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学者姓名:张跃飞
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Abstract :
Lithium (Li) metal is a promising candidate for next-generation anode materials with high energy densities. However, Li dissolution/deposition processes are limited at the upper surface in contact with the electrolyte, which brings a locally high current density and then results in dendritic Li growth. This restraint of the local surface reaction during cycling has not been solved by commonly used modification strategies. In this study, a three-dimensional (3D) Li+ conductive skeleton is activated from atomic layer deposition (ALD) coating Li3PO4 (LPO) on the surface of the Ni foam (LPNF). Then, the skeleton is efficiently constructed in the Li metal anode by the lower-temperature Li infusion. Ionic conductor LPO layers and electronic conductor Ni fibers supply charge transport channels between the electrolyte and the internal Li. The mixed conductive network realizes holistic charge transfer, which is proved by in situ scanning electron microscopy experiments. In virtue of dispersive dissolution/deposition and optimized electrochemical kinetics brought by a Li+ conductive network, the composited Li electrode presents an excellent symmetric battery cycling stability (over 1200 h) and enhanced rate performances (stable cycling even at 10.0 mA cm-2). When matching with a LiCoO2 (LCO) cathode, LCO||Li@LPNF full batteries exhibit a capacity retention of 80.8% over 250 cycles. During cycling, there was no evidence of dendrite growth and the remaining Li in the composited anode showed a smooth, compact, and well-combined condition with LPNF. Through constructing a 3D Li+ conductive network, the composited Li metal anode breaks through the limit of the local surface reaction; this work proposes a novel insight of realizing holistic charging/discharging for the dendrite-free Li metal anode.
Keyword :
holistic charging holistic charging Li3PO4 Li3PO4 discharging discharging Li plus conductivity Li plus conductivity Li metal anode Li metal anode in situ SEM observation in situ SEM observation dendrite-free dendrite-free
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GB/T 7714 | Cao, Tianci , Cheng, Xiaopeng , Wang, Mingming et al. Realizing Holistic Charging-Discharging for Dendrite-Free Lithium Metal Anodes via Constructing Three-Dimensional Li plus Conductive Networks [J]. | ACS APPLIED MATERIALS & INTERFACES , 2023 . |
MLA | Cao, Tianci et al. "Realizing Holistic Charging-Discharging for Dendrite-Free Lithium Metal Anodes via Constructing Three-Dimensional Li plus Conductive Networks" . | ACS APPLIED MATERIALS & INTERFACES (2023) . |
APA | Cao, Tianci , Cheng, Xiaopeng , Wang, Mingming , Lu, Junxia , Niu, Jiajia , Liu, Huan et al. Realizing Holistic Charging-Discharging for Dendrite-Free Lithium Metal Anodes via Constructing Three-Dimensional Li plus Conductive Networks . | ACS APPLIED MATERIALS & INTERFACES , 2023 . |
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Abstract :
Electrochemical actuators (EAs) with capabilities of triggering large deformation are attracting great interests because of their low stimulation voltage and high durability. However, porous electrode structures (PESs) with either a large unexpected strain or small-size inserted ions lead to small actuation strain and low energy transduction efficiency. To address this problem, an ideal electrode material, namely, pyrolytic graphite (PG), with an anisotropic densely stacked electrode structure (ASES), was proposed, and the optimal insertion ion, namely, AlCl4- with a large radius, was selected. Simulations show that an ASES presents an increased actuation strain and effectively eliminates unexpected strain. In addition, the insertion of AlCl4- into the graphite layers can lead to a directionally large volume expansion (>230%) due to the low energy barrier and large ionic radius. Experimental results reveal that the PG can expand/contract repeatedly with a high linear strain of approximate to 48% under a zero stress and approximate to 32% under a load of 2.5 MPa. EAs based on PG and AlCl4- achieve excellent actuation efficiency with an energy density of 105.89 J cm(-3), power density of 0.35 W cm(-3) and a high electromechanical transduction efficiency of up to 14.30%. This design method provides a significant way to develop high-performance EAs. (c) 2022 Elsevier Ltd. All rights reserved.
