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A highly ionic conductive succinonitrile-based composite solid electrolyte for lithium metal batteries

Nano Research 2022年第6期15卷 5153-5160页

作者： Genrui Qiu yapeng shi Bolong Huang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China

Solid-state Li metal batteries with solid electrolytes have built a potential way to solve the safety and low energy density problems of current commercial Li-ion batteries with liquid electrolyte.As a key component of solid-state Li metal batteries,solid electrolytes require high ionic conductivities and good mechanical properties.We have designed a composite solid electrolyte(CSE)consisting of poly(vinylidene fluoride-hexafluoropropylene)(PVDF-HFP)-Li_(6.5)La_(3)Zr_(1.5)Ta_(0.5)O_(12)(LLZTO)-succinonitrile(SN)and Li bis(trifluoromethylsulphonyl)imide(LiTFSI).The PVDF-HFP-based porous matrix made by electrospinning ensures good mechanical properties of the electrolyte membrane,and the large proportion of SN filling material makes the electrolyte membrane have an ionic conductivity of 1.11 mS·cm^(–1)without the addition of liquid electrolyte.The symmetric battery assembled with CSE can be cycled stably for more than 600 h,and the LiFePO4|CSE|Li full battery can also be cycled stably for more than 200 cycles.In addition to Li metal batteries,Li-O_(2)and Li-CO_(2)batteries that use CSE as electrolytes also have good performances,reflecting the universality of CSE.CSE does not only guarantee good mechanical properties but also obtain a high ionic conductivity.This design provides a new idea for the commercial application of polymer-based solid batteries.

关键词： Li metal batteries composite solid-state electrolyte succinonitrile ionic conductivity mechanical strength

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A Unified Trajectory Optimization Approach for Long-Term and Reactive Motion Planning of Legged Locomotion

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Journal of Bionic Engineering 2023年第5期20卷 2108-2122页

作者： yapeng shi Bin Yu Kaixian Ba Mantian Li School of Mechanical Engineering Yanshan UniversityNo.438 West Hebei AvenueQinhuangdao066004HebeiPeople’s Republic of China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin150001People’s Republic of China

This paper proposes a unified trajectory optimization approach that simultaneously optimizes the trajectory of the center of mass and footholds for legged locomotion.Based on a generic point-mass model,the approach is formulated as a nonlinear optimization problem,incorporating constraints such as robot kinematics,dynamics,ground reaction forces,obstacles,and target location.The unified optimization approach can be applied to both long-term motion planning and the reactive online planning through the use of model predictive control,and it incorporates vector field guidance to converge to the long-term planned motion.The effectiveness of the approach is demonstrated through simulations and physical experiments,showing its ability to generate a variety of walking and jumping gaits,as well as transitions between them,and to perform reactive walking in obstructed environments.

关键词： Legged locomotion Motion planning Trajectory optimization Bionic robot

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Intelligent self-powered sensor based on triboelectric nanogenerator for take-off status monitoring in the sport of triplejumping

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Nano Research 2022年第7期15卷 6483-6489页

作者： Jiahui Xu Xuelian Wei Ruonan Li yapeng shi Yating Peng Zhiyi Wu Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Nanoscience and Technology University of Chinese Academy of ScienceBeijing 100049China School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China CUSTech Institute of Technology Wenzhou 325024China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

In the era of big data and the Internet of Things,the digital information of athletes is particularly significant in sports competitions.Here,an intelligent self-powered take-off board sensor(TBS)based on triboelectric nanogenerator(TENG)with a solid-wooden substrate is provided for precise detection of athletes’take-off status in the sport of triple-jumping,which is sufficient for triplejumping training judgment with a high accuracy of 1 mm.Meanwhile,a foul alarm system and a distance between the athlete’s foot and take-off line(GAP)measurement system are further developed to provide take-off data for athletes and referees.The induced charges are formed by the TBS during taking-off,and then the real-time exercise data is acquired and processed via the test program.This work presents a self-powered sports sensor for intelligent sports monitoring and promotes the application of TENG-based sensors in intelligent sports.

关键词： self-powered sports sensor triboelectric nanogenerator triple jump intelligent sports

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Negative enthalpy alloys and local chemical ordering:a concept and route leading to synergy of strength and ductility

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National Science Review 2024年第4期11卷 172-184页

作者： Zibing An Tao Yang Caijuan shi Shengcheng Mao Lihua Wang Ang Li Wei Li Xianmeng Xue Ming Sun Yifan Bai yapeng He Fuzeng Ren Zhouguang Lu Ming Yan Yang Ren Chain-Tsuan Liu Ze Zhang Xiaodong Han Beijing Key Lab of Microstructure and Property of Advanced Materials College of Materials Science &Engineering Beijing University of Technology Department of Materials Science and Engineering City University of Hong Kong Key Laboratory of Partial Acceleration Physics& Technology Institute of High Energy PhysicsChinese Academy of Sciences Department of Materials Science &Engineering Southern University of Science and Technology Department of Physics City University of Hong Kong State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University

