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Plane-controlled growth strategy improves electrochemical performance of cobalt-free LiNi0.9Mn0.1O2 cathode

Progress in Natural Science:Materials International 2024年第3期34卷 569-577页

作者： Hao Tong Xun Yuan Ningbo Qin Yaocong Han Yan Cheng Fangli Ji Ruirui Tuo Changlang Liang Yi Wang Qilin Tong Zhaozhe Yu Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology Guilin University of Electronic Technology Guangxi CNGR New Energy Science & Technology Co. LTD. Guangxi Institute of Science and Technology Development Co. LTD. School of Chemistry and Chemical Engineering Guangxi Minzu University

The ultra-high nickel-layered cathodes（Ni ≥ 90 %） has garnered significant attention due to its high specific capacity. However, the widespread application of ultra-high nickel-layered cathodes still suffers limitation by structural instability and poor rate performance. Herein, a crystal-face-induced strategy is proposed to enhance rate and cycling performances of the electrode by constructing rapid Li+diffusion channel and reducing internal grain boundaries of secondary particles. The crystal-face-induced strategy facilitates the growth of {010} lattice plane. Highly exposed {010} planes provide wide-open and unobstructed channels for Li+deintercalation/intercalation, enhances the electrode diffusion kinetics, and thus improves the electrode rate performance. In addition, this strategy promotes the primary particle growth, reduces the grain boundaries of secondary particles and mitigates the electrode/electrolyte interface side reactions, enhancing the structural stability and cycling life of the electrode. Accordingly, the modified sample achieved a reversible specific capacity of 198.3 mAh g-1at 1 C(1 C = 180 mA g-1) and maintained a capacity retention rate of 88.5 % after 100 cycles, higher than that of the original sample(73.6 %, 146 mAh g-1). At the high rate of 5 C, it can maintain a high specific capacity of 178mAh g-1（capacity retention rate of 99 %） after 150 cycles. This work is a leap in ultra-high nickel-layered cathodes development and provides insights into the design of electrode materials for other batteries.

关键词： Plane-controlled growth strategy Cobalt-free nickel-rich cathode Rate and cycling performances Lithium-ion battery

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A Leaf-Spring-Type Suspension Device for Compact Electromagnetic Vibrators 6

A Leaf-Spring-Type Suspension Device for Compact Electromagn...

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6th International Conference on Manipulation, automation, and Robotics at Small Scales, MARSS 2023

作者： Gao, Yu He, Wen Institute of Manufacturing Technology and Automation Zhejiang University State Key Laboratory of Fluid Power Components and Mechatronic Systems Zhejiang Province Key Laboratory of Advanced Manufacturing Technology Hangzhou310027 China

ISBN: (纸本)9798350330397

The suspension device is important in an electromagnetic vibrator to provide linear elastic support for the moving component. This paper describes the design and modeling of a leaf-spring-type suspension device which is suitable for a compact electromagnetic vibrator. The suspension device consists of multiple horizontal and lateral leaf springs. Theoretical analysis mainly focuses on the internal forces and deformations of the suspension device under load, which is verified by simulation. Besides, the influence of thicknesses of lateral and horizontal leaf springs on the stiffness linearity and the modals of the support device are analyzed through simulation. Simulation results indicate that the use of lateral leaf spring can improve the stiffness characteristic significantly. © 2023 IEEE.

关键词： Leaf springs

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Applications of sum-frequency generation vibrational spectroscopy in friction interface

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Friction 2022年第2期10卷 179-199页

作者： Zhifeng LIU Mengmeng LIU Caixia ZHANG Hongy an CHU Liran MA Qiang CHENG Hongyun CAI Junmin CHEN Institute of Advanced Manufacturing and Intelligent Technology Beijing Universityof Technology'Beijing 100124China State Key Laboratory of Tribology' Tsinghua University.Beijing 100084China Beijing Key Laboratory'of Advanced Manufacturing Technology'Beijing University'of Technology'Beijing 100124China

