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Recent advances in cathodes for all-solid-state lithium-sulfur batteries

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Chinese Chemical Letters 2023年第7期34卷 58-69页

作者： Shengbo Yang Bo wang Qiang Lv Nan Zhang Zekun Zhang Yutong Jing Jinbo Li Rui Chen Bochen Wu Pengfei Xu dianlong wang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage State Key Laboratory of Urban Water Resource and EnvironmentSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

Lithium-sulfur(Li-S)batteries have been regarded as the candidate for the next-generation energy storage system due to the high theoretical specific capacity(1675 m Ah/g), energy density(2600 Wh/kg)and the abundance of elemental sulfur, but the application of Li-S batteries is impeded by a series of problems. Recently, all-solid-state Li-S batteries(ASSLSBs) have drawn great attention because many drawbacks such as safety issues caused by metallic lithium anodes and organic liquid electrolytes can be overcome through the use of solid-state electrolytes(SEs). However, not only the problems brought by sulfur cathodes still exist, but more trouble arouses from the interfaces between SEs and cathodes, hampering the practical application of ASSLSBs. Therefore, in order to deal with the problems, enormous endeavors have been done on ASSLSB cathodes during the past few decades, including engineering of cathode active materials, cathode host materials, cathode binder materials and cathode structures. In this review, the electrochemical mechanism and existing problems of ASSLSBs are briefly introduced. Subsequently, the strategies for developing cathode materials and designing cathode structures are presented. Then there follows a brief discussion of SE problems and expectations, and finally, the challenges and perspectives of ASSLSBs are summarized.

关键词： All-solid-state Li-S battery Cathode active material Cathode host material Cathode structure Solid-state electrolyte

Study of Co-Ce coating and surface on pasted nickel electrodes substrate

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Rare Metals 2006年第Z1期25卷 47-50页

作者： wang dianlong wang Chunyu DAI Changsong SUN Dezhi Post Doctor Workstation of Environmental Protection Technology Corporation Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Post Doctor Workstation of Environmental Protection Technology Corporation Harbin Institute of Technology Harbin 150001 China

The process of electroplating Co-Ce alloys on the nickel foam framework surface can improve electro-conductivity for active materials and nickel substrate interface. The results of inductive coupled plasma emission spectrometer (ICP), cyclic voltammetry (CV), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA) indicate that the Co-Ce coating chemical content of rare earth Ce 0.19wt.%-0.28wt.% can not only alter the microstructure of electroplating coating, but also accelerate the oxidation reaction of Co and improve its transfer rate of electric current conductivity to the active material particles. The grads-like distributing electro-conductive network of CoOOH is formed on the nickel substrate surface, which improves reversibility of pasted nickel electrode. The charging receptivity is improved by Co-Ce coating on the pasted nickel electrode substrate, and its specific discharging capacity is improved by 50%.

关键词： Co-Ce coating surface grades-like distributing electro-conductive networks

Control theorem of a universal uniform-rotating magnetic vector for capsule robot in curved environment

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Science China(Technological Sciences) 2013年第3期56卷 359-368页

作者： ZHANG YongShun wang Na DU ChunYu SUN Ying wang dianlong Key Laboratory for Precision & Non-traditional Machining of Ministry of Education of China Dalian University of Technology

For realizing non-contact steering swimming of a capsule robot in curved environment filled with viscous liquid, based on spa- tial orthogonal superposition theorem of alternating magnetic vectors, an innovative physical method is proposed, which em- ploys three-axis orthogonal square Helmholtz coils fed with three phase sine currents to create a universal uniform magnetic spin vector as energy source. According to the antiphase sine current superposition theorem generalized in this paper, an effec- tive control method for successively adjusting the orientation and the rotating direction of the universal magnetic spin vector is proposed. For validating its feasibility and controllability, three-axis Helmholtz coils, power source and an innovative capsule robot prototype were manufactured, experiments were conducted in both spiral pipe and animal intestine. It was demonstrated that the orientation and the rotational direction of the universal uniform-magnetic spin vector can be adjusted successively through digital control and steering swimming of the capsule robot in spiral intestine can be achieved successfully. The breakthrough of the universal rotating uniform-magnetic vector will push forward the development of modern physics and biomedical engineering