Keyword :
Large anionic groups Large anionic groups Electrochemical actuators Electrochemical actuators Electromechanical transduction efficiency Electromechanical transduction efficiency Anisotropic expansion Anisotropic expansion
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GB/T 7714 | Li, Na , Wang, Peng , Shi, Huifeng et al. An ultrahigh efficiency electrochemical actuator [J]. | EXTREME MECHANICS LETTERS , 2022 , 53 . |
MLA | Li, Na et al. "An ultrahigh efficiency electrochemical actuator" . | EXTREME MECHANICS LETTERS 53 (2022) . |
APA | Li, Na , Wang, Peng , Shi, Huifeng , Chen, Ya , Yang, Le , Zhang, Yuefei et al. An ultrahigh efficiency electrochemical actuator . | EXTREME MECHANICS LETTERS , 2022 , 53 . |
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The particle morphology determined by the sintering process is the director factor affecting the electrochemical performance of Ni-rich NMC cathode materials. To prepare the ideal NMC particles, it is of great significance to understand the morphological changes during sintering process. In this work, the morphology evolution of LiNi0.8Mn0.1Co0.1O2 (NMC811) synthesis at temperature ranging from 300-1080 degrees C were observed by in situ SEM. The uniform mixture of spherical Ni0.8Mn0.1Co0.1(OH)(2) precursor and lithium sources (LiOH) was employed by high temperature solid-state process inside the SEM, which enables us to observe morphology changes in real time. The results show that synthetic reaction of LiNi0.8Mn0.1Co0.1O2 usually includes three processes: the raw materials' dehydration, oxidation, and combination, accompanied by a significant reduction in particle size, which is important reference to control the synthesis temperature. As heating temperature rise, the morphology of mixture also changed from flake to brick-shaped. However, Ni nanoparticle formation is apparent at higher temperature similar to 1000 degrees C, suggesting a structural transformation from a layered to a rock-salt-like structure. Combining the insitu observed changes in size and morphology, and with the premise of ensuring the morphology change from flakes to bricks, reducing the sintering temperature as much as possible to prevent excessive reduction in particle size and layered to a rock-salt structure transformation is recommended for prepare ideal NMC particles. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
Keyword :
High temperature imaging High temperature imaging Particle morphology Particle morphology Lithium-ion battery Lithium-ion battery NMC cathode NMC cathode In situ SEM In situ SEM
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GB/T 7714 | Tang, Liang , Cheng, Xiaopeng , Wu, Rui et al. Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM [J]. | JOURNAL OF ENERGY CHEMISTRY , 2022 , 66 : 9-15 . |
MLA | Tang, Liang et al. "Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM" . | JOURNAL OF ENERGY CHEMISTRY 66 (2022) : 9-15 . |
APA | Tang, Liang , Cheng, Xiaopeng , Wu, Rui , Cao, Tianci , Lu, Junxia , Zhang, Yuefei et al. Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM . | JOURNAL OF ENERGY CHEMISTRY , 2022 , 66 , 9-15 . |
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Although the rapid development of electrical energy storage devices has slowed down environmental pollution, their large-scale application has posed huge challenges to battery-related mineral resources; thus, extending the lifespan of high-voltage lithium cobalt oxide (LCO) is of great importance. Surface oxide coating is considered as the most common low-cost modification method for addressing unstable cycling performance. However, studies have shown that the oxide layer would further react with an electrolyte, while the investigation on the corresponding component evolution is lacking. Herein, a typical example utilizing the above reaction to realize surface reconstruction is presented. Applying atomic layer deposition (ALD), originally, an ultrathin Al2O3 layer is coated on the LCO surface; however, this coating layer has undergone reconstruction after reacting with electrolyte decomposition products during the cycling. Compared with simple coating, the in situ formed Li3AlF6 layer has a tighter binding to the LCO surface while possessing good Li+ conductivity and electrochemical stability. In addition, the unique properties of the ALD technology allow us to achieve ultrathin (1 nm) and conformal coating, which is beneficial for electronic conductivity and cycling stability. Furthermore, the surface phase transition layer stripping failure mechanism has first been revealed to explain the loss of Co and O, while the reconstructed Li3AlF6 effectively suppresses the surface stripping. Thus, excellent high-voltage performance has been realized (an 89% capacity retention after 1000 cycles at 4.5 V and an 88% capacity retention after 200 cycles at 4.6 V). This work casts a new understanding on the surface reconstruction of the oxide coating layer, which is also significant for other electrode materials' modification.
