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Controllable Morphology Tailoring with Solvothermal Method Toward LiMnPO_(4)/C Cathode Materials for Improved Performance and Favorable Thermostability

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 790-800页

作者： Wei Yang Xiulian Qiu Chengyun Wang Jinhao Ye Jihua Zhu Hanbo Zou Shengzhou Chen School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou510006China gac automotive research and development center Guangzhou511434China Sunwoda Electronics Co. LtdShenzhen518107China

An environmentally friendly method for the synthesis of LiMnPO_(4)/C anode material for lithium-ion batteries by solvothermal method is *** modification of the morphology of this precursor is altered by changing the ratio of the conditioning solvent(water-ethylene glycol solution)and the order of material *** glycol(EG)exerts a considerable influence on synthesizing LiMnPO_(4)/C flake-like nanocrystal,which benefits the extraction/insertion reaction of lithium ions and improves the electrochemical activity and electrochemical performance of LiMnPO_(4)/C *** the solvent composition is H_(2)O:EG=1:3,exhibiting exceptional charge/discharge performance and rate capability,the specific discharge capacities are 155.8,153.7,148.8,141.4,129.5,and 112.6 mAh g^(−1) at the 0.1,0.2,0.5,1,2,and 5 C rates,*** the charge-discharge rate returns to 0.1 C,the LiMnPO_(4)/C material shows a reversible discharge specific capacity of 153.7 mAh g^(−1).Differential scanning calorimetry(DSC)tests verify that the thermodynamic stability of the prepared LiMnPO_(4)/C(LMP)and commercial LiFePO_(4)(LFP)materials is better than that of commercial nickel-cobalt-aluminum(NCA)ternary *** prepared LiMnPO_(4)/C composites have high electrochemical capacity and cycle stability.

关键词： LiMnPO_(4)/C solvothermal method Ethylene glycol Lithium-ion diffusion Thermostability

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Anhydride type film-forming electrolyte additives for high-temperature LiNi0.6Co0.2Mn0.2O2//graphite pouch cells

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Progress in Natural Science:Materials International 2023年第3期33卷 320-327页

作者： Anwei Zhang Chengyun Wang Weizhen Fan Jingwei Zhao Yanping Huo Xijun Xu gac automotive research &development center Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Materials Science and Engineering South China University of Technology research and development center Guangzhou Tinci Materials Technology Co. Ltd. College of Chemical Engineering and Light Industry Guangdong University of Technology

LiNi0.6Co0.2Mn0.2O2//graphite full cell, due to its high energy density as the most promising candidate for power batteries received increased attention, but the severe capacity loss under high-temperature conditions prevents their large-scale application. Here, glutaric anhydride(GA) and succinic anhydride(SA) as electrolyte additives are investigated to overcome the high-temperature problem of LiNi0.6Co0.2Mn0.2O2//graphite cells. Due to the unique film-forming features and high-temperature stability, the cells containing 0.5% GA and 0.5% SA can retain capacity retention of 91.2% and 92.4% stored at 60°C for 15 days, corresponding to a negligible capacity loss of 4.6 and 0.8 m Ah g-1after 200 cycles, respectively. In addition, the lifespans of cells under 25°C are also significantly extended by introducing GA and SA into the electrolytes. Electrochemical and spectroscopic techniques results indicate the full cell capacity loss is predominantly caused by the unstable anode solid electrolyte interphase(SEI) layer and a stable SEI film derived from GA and SA is formed on the graphite electrode *** SEI film can effectively inhibit the consumption of electrolytes and enhance the high-temperature performance of cells. This work paves a way for moderating high energy density cells’ work under high-temperature operation by developing special anodic film-forming electrolyte additives.

关键词： Anhydride-based Electrolyte additives Film-forming LiNi0.6Co0.2Mn0.2O2//graphite High-temperature performance

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research and Application of Vehicle R&D Test Management Digital Transformation

Research and Application of Vehicle R&D Test Management Digi...