Sum-frequency generation(SFG)vibrational spectroscopy is a second-order nonlinear optical spectroscopy *** to its interfacial selectivity,SFG vibrational spectroscopy can provide interfacial molecular information,such as molecular orientations and order,which can be obtained directly,or molecular density,which can be acquired *** molecular behaviors are considered the basic factors for determining the tribological properties of ***,owing to its ability to detect the molecular behavior in buried interfaces in situ and in real time,SFG vibrational spectroscopy has become one of the most appealing technologies for characterizing mechanisms at friction *** paper briefly introduces the development of SFG vibrational spectroscopy and the essential theoretical background,focusing on its application in friction and lubrication interfaces,including film-based,complex oil-based,and water-based lubricating ***-time detection using SFG promotes the nondestructive investigation of molecular structures of friction interfaces in situ with submonolayer interface sensitivity,enabling the investigation of friction *** review provides guidance on using SFG to conduct friction analysis,thereby widening the applicability of SFG vibrational spectroscopy.

关键词： SFG vibrational spectroscopy film-based lubricating systems complex oil-based lubricating systems water-based lubricating systems

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Fabricating AC/DC nanogenerators based on single ZnO nanowires by using a nanomanipulator in a scanning electron microscope

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Nanotechnology and Precision Engineering 2024年第2期7卷 25-31页

作者： Mei Liu Mengfan He Aristide Djoulde Lingdi Kong Weilin Su Xin Bai Jinbo Chen Jinjun Rao Zhiming Wang Shanghai Key Laboratory of Intelligent Manufacturing and Robotics School of Mechatronic Engineering and AutomationShanghai UniversityShanghai 200444China Guangdong Provincial Key Laboratory of Fuel Cell Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641China

Single zinc oxide nanowires(ZnO NWs)are promising for nanogenerators because of their excellent semiconducting and piezoelectric properties,but characterizing the latter efficiently is *** reported here,an electrical breakdown strategy was used to construct single ZnO NWs with a specific *** the high operability of a nanomanipulator in a scanning electron microscope,ZnO-NW-based twoprobe and three-probe structures were constructed for fabricating AC/DC nanogenerators,*** a ZnO NW,an AC output of between−15.31 mV and 5.82 mV was achieved,while for a DC nanogenerator,an output of24.3 mV was ***,the three-probe structure’s output method was changed to verify the distribution of piezoelectric charges when a single ZnO NW is bent by a probe,and DC outputs of different amplitudes were *** study provides a low-cost,highly convenient,and operational method for studying the AC/DC output characteristics of single NWs,which is beneficial for the further development of nanogenerators.

关键词： Zinc oxide nanowire Piezoelectric properties Nanomanipulator SEM AC/DC nanogenerators

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A bi-functional catalyst strategy to selectively regulate sulfur redox kinetics in lithium-sulfur batteries

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Journal of Materials Science & technology 2024年第6期173卷 54-62页

作者： Yanan Liu Xiaoxiao Huang Honglei Zhang Guangyu Qin Xiaoshuang Wang Meixiu Song Hongbo Liang Jingzhe Hong Yudong Huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China

Designing electrochemical catalysts has become a research hotspot due to their accelerating the polysulfide conversion of the sulfur cathode to inhibit the“shuttle effect”in lithium-sulfur ***,it is still a great challenge to design the heterogeneous selective electrochemical catalyst for inhibiting the“shuttle effect”.Herein,nickel cobalt phosphide and cobalt phosphide as the heterogeneous catalyst active sites embedded in the nitrogen-doped hollow carbon nanocages(NiCoP@CoP/NC)are reported,used for multi-step and multi-phase sulfur electrode reaction,and it is found that metal-sulfur d-p hybridization can effectively indicate the intrinsic catalytic activity of metal *** of labor and cooperation of the bi-active NiCoP@CoP as heterogeneous catalysts propel the stepwise polysulfide *** and CoP sites preferentially accelerate the long-chain polysulfide conversion reaction(S_(8)■LiPSs)and the short-chain polysulfide conversion reactions(LiPSs■Li_(2)S),***,the hollow and porous N-doped carbon structure can successfully suppress the volume effect and improve the conductivity of the sulfur *** unique design can obtain an effective inhibition of the shuttle effect and rapid electrode *** a result,Li-S batteries demonstrate a high initial capacity of 1063 mAh g^(-1) and a low-capacity decay of 0.04% per cycle within 1000 *** work provides a feasible idea for the design of host materials in Li-S batteries.

