Abstract:During the driving process of new energy vehicles,the battery pack located at the bottom of the vehicle chassis is easily scratched by ground protrusions,causing safety accidents.Currently,there is a lack of awareness in the industry about the failure of battery pack bottom scraping.Therefore,this article will analyze typical failure cases in the scraping condition,obtain the structural design principles of battery pack bottom protection,and propose targeted improvement designs based on finite element simulation methods,providing guidance and reference for battery pack bottom protection design,thereby improving the overall safety of the battery pack.

Abstract:The new energy battery industry,as a key area in the global energy transition,urgently requires interdisciplinary talent with expertise in materials science,electrochemistry,and engineering technology.Currently,university curricula lag behind the pace of technological iteration,and issues encountered on corporate production lines cannot be promptly transformed into teaching cases.Additionally,cutting-edge research outcomes from university-industry joint laboratories struggle to be swiftly integrated into talent cultivation systems.These issues result in significantly increased retraining costs for graduates upon entering the workforce,thereby constraining improvements in corporate R&D and production efficiency.Therefore,this paper takes the new energy battery industry academy as a platform to systematically study how the"university-industry-research"tripartite can achieve complementary advantages through institutional innovation,with the aim of establishing a scalable collaborative talent cultivation model to support the sustainable development of the industry.

Abstract:The assembly of coin cell is relatively convenient and easy,and can provide repeatable experimental data,has become the preferred testing method for the performance of battery materials in laboratories.However,the coin cell system uses lithium metal to provide excess lithium source for the electrode,which can mask the side reaction issues in the cell,and it is difficult to accurately evaluate the interaction between the positive and negative electrode materials under actual matching conditions,and also cannot accurately predict their performance in the actual lithium ion full cell.In order to accurately predict the performance of battery materials,the research and development of accurate and highly reproducible preparation methods for full coin cell has certain value.This article mainly uses self-made silicon-based negative electrode materials and commercial positive electrode materials,separators,and electrolytes to study the preparation method of full coin cell,analyzes and summarizes the research results.

Abstract:To improve the electrochemical performance of alkaline zinc-manganese batteries,this paper introduced potassium persulfate as a cathode additive for the first time.Experimental results demonstrated that the open-circuit voltage of LR6 batteries significantly increased from 1.651 V(without additive)to 1.675 V when the potassium persulfate was added at a concentration of 0.5%by mass of the manganese dioxide cathode.Additionally,the discharge time at a continuous resistance of 3.9 Ω until the voltage dropped to 0.9 V extended from 404.7 min(without additive)to 414.0 min.Meanwhile,the discharge performance under various loads and discharge modes,including 250 mA/1 000 mA,3.9 Ω/43 Ω and 1.5 W/0.65 W conditions,also showed significant improvement.After storage at room temperature(25℃)and high temperature(60℃),LR6 batteries maintained relatively high levels of open-circuit voltage and discharge performance,demonstrating excellent storage characteristics.These research findings provided new insights into enhancing the performance of alkaline zinc-manganese batteries,thereby contributing to the rapid development of battery technology and improving their economic benefits.

Abstract:Under the background of the rapid development of new energy industry,the accelerated iteration of battery technology puts forward higher requirements for the training of professionals.Industrial college provides an important platform for the construction of battery teachers.However,the"double-qualified"teachers generally have problems such as lack of industrial practical experience and slow technology update,which leads to the disconnection between talent training and industry demand.This paper discusses how to build a"double-qualified"teacher team of battery specialty under the background of industrial college,in order to open up the channel of teachers'ability improvement and industrial technology development,and provide support for cultivating high-quality battery technology talents.

Abstract:The interfacial oxide layer and polycrystalline Si-based layer of the TOPCon solar cell were fabricated by the method of LPCVD(low-pressure chemical vapor deposition)equipment.The relevant process of the related oxide layer,polycrystalline silicon layer,and phosphorus diffusion doping is studied.The uniformity of Poly-Si thickness at different positions throughout the quartz boat has been greatly improved through the dual process gas entry method at the furnace mouth position and the furnace center position.The experimental results indicate that a smaller backfill oxygen flow rate of 8 L/min during the preparation of the tunneling oxide layer during the process can more evenly distribute the oxygen atmosphere throughout the entire tube furnace,which improves the tunneling oxide layer at the tail of the tube furnace and enhanced its Lifetime performance.The Raman spectra of polycrystalline silicon grown at lower temperatures and higher pressures indicate a relatively low degree of crystallization.Under the conditions of 580℃,610℃,and 630℃,the higher the temperature,the higher the degree of crystallization and the faster the growth of polycrystalline silicon.However,the degree of crystallization of polycrystalline silicon grown under various conditions is consistent after phosphorus diffusion.In addition,the results show that adjusting the thickness of the tunneling oxide layer to allow the amount of phosphorus atoms through the oxide tunneling layer can improve the passivation effect.The thicker the polycrystalline silicon,the lower the surface concentration of phosphorus doping under the same conditions,and the higher the surface concentration of polycrystalline silicon layers with the same thickness at higher phosphorus diffusion annealing temperatures.