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2022中国汽车工程学会年会暨展览会

作者： Li Tao Lu Haibo Chen Long gac automotive research & development center

Combined with the current wave of digital transformation,based on the test overall management platform construction project of gac automotive Engineering Institute,this paper summarizes how to build an integrated test business virtual space connecting multiple participants based on information technology,achieve the digital transformation of test organization,test resource allocation,test execution and test delivery,and form a complete set of test business data collection、transmission、analysis and decision-making system,and then optimize the allocation of test resources to reduce redundancy,reduce cost and increase efficiency.

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research and Experimental Verification on Modification Technology of Helical Gear Transmission

Research and Experimental Verification on Modification Techn...

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2021中国汽车工程学会年会暨展览会

作者： Zhang Chen Zhou You Ling Xiaoming Zou Jiayuan Huang Bo Xiong Wei gac automotive research ＆ development center

In order to improve the NVH performance of transmission system,the micro parameter modification method is used to optimize the contact characteristics of helical gear ***,the finite element model of transmission structure is established by using’Romax’ software,and the boundary conditions of optimization and modification are determined through the combination of simulation and *** the transmission error of helical gear pair under the condition of multi input torque as the design objective,and taking the contact stress of helical gear pair as the auxiliary objective,the optimization modification of helical gear is ***,the optimal modification parameters are verified by finite element analysis and *** results show that the gear modification optimization design method combining the finite element model and the test can improve the meshing state of the helical gear pair under all input torque *** the condition of small torque,the meshing state is better,and there is no significant change after optimization ***,with the increase of the input torque,the meshing state of the modified gear pair is significantly *** with the gear with the initial design parameters,the transmission error of the gear with the optimal modification parameters under the maximum torque condition is reduced by 40%,and the noise can be optimized by 7 dB at most.

关键词： modification parameters of helical gears transmission error contact stress optimal design finite element model

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Experimental Study on Ethanol Gasoline Flash-boiling Spray Characteristics Using Multi-Hole GDI Injector

Experimental Study on Ethanol Gasoline Flash-boiling Spray C...

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2019中国汽车工程学会年会

作者： Du Jiakun Chen Hong Li Yuhuai Ye Lin Li Genkun gac automotive research ＆ development center

The effects of ethanol/gasoline blended fuel composed of gasoline with ethanol as additives in volume basis,on spray characteristics were experimentally *** were carried out under various ambient pressure and fuel *** results show that the spray would convert to superheated states by reducing the ambient pressure or increasing the fuel *** influence of ambient pressure and fuel temperature on the macroscopicspray patterns become more significant with higher ethanol fraction *** the end of the injection,the E85 spray penetration under the cold-jet condition is about 11% shorter than that with gasoline,and the E85 spray penetration under flash-boiling condition is about 20% longer than that with *** spray penetration rate increases and the total penetration extends obviously with higher injection *** the flash-boiling conditions,the spatial structure close to the injector tip presents a hollow cone structure,but the spatial structure far from the tip is obviously different for various fuels due to the different degree of flash-boiling collapse.

关键词： constant volume vessel gasoline direct injection injector flash boiling spray spatial structure ethanol gasoline

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Structure Analysis With 2D Quadrilateral Meshes Generated by a Label-Driven Subdivision

Structure Analysis With 2D Quadrilateral Meshes Generated by...

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2020中国汽车工程学会年会暨展览会

作者： Liu Bo Liu Xuewu Ling Xiaoming Zhang Xingui Wang Zelun Liu Wei gac automotive research ＆ development center

For a structural analysis using the finite element method,a hexahedral element is preferable to a tetrahedral element from the viewpoint of ***,it is very difficult to subdivide a mesh consisting of hexahedral elements if the shape of the mesh is ***,in this paper,as a preliminary research,we use a label-driven subdivision method for a two-dimensional mesh,and show that meshes subdivided nonuniformly can guarantee as much accuracy as meshes with uniform subdivision.

关键词： structure analysis hexahedral element label-driven subdivision

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Structure Analysis With 3D Hexahedral Meshes Generated by a Label-Driven Subdivision

Structure Analysis With 3D Hexahedral Meshes Generated by a ...