关键词： Shuttle effect d-p hybridization Heterogeneous catalysts Stepwise polysulfide conversion

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Design of Automatic Loading and Unloading Manipulator for CNC Gear Milling Machine

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Recent Patents on Mechanical Engineering 2023年第5期16卷 335-344页

作者： Chen, Zhong Gao, Xin Yang, Hu Song, Zuxiao Wang, Yongfang Jiangsu Key Laboratory of Advanced Manufacturing Technology Huaiyin Institute of Technology 1 Meicheng Rd Jiangsu Huaian223003 China

Background: At present, due to the widespread use of robotic arms for the automatic loading and unloading of CNC gear milling machines, there has been an increase in patents related to robotic arms. However, these robotic arms have issues of low efficiency and large space occupation. To solve these problems, a CNC gear milling machine with an automatic loading and unloading manipulator device needs to be designed. Methods: This paper first designs the overall scheme of the automatic loading and unloading manipulator, and then uses Solidworks to establish a three-dimensional model. Finite element analysis software is used to analyze and simulate the deformation, stress distribution, and service life of the key components in the overall device. Finally, a prototype of the robotic arm is created based on the simulation optimization results. Results: This paper designs a new type of automatic loading and unloading manipulator device for CNC gear milling machines, which is different from existing patents in that all its components are installed inside the machine tool protective cover. In production experiments, the operation was found to be stable and reliable, and the loading and unloading process was completed at a speed of 11s/time, consistently exceeding the manual maximum speed of 19s/time. The results indicate that the proposed clamp storage system and core rod perforation feeding method are effective. Conclusion: The new design solves the problems of low efficiency and large space occupation in existing robotic arm patents. © 2023 Bentham Science Publishers.

关键词： Manipulators

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Improved Double Deep Q Network Algorithm Based on Average Q-Value Estimation and Reward Redistribution for Robot Path Planning

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Computers, Materials & Continua 2024年第11期81卷 2769-2790页

作者： Yameng Yin Lieping Zhang Xiaoxu Shi Yilin Wang Jiansheng Peng Jianchu Zou Key Laboratory of Advanced Manufacturing and Automation Technology Guilin University of TechnologyEducation Department of Guangxi Zhuang Autonomous RegionGuilin541006China Guangxi Key Laboratory of Special Engineering Equipment and Control Guilin University of Aerospace TechnologyGuilin541004China Guilin Mingfu Robot Technology Company Limited Guilin541199China Key Laboratory of AI and Information Processing Education Department of Guangxi Zhuang Autonomous RegionHechi UniversityYizhou546300China

By integrating deep neural networks with reinforcement learning,the Double Deep Q Network(DDQN)algorithm overcomes the limitations of Q-learning in handling continuous spaces and is widely applied in the path planning of mobile ***,the traditional DDQN algorithm suffers from sparse rewards and inefficient utilization of high-quality *** those problems,an improved DDQN algorithm based on average Q-value estimation and reward redistribution was ***,to enhance the precision of the target Q-value,the average of multiple previously learned Q-values from the target Q network is used to replace the single Q-value from the current target Q ***,a reward redistribution mechanism is designed to overcome the sparse reward problem by adjusting the final reward of each action using the round reward from trajectory ***,a reward-prioritized experience selection method is introduced,which ranks experience samples according to reward values to ensure frequent utilization of high-quality ***,simulation experiments are conducted to verify the effectiveness of the proposed algorithm in fixed-position scenario and random *** experimental results show that compared to the traditional DDQN algorithm,the proposed algorithm achieves shorter average running time,higher average return and fewer average *** performance of the proposed algorithm is improved by 11.43%in the fixed scenario and 8.33%in random *** not only plans economic and safe paths but also significantly improves efficiency and generalization in path planning,making it suitable for widespread application in autonomous navigation and industrial automation.