Solid solutions are ubiquitous in metals and alloys. Local chemical ordering(LCO) is a fundamental sub-nano/nanoscale process that occurs in many solid solutions and can be used as a microstructure to optimize strength and ductility. However, the formation of LCO has not been fully elucidated, let alone how to provide efficient routes for designing LCO to achieve synergistic effects on both superb strength and ductility. Herein, we propose the formation and control of LCO in negative enthalpy alloys. With engineering negative enthalpy in solid solutions, genetic LCO components are formed in negative enthalpy refractory high-entropy alloys(RHEAs). In contrast to conventional ‘trial-and-error' approaches, the control of LCO by using engineering negative enthalpy in RHEAs is instructive and results in superior strength(1160 MPa) and uniform ductility(24.5%) under tension at ambient temperature, which are among the best reported so far. LCO can promote dislocation cross-slip, enhancing the interaction between dislocations and their accumulation at large tensile strains; sustainable strain hardening can thereby be attained to ensure high ductility of the alloy. This work paves the way for new research fields on negative enthalpy solid solutions and alloys for the synergy of strength and ductility as well as new functions.

关键词： negative enthalpy alloys local chemical ordering strength ductility dislocation

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A self-powered and concealed sensor based on triboelectric nanogenerators for cultural-relic anti-theft systems

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Nano Research 2022年第9期15卷 8435-8441页

作者： Baocheng wang Xiaoying Zhai Xuelian Wei yapeng shi Xiaoqing Huo Ruonan Li Zhiyi Wu Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Nanoscience and Technology University of Chinese Academy of ScienceBeijing 100049China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072China CUSTech Institute of Technology Wenzhou 325024China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

The theft prevention for cultural relics in museums,field excavation sites,and temporary exhibition events is of extreme importance.However,traditional anti-theft technologies such as infrared monitoring and radio frequency identification are highly costly,power-consuming,and easy to break.Here,a transparent,ultrathin,and flexible triboelectric sensor(TUFS)with a simple and low-cost method is proposed.With a thickness,weight,and transmittance of 92μm,0.12 g,and 89.4%,the TUFS manifests superb concealment.Benefiting from the characteristic of triboelectric nanogenerators,the TUFS responds effectively to common cultural-relic materials.Moreover,distinguished electrical responses can be obtained even for very small weights(10 g)and areas(1 cm^(2)),proving the sensitivity and wide range of use of the TUFS.Finally,we construct a concealed cultural-relic anti-theft system that enables real-time alarming and accurate positioning of cultural relics,which is expected to strengthen the security level of the existing museum anti-theft systems.

关键词： concealed sensor self-powered triboelectric nanogenerator cultural relic anti-theft

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Force-controlled Compensation Scheme for P-Q Valve-controlled Asymmetric Cylinder used on Hydraulic Quadruped Robots

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Journal of Bionic Engineering 2020年第6期17卷 1139-1151页

作者： yapeng shi Mantian Li Fusheng Zha Lining Sun Wei Guo Cong Ma Zhibin Li State Key Laboratory of Robotics and System Harbin Institue of TechnologyHarbin 150001China Shenzhen Academy of Aerospace Technology China Aerospace ScienceShenzhen 518057China School of Informatics The University of EdinburghEdinburgh EH89ABUnited Kingdom

Under the requirement of the force controller of hydraulic quadruped robots,the goal of this work is to accurately track the force commands at the level of the hydraulic drive unit.The main contribution focuses on the development of a force-controlled compensation scheme,which is specifically aimed at the key issues affecting the hydraulic quadrupedal locomotion.With this idea,based on a P-Q valve-controlled asymmetric cylinder,we first establish a mathematical model for the hydraulic drive unit force control system.With the desired force commands,a force feed-forward algorithm is presented to improve the dynamic performance of the system.Meanwhile,we propose a disturbance compensation algorithm to reduce the influence induced by external disturbances due to foot-ground impacts.Afterwards,combining with a variable gain PI controller,a series of experiments are implemented on a force control performance test platform to verify the proposed scheme.The results demonstrate that the force-controlled compensation scheme has the ability to notably improve the force tracking accuracy,reduce the response time and redundant force.

关键词： hydraulic drive unit force tracking P-Q valve-controlled asymmetric cylinder hydraulic quadruped robot

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高熵形状记忆合金相变行为研究现状

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稀有金属材料与工程 2024年第3期53卷 848-855页

作者：赵燕春冯远飞冯力李文生史亚鹏寇生中段望春兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室甘肃兰州730050 兰州理工大学温州泵阀工程研究院浙江温州325105 甘肃省机械工程研究院增材制造与新材料事业部甘肃兰州730000

随着先进工程技术对形状记忆合金性能要求的不断提高,传统形状记忆合金愈发难以满足要求,高熵形状记忆合金应运而生,引起了研究者的极大关注。高熵形状记忆合金相较于传统形状记忆合金具有显著提高的可回复应变、屈服强度、高温物相稳... 详细信息