关键词： capsule robot universal magnetic spin vector anti-phase sine current superposition theorem

Control strategy for multiple capsule robots in intestine

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Science China(Technological Sciences) 2011年第11期54卷 3098-3108页

作者： ZHANG YongShun wang dianlong RUAN XiaoYan JIANG ShenYuan LU Jie Key Laboratory for Precision ＆ Non-traditional Machining of Ministry of Education of China Dalian University of Technology Dalian 116023 China Mechanical Engineering School Beihua University Jilin 132021 China

Based on the critical gap phenomenon of the intestinal capsule robot,a variable-diameter capsule robot with radial gap self-compensation is developed in this *** the functional variation principle,a fluid dynamic pressure model satisfying the boundary conditions of the outer surface of capsule robot with screw blades is *** critical gap phenomenon is studied theoretically and experimentally based on the end effect and the dynamic balance characteristics of the fluid on the surface of capsule *** concept of start-up rotation speed is defined,the relationship between the start-up rotation speed and the spiral parameters of capsule robot is *** strategy for implementing drive and control on several capsule robots under the same rotational magnetic field is proposed,and by defining the start-up curves of several capsule robots with the similar motion regulation as the objective functions,genetic algorithm is employed to optimize the spiral parameters of several capsule *** have shown that the proposed drive and control strategy for several capsule robots can be implemented *** has a good prospect of application inside intestine to realize the drive and control on several capsule robots for different medical purposes.

关键词： variable-diameter capsule robot radial gap compensation critical gap phenomenon start-up rotation speed multiple capsule robot control

Optimal Control of a Universal Rotating Magnetic Vector for Petal-shaped Capsule Robot in Curve Environment

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 880-889页

作者： ZHANG Yongshun BAI Jianwei CHI Minglu CHENG Cunxin wang dianlong Key Laboratory for Precision and Non-Traditional Machining of Ministry of Education Dalian University of Technology

Steering control of a capsule robot in curve environment by magnetic navigation is not yet solved completely.A petal-shaped capsule robot with less steering resistance based on multiple wedge effects is presented,and an optimization method with two processes for determining the orientation of a pre-applied universal magnetic spin vector is *** realize quick and non-contact steering swimming,a fuzzy comprehensive evaluation method for optimizing the steering driving angle is presented based on two evaluation indexes including the average steering speed and the average steering trajectory deviation,achieving the initial optimal orientation of a universal magnetic spin *** further reduce robotic magnetic vibration,a main target method for optimizing its final orientation,which is used for fine adjustment,is employed under the constrains of the magnetic *** experimental results in curve pipe verified the effectiveness of the optimization method,which can be effectively used to realize non-contact steering swimming of the petal-shaped robot and reduce its vibration.

关键词： petal-shaped capsule robot universal magnetic spin vector fuzzy comprehensive evaluation method main target method

Effects of Al,F dual substitutions on the structure and electrochemical properties of lithium manganese oxide

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Journal of University of Science and Technology Beijing 2008年第2期15卷 182-186页

作者： Tingfeng Yi Xinguo Hu dianlong wang Huibin Huo School of Chemistry and Chemical Engineering Anhui University of Technology Maanshan 243002 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China

Spinel LiMn2O4 and F, Al-doped spinel LiAl0.05Mn1.95O3.58F0.02 have been synthesized by a soft chemistry method using adipic acid as the chelating agent. The synthesized spine/materials were characterized by differential thermal analysis （DTA） and thermogravimetery （TG）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, cyclic voltammetry （CV）, and chargedischarge testing. The results indicate that all the samples have high phase purity, and fluorine is important in controlling the morphology; the doped aluminum enhances the stability of spinel LiMn2O4. The charge-discharge tests indicate that LiAl0.05Mn1.95O4 has high capacity retention, which is 92.60% of the initial after 50 cycles. It is found that the novel compound LiAl0.05Mn1.95O3.98F0.02 with smaller particles can offer much higher capacity, whose initial discharge capacity is 126.5 mAh·g^-1. The cyclic voltammetric experiments disclose the enhanced reversibility of the F, Al^3＋-modified spinel as compared with the undoped spinel.