Keyword :
atomic layer deposition atomic layer deposition Li3AlF6 Li3AlF6 surface reconstruction surface reconstruction surface stripping surface stripping high-voltage LCO high-voltage LCO
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GB/T 7714 | Wu, Rui , Cao, Tianci , Liu, Huan et al. Ultralong Lifespan for High-Voltage LiCoO2 Enabled by In Situ Reconstruction of an Atomic Layer Deposition Coating Layer [J]. | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (22) : 25524-25533 . |
MLA | Wu, Rui et al. "Ultralong Lifespan for High-Voltage LiCoO2 Enabled by In Situ Reconstruction of an Atomic Layer Deposition Coating Layer" . | ACS APPLIED MATERIALS & INTERFACES 14 . 22 (2022) : 25524-25533 . |
APA | Wu, Rui , Cao, Tianci , Liu, Huan , Cheng, Xiaopeng , Liu, Xianqiang , Zhang, Yuefei . Ultralong Lifespan for High-Voltage LiCoO2 Enabled by In Situ Reconstruction of an Atomic Layer Deposition Coating Layer . | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (22) , 25524-25533 . |
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Abstract :
本文在密切关注新兴增材制造技术所产生的微观结构组织特征的同时,具体选取一种3D打印Ti-6Al-4V合金,分析其中的伯氏取向差结构。利用扫描电镜(SEM)、电子背散射衍射(EBSD)和统计性的五参数法,首先标定了合金结构中大量存在的α/α晶界,其次统计了α/α晶界的惯习面分布状况,之后对5种伯氏取向差分别进行了晶面取向织构分析,最后对5种伯氏取向差进行了晶界面理论结构计算。本文提出了α/α晶界识别判据并继而实现了在α/α晶界上进行伯氏取向差的准确表征,因而从具体观测技术层面发展了特定晶界的提取技术和典型取向差的结构分析技术。
Keyword :
3D打印钛合金 3D打印钛合金 观测技术 观测技术 扫描电子显微镜 扫描电子显微镜 伯氏取向差 伯氏取向差 电子背散射衍射 电子背散射衍射
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GB/T 7714 | 原效坤 , 张跃飞 , 吉元 et al. 3D打印钛合金晶界中的伯氏取向差观测方法 [J]. | 电子显微学报 , 2022 , 41 (01) : 32-39 . |
MLA | 原效坤 et al. "3D打印钛合金晶界中的伯氏取向差观测方法" . | 电子显微学报 41 . 01 (2022) : 32-39 . |
APA | 原效坤 , 张跃飞 , 吉元 , 魏崇斌 . 3D打印钛合金晶界中的伯氏取向差观测方法 . | 电子显微学报 , 2022 , 41 (01) , 32-39 . |
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Abstract :
The growth of plasma electrolytic oxidation (PEO) coating at initial stages is relevant directly with coating's morphologies and properties. In this work, the PEO coating on Al was carried out at a constant current model in an electrolyte containing sodium silicate and potassium hydroxide. The morphology, the phase compositions and the structures of initial stages PEO coatings were examined by detailed microstructural characterization. The result showed the PEO coating anodizing <11 s exhibited typical characteristics of the parallel-sided pores and the concave Al/coating boundary, with a significant temperature rising. After that, the dielectric breakdown occurred, resulting in many micron-size pores formed in the PEO coating. When anodizing time over 15 s, the gas discharge appeared at the coating/electrolyte interface. A plasma-modified layer was found composed of gamma-Al2O3 nanoparticles and amorphous materials covering the coating surface to prevent the coating from being breakdown by electrons in the plasma. After 10 min, the PEO coating transforms into the typical porous ceramic PEO coating. This study is helpful in the design of the new functional surface of the PEO coating, as well as the deep understand of the coating growth mechanism.