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2020中国汽车工程学会年会暨展览会

作者： Liu Bo Liu Xuewu Ling Xiaoming Zhang Xingui Wang Zelun Liu Wei gac automotive research ＆ development center

For structure analysis with the finite element method（FEM）,the hexahedral element is preferable to the tetrahedral one from the viewpoint of ***,we had introduced a label-driven subdivision method for a two-dimensional mesh and showed that the meshes generated by our method were useful for structural *** this study,we extend our two-dimensional algorithm to three-dimensions and verify that the meshes generated by the proposed mesh-subdivision algorithm are useful for structural analyses.

关键词： structure analysis hexahedral element label-driven subdivision

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research on Tortional Vibration Characteristics of Series Spring Damper for Hybrid Electric Vehicle

Research on Tortional Vibration Characteristics of Series Sp...

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2023中国汽车工程学会年会暨展览会

作者： Liu Peng Chen Zhiyuan Yang Qi Chen Hanshuang Tian Zilong Ren Chao gac automotive research & development center

In this paper,the torsional vibration characteristics of series spring torsional damper for hybrid electric vehicle are ***,dynamic sofeware is used to build the physical simulation model of the hybrid transmission system under the direct drive acceleration condition,and the modal analysis of the transmission system is carried out,and the local mode of the series spring torsional damper is *** the torsional vibration analysis and real vehicle test of the hybrid power train,the influence of the local mode of the series spring torsional damper on the torsional vibration of the power train is confirmed,local modes can amplify the torsional vibration response of the drive train and cause the gear rattle ***,the sensitivity analysis is carried out to find out the key influencing ***,the improved torsional damper is simulated to confirm the improvement *** conclusion provides a reference for the optimization of the series spring torsional damper.

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research on the Influencing Factors of Axial Preload Performance of Aluminum Alloy Thread

Research on the Influencing Factors of Axial Preload Perform...

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2020中国汽车工程学会年会暨展览会

作者： Wang Xiaobin Huang Xiucheng Zhang Anwei Liu Yanbin He Guoxin Yan Xing gac automotive research ＆ development center

The model of thread connection preload is set up and the main factors affecting the performance of thread axial preload are analyzed *** on the steel-aluminum connection structure,the test was carried out on the meshing length of aluminum thread,the friction of aluminum support surface,the friction of aluminum thread and the rotation speed by using the tightening system and ultrasonic preload measuring *** results show that the stability of axial preload increases with the increase of the meshing length of aluminum *** the plain washer to effectively improve the friction state of the supporting surface,axial preload increased by nearly 40%;The friction state of thread was effectively improved by adding wire thread sleeve,and the axial preload was increased by nearly 46%.It is suggested that the proper increase of rotation speed is of certain significance to ensure the reliability of threaded connections.

关键词： aluminum alloy screw thread performance axial preloaded

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Optimization Analysis of Buckling Strength of Connecting Rod for Internal Combustion Engine

Optimization Analysis of Buckling Strength of Connecting Rod...

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2019中国汽车工程学会年会

作者： Xu Kunpeng Wu Guangquan Xu Lin gac automotive research ＆ development center

Buckling strength is one important indicator of connecting rod *** the increasing of power density of internal combustion engine,the compressive load of connecting rod becomes larger and larger,and bending fracture becomes one of the failure forms under unusual *** this paper,combined with a case of bending fracture of the connecting rod in the development process of a new engine,a design method to ensure the safety of connecting rod is summarized as followed:according to the ultimate stress method,the stress at the middle section of the connecting rod is calculated,the additional stress caused by longitudinal bending is required to be between 10% and 15% of the normal stress,and the structural safety factor is evaluated based on *** the buckling test is carried out to obtain the actual buckling load and consequently the experimental safetyfactor of the connecting rod is *** this method,the buckling strength of many connecting rods of several engines are tested and analyzed *** it is concluded that the experimental safetyfactor of the buckling strength should be greater than 1.5,which provides an optimization method for the design and development of the connecting rod.

关键词： internal combustion engine connecting rod buckling strength safety factor

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