Abstract:This article systematically analyzes the current situation and trends of patent litigation in the lithium ion battery industry,and analyzes the characteristics of patent applications,types of patents involved in the litigation,technical fields to which the litigation patents belong,and stability of the litigation patents of CATL.Research shows that CATL's patent application volume is rapidly increasing,with technology themes focused on battery cell structures,modules,and battery packs.The proportion of material patents is low,mainly due to technical barriers and trade secret protection;Among the patents involved in the lawsuit,71%are utility models,mostly involving improvements in battery cell structures,and were applied for around 2016;Through stability analysis of 21 involved patents,it was found that the invalidation rate of structural patents reached 85%,mainly due to insufficient creativity;However,material patents have significantly higher stability due to differences in parameterized claim design and examination between China and the United States.By analyzing the characteristics of such involved patents,readers can understand the offensive and defensive strategies of CATL's patent layout,how to create patent weapons and the value of patent weapons in commercial competition,the issues that need to be paid attention to when applying for and examining material and process patents,and the differences in the determination of patent application invalidity reasons between China and the United States.This study aims to provide some reference significance for the future patent layout,patent risk warning,patent examination,etc.of the lithium ion battery industry.

Abstract:This study prepared three novel aluminum alloy anode materials,Al-Mg-Ga-Hg-Sn,with different Hg contents(mass fractions of 0.03%,0.04%,0.05%)using the melting-casting method.The electrochemical properties and hydrogen evolution corrosion rate in alkaline solution were investigated.The results indicate that adding an appropriate amount of Hg to the aluminum alloy is beneficial for enhancing its performance under high-power discharge conditions.Appropriately increasing the content of Hg to 0.04%can effectively reduce the corrosion rate of hydrogen evolution and improve the corrosion resistance of aluminum alloy.At the same time,the electrode potential of aluminum alloy has obvious negative shift,which can effectively inhibit the generation of passivation film.Discharge performance tests on assembled aluminum-silver oxide single cells demonstrated that the aluminum alloy with the composition Al-0.3Mg-0.02Ga-0.04Hg-0.05Sn exhibits excellent performance,with an average voltage of 1.666 V up to a cutoff voltage of 1.48 V.This alloy shows promising potential for application in next-generation high-specific-energy Al/AgO batteries.

Abstract:A convex characteristic region occurs in the hybrid pulse power characteristic(HPPC)curve of lithium ferromanganese phosphate(LMFP)and NCM blending system,and the state of charge(SOC)interval corresponding to the characteristic region becomes wider after the charge-discharge cycle of the cell.The application of the distribution of relaxation times(DRT)method for analyzing electrochemical impedance spectroscopy(EIS),combined with the test results of the lithium ion diffusion coefficient,indicates that the characteristic regions are caused by the discharge characteristics of LMFP.After cycling,the Mn mass fraction of cathode decreases,and when the blending system is discharged from 90%SOC to 50%SOC,the diffusion polarization(Rw)and positive charge transfer impedance(Rct)gradually increase,resulting in the widening of SOC interval corresponding to the characteristic region.

Abstract:Solid polymer electrolytes(SPE)are regarded as the core materials for the next-generation high-energy-density lithium batteries due to their excellent mechanical properties,good interfacial compatibility and high safety.However,their wide application is limited by problems such as low ionic conductivity,poor interfacial compatibility and insufficient electrochemical stability.This study proposes a controllable initiation system based on the two-component ionic liquid-lithium salt,achieving cationic ring-opening polymerization of 1,3-dioxopentane(DOL)monomers,and further introducing butanitrile(SN)to prepare high-performance polymerization of 1,3-dioxopentane(PDOL)-based electrolytes.The research found that SN effectively inhibited the crystallization of the matrix through the hydrogen bond interaction between the cyanide group and the PDOL chain,constructed a continuous amorphous ion channel,increased the room-temperature ionic conductivity of the PDOL-SN40 electrolyte to 1.1×10-3 S/cm,and the lithium ion migration number reached 0.83.Meanwhile,the introduction of SN broadens the electrochemical window of the electrolyte and significantly inhibits lithium dendrites and interfacial side reactions by in-situ forming a LiF-rich solid electrolyte interface(SEI)film.Electrochemical tests show that the lithium symmetrical battery assembled with PDOL-SN40 remains stable after 1 600 h,and the lithium metal deposition morphology is uniform.The capacity retention rate of the Li/LFP full battery reached 91.8%after 600 cycles at 0.5 C,and it still maintained a capacity output of 85.3%at a rate of 2 C.This research provides a new idea for the development of solid electrolytes with high ion conductivity,wide voltage window and interface stability,and promotes the practical application process of high-safety lithium metal batteries.

Abstract:The reactions inside lithium-ion batteries are mostly chemical processes with complex and variable characteristics,the safety issues are difficult to detect and unable to accurately analyze the specific reasons in a short period of time.In-situ non-destructive characterization methods can minimize external interference,detect batteries in real environments and operating conditions,more clearly and accurately express the safety failure behavior of batteries,accurately analyze the safety failure characteristics and reaction mechanisms such as lithium deposition and thermal runaway,and further guide the improvement of electrode material preparation and battery system structural design.Starting from the failure analysis of lithium-ion batteries,combined with in-situ non-destructive testing technology,this article elaborates on the principles,application methods,and applicable failure modes of testing technology.In addition,by comparing and analyzing various detection technologies,the urgent problems that need to be solved in various technologies have been summarized,providing ideas for the development of in-situ non-destructive testing technology in the future;analyzing the possibility of applying various technologies to battery systems,providing theoretical support for the construction of battery safety prevention and early warning mechanism.

Abstract:High power performance is regarded as a prominent competitive capability of lithium-ion batteries(LIBs),however,the emphasis has been placed on the morphology and structure of the anode/cathode materials,while neglecting the cooperative interaction in design and production of LIBs.In this paper accordingly,lithium iron phosphate(LFP)and graphite,which have relatively favorable power performance,both were selected,to sequentially investigate the compatibility of compacted density and particle size between cathode and anode materials.The results indicate that the smaller particle size scheme has the highest magnification cycle life,reaching up to 900 cycles.