Keyword :
TEM TEM Aluminum Aluminum Growth mechanism Growth mechanism Anodic films Anodic films Plasma electrolytic oxidation Plasma electrolytic oxidation
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GB/T 7714 | Zhu, Lujun , Ke, Xiaoxing , Li, Jingwei et al. Growth mechanisms for initial stages of plasma electrolytic oxidation coating on Al [J]. | SURFACES AND INTERFACES , 2021 , 25 . |
MLA | Zhu, Lujun et al. "Growth mechanisms for initial stages of plasma electrolytic oxidation coating on Al" . | SURFACES AND INTERFACES 25 (2021) . |
APA | Zhu, Lujun , Ke, Xiaoxing , Li, Jingwei , Zhang, Yuefei , Zhang, Zhenhua , Sui, Manling . Growth mechanisms for initial stages of plasma electrolytic oxidation coating on Al . | SURFACES AND INTERFACES , 2021 , 25 . |
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Abstract :
Ti-6Al-4V合金表面超声振动滚压强化研究
Keyword :
粗糙度参数 粗糙度参数 显微硬度 显微硬度 残余应力 残余应力 超声振动滚压 超声振动滚压 TI-6AL-4V TI-6AL-4V 微观结构 微观结构
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GB/T 7714 | 席刚 , 刘元铭 , 张跃飞 et al. Ti-6Al-4V合金表面超声振动滚压强化研究 [J]. | 席刚 , 2021 , 29 (1) : 91-96 . |
MLA | 席刚 et al. "Ti-6Al-4V合金表面超声振动滚压强化研究" . | 席刚 29 . 1 (2021) : 91-96 . |
APA | 席刚 , 刘元铭 , 张跃飞 , 刘燕萍 , 材料科学与工艺 . Ti-6Al-4V合金表面超声振动滚压强化研究 . | 席刚 , 2021 , 29 (1) , 91-96 . |
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Abstract :
The stability and Shilnikov-type multi-pulse jumping chaotic vibrations are investigated for a nonlinear rotor-active magnetic bearing (AMB) system with the time varying stiffness and 16-pole legs under the mechanical-electric-electromagnetic excitations. The ordinary differential governing equation of motion for the rotor-AMB system is given by a two-degree-of-freedom nonlinear dynamical system including the parametric excitation, quadratic and cubic nonlinearities. The averaged equations of the rotor-AMB system are obtained by using the method of multiple scales under the cases of 1:1 internal resonance, primary parametric resonance and 1/2 subharmonic resonance. Some coordinate transformations are employed to find the type and number of the equilibrium points for the averaged equations. Using the global perturbation method developed by Kavacic and Wiggins, the explicit sufficient conditions near the resonance are obtained for the existence of the Shilnikov-type multi-pulse jumping homoclinic orbits and chaotic vibrations. This implies that the Shilnikov-type multi-pulse jumping chaotic vibrations may occur for the rotor-AMB system in the sense of Smale horseshoes. Numerical simulations are presented to verify the analytical predictions by using the fourth-order Runge-Kutta method. The Shilnikov-type multi-pulse jumping chaotic vibrations can exist in the rotor-AMB system with the time varying stiffness and 16-pole legs under the mechanical-electric-magnetic excitations. © 2020 Elsevier Masson SAS
Keyword :
Nonlinear dynamical systems Nonlinear dynamical systems Runge Kutta methods Runge Kutta methods Degrees of freedom (mechanics) Degrees of freedom (mechanics) Stiffness Stiffness Control nonlinearities Control nonlinearities Dynamical systems Dynamical systems System stability System stability Magnetic bearings Magnetic bearings Perturbation techniques Perturbation techniques Numerical methods Numerical methods Vibrations (mechanical) Vibrations (mechanical) Resonance Resonance Nonlinear equations Nonlinear equations Equations of motion Equations of motion
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GB/T 7714 | Ma, W.S. , Zhang, W. , Zhang, Y.F. . Stability and multi-pulse jumping chaotic vibrations of a rotor-active magnetic bearing system with 16-pole legs under mechanical-electric-electromagnetic excitations [J]. | Solids , 2021 , 85 . |
MLA | Ma, W.S. et al. "Stability and multi-pulse jumping chaotic vibrations of a rotor-active magnetic bearing system with 16-pole legs under mechanical-electric-electromagnetic excitations" . | Solids 85 (2021) . |
APA | Ma, W.S. , Zhang, W. , Zhang, Y.F. . Stability and multi-pulse jumping chaotic vibrations of a rotor-active magnetic bearing system with 16-pole legs under mechanical-electric-electromagnetic excitations . | Solids , 2021 , 85 . |