关键词： Double Deep Q Network path planning average Q-value estimation reward redistribution mechanism reward-prioritized experience selection method

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Analysis of the effect of circular spline tooth profile parameters on flexspline gear stress based on response surface methodology 10

Analysis of the effect of circular spline tooth profile para...

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2024 10th International Conference on Applied Materials and manufacturing technology, ICAMMT 2024

作者： Ma, Honglie Zhang, Tao Yang, Congbin Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Beijing100124 China

This study presents a simulation model for the wave generator and flexspline assembly, examining the relationship between radial and main section deformations. Adjusting the wall thickness enables interference-free meshing of various sections. A response surface model for the effect of circular spline profile parameters on flexspline stress has been established. To assess how various parameters of the involute gear profile affect the meshing stress of flexspline. Thus providing a theoretical basis for optimizing gear profile modifications. © Published under licence by IOP Publishing Ltd.

关键词： Splines

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Surface chemical microenvironment engineering of catalysts by organic molecules for boosting electrocatalytic reaction

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Chinese Chemical Letters 2024年第8期35卷 15-24页

作者： Xianxu Chu Lu Wang Junru Li Hui Xu Henan Key Laboratory of Biomolecular Recognition and Sensing College of Chemistry and Chemical EngineeringShangqiu Normal UniversityShangqiu 476000China Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation CenterChangzhou UniversityChangzhou 213164China

Electrocatalysis is a surface-sensitive process,in which the catalytic activity of electrocatalyst highly re-lates to the surface adsorption/desorption behaviors of the reactants/intermediates/products on the cat-alytically active *** chemical microenvironment engineering via organic molecules functional-ization is a promising strategy to tune the electrocatalytic activity since it can well modify the elec-trode/electrolyte interface and alter the reaction *** this review,we summarize the recent progress of surface microenvironment engineering of electrocatalysts induced by organic molecules func-tionalization,with the special focus on the organic molecule-assisted growth mechanism and unique electronic *** importantly,the applications of organic molecule functionalized catalysts in var-ious electrocatalytic reactions are also systematically summarized,along with a deep discussion on the conclusion and *** work will open a new avenue for the construction and modification of advanced electrocatalysts based on organic molecule-mediated interface engineering.

关键词： Chemical microenvironment engineering Organic molecules Electrocatalysis Functionalization Interface

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Preload Control Method of Threaded Fasteners:A Review

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Chinese Journal of Mechanical Engineering 2024年第5期37卷 40-59页

作者： Xing Yan Zhifeng Liu Mingpo Zheng Ying Li Yuezhen Wang Wentao Chen College of Mechanical&Energy Engineering Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing 100124China Key Laboratory of CNC Equipment Reliability Ministry of EducationSchool of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130012China

Threaded fasteners are one of the most commonly used connection methods for mechanical *** primary function is to generate appropriate clamping forces and fasten the connected *** inappropriate preload can cause loosening,fatigue fracture,and other *** will affect the safety and reliability of mechanical *** precise control of the preload has become a critical issue in mechanical assembly *** the past few decades,various tightening measures and methods have been proposed to address this ***,many problems continue to exist with practical applications that have not been reviewed comprehensively and ***,various control methods were summarized systematically,and their advantages and disadvantages in engineering applications were *** control is the most widely used tightening method owing to its simple operation and low ***,the research on the torque control method was summarized systematically from three aspects:the torque-preload correlation formula,effective friction radius,and friction characteristics during *** addition,the special circumstances that may increase preload uncertainty were ***,based on a summary of the current research status,the prospects for future research were *** study would aid researchers in extensively understanding the problems in preload control.

关键词： Threaded fasteners Preload Tightening method Torque control method Friction characteristics

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