimental insights for battery design and optimization.

Abstract:Using lithium iron phosphate material as the positive electrode,artificial graphite material as the negative electrode to prepare a 10 Ah soft pack lithium-ion battery.In the battery design process,the method of excess positive electrode capacity is used,different SOC charges are carried out on the battery,and then the battery discharge and battery disassembly are carried out respectively.Analyzed the discharge curve and the lithium analysis of the negative electrode of the battery is observed.The results show that this method can accurately calculate the capacity of the negative electrode material in the lithium-ion battery.

Abstract:Sodium-ion batteries(SIBs)are regarded as a promising choice for the large-scale energy storage applications due to their ample source,low cost,and high safety.However,the practical use of SIBs are limited,especially in some high-altitude and large temperature differences regions.In low-temperature(LT)environments,the electrochemical performance and safety are compromised owing to the diffusion and migration rates of sodium ions in SIBs significantly decrease.Therefore,enhancing the LT performance of SIBs is crucial,with the rational design and modification of anodes materials being particularly critical.This paper review recent research progress of anode materials in LT environments,analyzed the difficulties and challenges faced by anode materials at LT,and three modification methods are overviewed.By means of various strategies such as structural optimization,surface/interfacial modification and conductive network engineering,electrochemical performance of anode materials can be effectively enhanced at LT.Significant improvements are manifested in enhanced ionic diffusion kinetics,stabilized electrode-electrolyte interface and reinforced structural integrity.Finally,future research directions for future LT SIBs are proposed,which provides references for promoting the application of SIBs.

Abstract:As the world's largest production base and exporter of primary batteries,China holds a significant large market share and possesses strong competitiveness internationally.Strict control over the quality of primary batteries is crucial for ensuring product circulation and usage safety.Aqueous electrolyte primary batteries have the characteristics of convenient use,high safety,low cost,and environmental friendliness.Although the preparation technology and process are becoming increasingly mature,there are still some potential safety hazards during use.Based on this,this study,in accordance with the testing standards for the safety of primary batteries with aqueous electrolyte,elaborates on the test items,test methods,and requirements for test results stipulated in the standards,sorts out the safety performance test results of common aqueous electrolyte primary batteries,summarizes the hazards caused by unreasonable operations during use,and clarifies the precautions during use.It is expected to provide a reference for the detection and safe use of aqueous electrolyte primary batteries.

Abstract:Based on the comparative analysis of the safety parts of domestic lithium-ion electrochemical energy storage standards GB 40165-2021,GB 44240-2024 and GB/T 36276-2023,the safety test requirements and test methods of the three standards are summarized,and the inconsistent parts between the standards are analyzed and summarized.The differences of application scope,term definition,cell test,module test and sample test among standards are pointed out.The three standards all involve lithium-ion batteries in electrochemical energy storage,but the scope of application and focus are different,GB 40165-2021,GB 44240-2024 are more focused on the safety requirements of batteries and battery packs,and GB/T 36276-2023 is more focused on the technical requirements and test methods of lithium-ion batteries.GB 44240-2024 and GB/T 36276-2023 two standards,in terms of safety requirements,the standard content is more repeated,increasing the difficulty of product certification of enterprises.In summary,these three standards are important national standards in the field of electrochemical energy storage,which complement each other and jointly promote the safety and development of electrochemical energy storage technology.In particular,the introduction of GB 44240-2024 mandatory energy storage battery safety standards can effectively promote the healthy development of the energy storage industry.

Abstract:In recent years,with the rapid development of the new energy industry,lithium iron phosphate(LFP)batteries,a key component of this sector,have found widespread application in automotive power,energy storage systems,and consumer electronics(3C).With the increasing demands for battery cycle life and rate performance,the study of battery materials has become particularly crucial.Among anode materials,graphite stands out due to its excellent conductivity and lithium storage capacity,making it a focal point of research and application.Compared to natural graphite,artificial graphite typically demonstrates significant advantages in cycle performance,electrolyte compatibility,energy density,processability,and application areas.In this context,this paper primarily investigates the impact of primary and secondary particle artificial graphite on the performance of LFP batteries,specifically evaluated the differences in rate performance,direct current internal resistance,and cycle stability when used as anode materials in LFP pouch batteries.The research findings indicate that,compared to primary particles graphite,secondary particles graphite exhibited superior rate performance,lower direct current internal resistance,and higher cycle capacity retention in LFP batteries.Therefore,secondary particles graphite shows greater potential for application in terms of rate performance and cycle stability,particularly in scenarios requiring higher performance standards.

Abstract:The accelerated development of the global new energy industry puts forward higher requirements for the quality of talents in the field of battery manufacturing.The traditional education model lags behind in the updating of professional courses,the design of practical links,and the capacity building of teachers,which is difficult to meet the talent needs of the rapid iteration of intelligent manufacturing technology.Through the school-enterprise collaboration mechanism,the industrial college provides an effective path for the innovation of talent training mode.Therefore,this paper discusses the construction of a training model for battery professionals based on industrial colleges,in order to provide solutions for the industry to deliver high-quality technical talents suitable for the development of intelligent manufacturing.

Abstract:In order to reveal the effect of Boron doping on the morphology,structure,and electrochemical performance of O3 phase NaNi1/3Fe1/3Mn1/3O2 Na-ion battery cathodes,samples of Boron-doped NaNi1/3Fe1/3Mn1/3O2 materials with different doping amounts were prepared.The microstructure,structure,and electrical performance were tested by scanning electron microscope(SEM),X-ray diffraction(XRD),and galvanostatic charge/discharge method respectively.The result of SEM showed that the introduction of Boron plays a role in 2 500 mg/kg and 3 750 mg/kg Boron-doped samples were increased to 86.74%,87.1%and 82.81%,respectively,after 50 cycling at 0.5 C rate.However,doping levels of element Boron at 5 000 mg/kg or higher can lead to the increase of NiO impurities and the growing of grain boundaries and stress within primary particles,results in the cycling retention rate sharply decreasing to about 60%.

Abstract:Flow batteries are among the technologies with significant potential for large-scale energy storage,but their low energy density has hindered further development.The characteristics of redox active material largely determines the cost,energy density and battery performance of the flow battery.As the positive electrode active material,iodine has the advantages of high solubility and high energy density.This paper reviews the research progress of Li-I2 flow batteries,Zn-I2 flow batteries,polysulfide-I2 flow batteries,and Sn-I2 flow batteries,focusing on the electrolyte,diapHragm and electrode.Compared with the all-vanadium flow battery that is closest to commercialization,the advantages and disadvantages of iodine-based flow batteries are evaluated.On this basis,this paper discusses the key points of future research directions of iodine-based flow batteries,in order to provide new ideas for the further development of iodine-based flow batteries.