关键词： lithium ion battery cathode material soft chemistry method structure electrochemical properties

THEORY AND EXPERIMENTAL INVESTIGAION OF FLEXURAL WAVE PROPAGATION IN THIN RECTANGULAR PLATE WITH PERIODIC STRUCTURE

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Chinese Journal of Mechanical Engineering 2005年第3期18卷 385-388页

作者： Wen Jihong Yu dianlong wang Gang Zhao Hongang Liu Yaozong College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China

With the idea of the phononic crystals, a thin rectangular plate with two-dimensional periodic structure is designed. Flexural wave band structures of such a plate with infinite structure are calculated with the plane-wave expansion （PWE） method, and directional band gaps are found in the ΓX direction. The acceleration frequency response in the ΓX direction of such a plate with finite structure is simulated with the finite element method and verified with a vibration experiment. The frequency ranges of sharp drops in the calculated and measured acceleration frequency response curves are in basic agreement with those in the band structures. Thin plate is a widely used component in the engineering structures. The existence of band gaps in such periodic structures gives a new idea in vibration control of thin plates.

关键词： Phononic crystals Flexural wave band gaps Thin rectangular plate

Dynamic characteristics of an intestine capsule robot with variable diameter

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Chinese Science Bulletin 2010年第17期55卷 1813-1821页

作者： ZHANG YongShun JIANG ShengYuan ZHANG XueWen YU HongHai wang dianlong GUO DongMing Key Laboratory for Precision & Non-traditional Machining of Ministry of Education of China Dalian University of Technology Dalian 116023 China Mechanical Engineering School Beihua University Jilin 132021 China

This paper proposes an intestine capsule robot with variable diameter. It is driven by external rotating magnetic field and has the function of automatic radial clearance compensation. An external magnetic field generating device and a capsule robot with variable diameter are developed. Radial dynamic balance equation and kinematics equation of the capsule robot traveling inside flexible elasto-wall environment are established, and dynamic characteristics of the capsule robot inside flexible elasto-wall pipe and rigid wall pipe environments are analyzed and compared. Simulations and experiment results show that its dynamic characteristics in both pipes are almost the same. Under the action of radial clearance compensation, fluid dynamic pressure around outer surface of the capsule robot and its propulsion, as well as its adaptability to diameter change range, are significantly improved. Its propulsion and moving speed are controlled by adjusting rotating angular speed of the rotating magnetic field. This innovative capsule robot with radial clearance compensation has a promising prospect for inside intricate gastrointestinal (GI) tract in non-invasive therapy applications.

关键词：动态特性机器人变直径胶囊胃肠动力平衡方程径向间隙旋转磁场

Characteristics of spatial magnetic torque of an intestine capsule micro robot with a variable diameter

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Science China(Technological Sciences) 2009年第7期52卷 2079-2086页

作者： ZHANG YongShun YUE Ming GUO DongMing wang dianlong YU HongHai JIANG ShengYuan ZHANG XueWen Key Laboratory for Precision&Non-traditional Machining of Ministry of Education Dalian University of TechnologyDalian 116024China School of Automotive Engineering Dalian University of TechnologyDalian 116024China Mechanical Engineering School Beihua UniversityJilin 132021China

A drive and control method is put forward for a variable diameter capsule micro robot to screw forward in intestine using magnetic coupling between an inner actuator inside the robot and the rotational magnetic field generated by a rotating outer actuator. The structures of the outer and inner actuators are magnet cylinders with multiple magnetic poles in tegular shape alternating with dissimilar radial magnetization. An universal mathematical model of magnetic torque at eccentric state is established based on the equivalent magnetic charge method, and the characteristics of magnetic torque with respect to structural parameters of actuators are theoretically studied. Experiments show that the driving method features advantages such as powerful magnetic torque, high safety, reliability, etc. The driving ability of the variable diameter capsule micro robot is greatly improved by its automatic radial clearance compensation. The magnetic drive system has a promising prospect of medical applications in intestine.

关键词： variable diameter capsule robot, Radial offset distance Magnetic torque, Equivalent magnetic charge method