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The occurrence conditions of the metastable chaotic vibrations are firstly studied in the bistable asymmetric composite laminated square shallow shell under the foundation excitation. The metastable chaos is observed in the vibration experiments of the bistable asymmetric composite laminated square shallow shell. Based on the dynamic model of the bistable asymmetric composite laminated square shallow shell, the critical instability condition of the zero equilibrium point is analyzed in the bistable asymmetric composite laminated square shallow shell by using Jacobian matrix and Routh-Hurwitz criterion. We perform numerical simulations based on Runge-Kutta algorithm and the vibration experiments. A sufficient condition is found for the existence of the metastable chaos in the bistable asymmetric composite laminated square shallow shell. It is found that the zero equilibrium point of the bistable asymmetric composite laminated square shallow shell is unstable when the parametric excitation exceeds a specific critical value. The numerical results verify the theoretical analyses of the metastable chaos. It is demonstrated that the increase of the parametric excitation leads to the easier occurrence of the metastable chaos through observing the characteristics of the nonlinear dynamic behaviors of the system. Moreover, the existence of the metastable chaotic vibrations is confirmed in the bistable asymmetric composite laminated square shallow shell under the foundation excitation by using the vibration experiments. The large parametric excitation subjecting to the bistable asymmetric composite laminated square shallow shell is a key factor for the existence of the metastable chaos in the bistable asymmetric composite laminated square shallow shell under the foundation excitation. © 2020 Elsevier Ltd
Keyword :
Laminated composites Laminated composites Chaos theory Chaos theory Runge Kutta methods Runge Kutta methods Laminating Laminating Foundations Foundations Jacobian matrices Jacobian matrices Shells (structures) Shells (structures)
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GB/T 7714 | Liu, T. , Zhang, W. , Wu, M.Q. et al. Metastable nonlinear vibrations: Third chaos of bistable asymmetric composite laminated square shallow shell under foundation excitation [J]. | Composite Structures , 2021 , 255 . |
MLA | Liu, T. et al. "Metastable nonlinear vibrations: Third chaos of bistable asymmetric composite laminated square shallow shell under foundation excitation" . | Composite Structures 255 (2021) . |
APA | Liu, T. , Zhang, W. , Wu, M.Q. , Zheng, Y. , Zhang, Y.F. . Metastable nonlinear vibrations: Third chaos of bistable asymmetric composite laminated square shallow shell under foundation excitation . | Composite Structures , 2021 , 255 . |
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Abstract :
It is important and necessary to understand the micro-mechanism of rhenium (Re) effect in the deformation process. The in-situ tensile experiments of Ni-Al and Ni-Al-Re model single crystal superalloys have been carried out in scanning electron microscope at 750 degrees C. It is found that Re can promote the complex stacking fault (CSF) formation, which is similar to the previous results after tensile experiments at room temperature. The micro-mechanism of Re promoting the CSF formation has been investigated by means of advanced probe-corrected scanning transmission electron microscopy and energy dispersive X-ray spectroscopy. The local high concentration of Re is observed at CSF regions after tensile experiments both at room temperature and 750 degrees C. The first principles calculation results further indicate that low concentration of Re increases CSF energy, while high concentration of Re decreases CSF energy, which is consistent with the experimental results. (C) 2020 Elsevier B.V. All rights reserved.
Keyword :
Stacking faults Stacking faults In-situ tensile experiment In-situ tensile experiment Nickel-based model single crystal superalloys Nickel-based model single crystal superalloys Micro-mechanism of Re Micro-mechanism of Re
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GB/T 7714 | Liu, Chengpeng , Zhang, Xiaona , Wang, Chongyu et al. The micro-mechanism of rhenium promoting the formation of stacking faults in the Ni-based model single crystal superalloys [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 851 . |
MLA | Liu, Chengpeng et al. "The micro-mechanism of rhenium promoting the formation of stacking faults in the Ni-based model single crystal superalloys" . | JOURNAL OF ALLOYS AND COMPOUNDS 851 (2021) . |
APA | Liu, Chengpeng , Zhang, Xiaona , Wang, Chongyu , Yu, Tao , Zhang, Yuefei , Li, Hui et al. The micro-mechanism of rhenium promoting the formation of stacking faults in the Ni-based model single crystal superalloys . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 851 . |
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