随着先进工程技术对形状记忆合金性能要求的不断提高,传统形状记忆合金愈发难以满足要求,高熵形状记忆合金应运而生,引起了研究者的极大关注。高熵形状记忆合金相较于传统形状记忆合金具有显著提高的可回复应变、屈服强度、高温物相稳定性和超弹性等特性,具有广阔的应用前景。本文对高熵形状记忆合金的研究现状、马氏体相变和形状记忆效应等进行了简要的论述,并对高熵形状记忆合金目前存在的不足和未来的发展进行了展望。

关键词：高熵形状记忆合金形状记忆效应马氏体相变微观组织结构

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超高性能混凝土预制板-叠合剪力墙抗震性能研究

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地震工程与工程振动 2024年第3期44卷 96-107页

作者：常亚峰尹文哲侯亚鹏曹小杉师俊平梁兴文陕西省建筑科学研究院有限公司陕西西安710082 西安理工大学土木建筑工程学院陕西西安710048 西安建筑科技大学土木学院陕西西安710055

通过对1片现浇混凝土剪力墙和4片超高性能混凝土(ultra-high performance concrete, UHPC)预制板-叠合剪力墙抗震性能试验,研究了其滞回性能、抗弯承载力、延性、刚度和耗能能力等指标,分析了高宽比、聚乙烯泡沫(expanded polystyrene, ... 详细信息

通过对1片现浇混凝土剪力墙和4片超高性能混凝土(ultra-high performance concrete, UHPC)预制板-叠合剪力墙抗震性能试验,研究了其滞回性能、抗弯承载力、延性、刚度和耗能能力等指标,分析了高宽比、聚乙烯泡沫(expanded polystyrene, EPS)芯模置换和竖向钢筋连接方式对其抗震性能的影响。结果表明:与现浇混凝土剪力墙相比,UHPC预制板-叠合墙具有优异的抗震性能,最大受弯承载力增大;UHPC预制板和钢筋桁架可较好地与空腔内现浇混凝土协同工作;UHPC叠合墙的滞回曲线、骨架曲线和刚度退化曲线与现浇混凝土剪力墙趋势基本一致;在本试验剪力墙的高宽比范围内,高宽比越小,UHPC预制板-叠合墙的受弯承载力和刚度越大,耗能越差;EPS芯模置换可提高叠合剪力墙屈服后的耗能能力,降低了UHPC叠合墙的延性;仅采用暗柱竖向钢筋与底座进行连接,对UHPC叠合墙的受弯承载力和耗能影响较小,但却可以很大程度方便施工。

关键词： UHPC预制板叠合剪力墙抗震性能置换芯模连接钢筋

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异质梯度纳米结构金属的研究现状

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稀有金属材料与工程 2024年第4期53卷 1195-1206页

作者：赵燕春吕志马虎文史亚鹏毛丰寇生中段望春冯力兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室甘肃兰州730050 兰州理工大学温州泵阀工程研究院浙江温州325105 甘肃省机械工程研究院增材制造与新材料事业部甘肃兰州730000

强度-塑性倒置普遍存在于传统均匀或随机微观结构的金属材料,而梯度纳米结构材料由于其晶粒尺寸呈梯度变化,变形过程中不同特征尺寸的结构相互协调,使其具有优异的综合力学性能。近年来,由不同性质的非均质区域构成异质结构的设计理论... 详细信息

强度-塑性倒置普遍存在于传统均匀或随机微观结构的金属材料,而梯度纳米结构材料由于其晶粒尺寸呈梯度变化,变形过程中不同特征尺寸的结构相互协调,使其具有优异的综合力学性能。近年来,由不同性质的非均质区域构成异质结构的设计理论、制备方法和变形机理逐步完善。本文总结了梯度结构、双峰结构、谐波结构、异质层状结构、分散纳米域和层状纳米孪晶结构等异质结构金属材料的分类及制备方法。结合梯度纳米结构金属在应力加载过程中非均匀塑性变形行为,总结其强塑性机制,包括梯度塑性、几何必须位错、机械驱动的晶粒粗化、表面残余应力和表面扰动和剪切带行为等,并讨论其未来发展所面临的挑战。

关键词：异质结构材料梯度纳米结构力学性能制备方法

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Controllable Construction of Bifunctional CoxP@N,P-Doped Carbon Electrocatalysts for Rechargeable Zinc–Air Batteries

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Energy & Environmental Materials 2022年第2期5卷 515-523页

作者： Qing shi Qiao Liu yapeng Zheng Yaqian Dong Lin Wang Hantao Liu Weiyou Yang Institute of Materials Ningbo University of TechnologyNingbo 315211China School of Energy and Power Engineering North University of ChinaTaiyuan 030051China

The exploration of cheap,efficient,and durable bifunctional electrocatalysts for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is highly desired to push forward the commercialization of rechargeable ... 详细信息

关键词： oxygen evolutionreaction oxygenreductionreaction transitionmetal phosphides Zn-air batteries

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