Smart Giant Magnetostriction Actuator With Self-Sensing and Thermal Compensation Capability

2000 ◽  
Author(s):  
Yoshio Yamamoto ◽  
Takaaki Makino ◽  
Hiro Matsui
Keyword(s):  
High Energy ◽  
Structure Design ◽  
High Energy Density ◽  
Quick Response ◽  
Thermal Compensation ◽  
Solenoid Coil ◽  
Novel Structure ◽  
Giant Magnetostriction ◽  
Clamping Device ◽  
Novel Applications

Abstract Recently giant magnetostriction materials have drawn a lot of attention because of their unique features which other materials, such as PZT, cannot provide. The features include outstanding magnetostriction, high energy density, high Curie temperature, and quick response. This paper presents two kinds of novel applications of giant magnetostriction materials: a compact fine positioner and a wire clamper. The former is able to achieve highly accurate positioning due to a novel structure design which substantially reduces the influence of Joule heat generated by the solenoid coil. The latter application is motivated by a great demand towards a wire-clamping device for semiconductor manufacturing, which is capable of maintaining a sufficient clamping force without fatigue.

How to efficiently utilize electrode materials in supercapattery?

2019 ◽  
Vol 12 (01) ◽  
pp. 1830005 ◽  
Author(s):  
Kunfeng Chen ◽  
Dongfeng Xue
Keyword(s):  
High Power ◽  
Electrode Material ◽  
Redox Reaction ◽  
Electrode Materials ◽  
High Efficiency ◽  
Storage System ◽  
High Energy ◽  
Structure Design ◽  
High Energy Density ◽  
Charging Time

Theoretical stored capacity of one electrode material is decided by their thermodynamics factors, which can be achieved only when electrode materials fully react at quite long charging time. In order to store large quantities of charges in short charging time, high-efficiency utilization of electrode materials becomes more and more important. Both fast ionic and electronic transports represent the fundamental factor for high-efficiency utilization of electrode materials. Supercapattery, showing both high power density and high energy density, includes supercapattery-type electrode materials, leading to fast redox reaction. This paper focuses on the structure design of supercapattery-type electrode materials and electrode to satisfy dynamic demand for fast redox reaction of one electrode material. The use of redox active cations and the construction of active colloidal supercapatteries are described. This work will give enlightenment to design electrochemical energy storage system for high-power and high energy applications.

scholarly journals A Bifunctional-Modulated Conformal Li/Mn-Rich Layered Cathode for Fast-Charging, High Volumetric Density and Durable Li-Ion Full Cells

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Zedong Zhao ◽  
Minqiang Sun ◽  
Tianqi Wu ◽  
Jiajia Zhang ◽  
Peng Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Hollow Microsphere ◽  
Lithium Ion ◽  
High Energy ◽  
Structure Design ◽  
High Energy Density ◽  
Great Promise ◽  
Energy Devices ◽  
Tap Density

AbstractLithium- and manganese-rich (LMR) layered cathode materials hold the great promise in designing the next-generation high energy density lithium ion batteries. However, due to the severe surface phase transformation and structure collapse, stabilizing LMR to suppress capacity fade has been a critical challenge. Here, a bifunctional strategy that integrates the advantages of surface modification and structural design is proposed to address the above issues. A model compound Li1.2Mn0.54Ni0.13Co0.13O2 (MNC) with semi-hollow microsphere structure is synthesized, of which the surface is modified by surface-treated layer and graphene/carbon nanotube dual layers. The unique structure design enabled high tap density (2.1 g cm−3) and bidirectional ion diffusion pathways. The dual surface coatings covalent bonded with MNC via C-O-M linkage greatly improves charge transfer efficiency and mitigates electrode degradation. Owing to the synergistic effect, the obtained MNC cathode is highly conformal with durable structure integrity, exhibiting high volumetric energy density (2234 Wh L−1) and predominant capacitive behavior. The assembled full cell, with nanographite as the anode, reveals an energy density of 526.5 Wh kg−1, good rate performance (70.3% retention at 20 C) and long cycle life (1000 cycles). The strategy presented in this work may shed light on designing other high-performance energy devices.

scholarly journals Bulk Fatigue Induced by Surface Reconstruction in Layered Ni-Rich Oxide Cathodes for Liion Batteries

2020 ◽  
Author(s):  
Chao Xu ◽  
Katharina Marker ◽  
Juhan Lee ◽  
Amoghavarsha Mahadevegowda ◽  
Philip J. Reeves ◽  
...  
Keyword(s):  
Degradation Mechanism ◽  
Underlying Mechanism ◽  
High Energy ◽  
High Energy Density ◽  
Ex Situ ◽  
Novel Structure ◽  
Long Duration ◽  
Layered Cathode Materials ◽  
Li Ion ◽  
Reconstructed Surface

<div><div><div><p>Ni-rich layered cathode materials are among the most promising candidates for high energy density Li-ion batteries. However, the low cobalt containing materials suffer from rapid degradation, the underlying mechanism of which is still poorly understood. We herein report a novel structure-drive degradation mechanism for the NMC811(LiNi0.8Mn0.1Co0.1O2) cathode, in which a proportion of the material exhibits a lowered accessible state-of-charge (SoC) at the end of charge after repetitive cycling, i.e. becomes fatigued. Ex-situ and operando long- duration high-resolution X-ray diffraction enabled by a laser-thinned coin cell design clearly shows the emergence of the fatigued phase and the increase in its population as the cycling progresses. We show that the fatigue degradation is a structure-driven process rather than originating solely due to kinetic limitations or inter-granular cracking. No bulk phase transformations or increase in Li/Ni antisite mixing were observed by diffraction; no significant change in the local structure or Li-ion mobility of the bulk were observed by 7Li solid-state NMR spectroscopy. Instead, we propose that the fatigue process is a result of the high interfacial lattice strain between the reconstructed surface and the bulk layered structure when the latter is at SoCs above a distinct threshold of ~75 %. This mechanism is expected to be universal to Ni-rich layer cathodes, and our findings provide a fundamental guide for designing effective approaches to mitigate such deleterious processes.</p></div></div></div>

Layered-tunnel structured cathode for high performance sodium-ion batteries

2020 ◽  
Vol 13 (04) ◽  
pp. 2051016 ◽  
Author(s):  
Feng Zan ◽  
Yao Yao ◽  
Serguei V. Savilov ◽  
Eugenia Suslova ◽  
Hui Xia
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
High Energy ◽  
Structure Design ◽  
Sodium Ion ◽  
High Rate ◽  
High Energy Density ◽  
Diffraction Field ◽  
Sodium Ion Batteries

Sodium-ion batteries (SIBs) are promising candidates for large-scale energy storage applications. High-performance cathode material with high-energy density and long cycle life is of great interest. Here, an F-doped Nax[Formula: see text]Fy with layered-tunnel intergrowth structure is synthesized by a facile solid-state reaction method. The microstructure and composition of prepared material was confirmed by X-ray diffraction, field emission scanning electron microscope and transmission electron microscopy. The aim of the structure design is to combine the complementary features of high capacity from P2 phase and excellent structural stability from tunnel phase, as well as to improve rate performance by F doping. When investigated as high-rate and long-life cathode materials for Na-ion batteries, the layered-tunnel intergrowth structure exhibits synergistic effect including high discharge capacity (194.0[Formula: see text]mAh[Formula: see text][Formula: see text]), good rate capability (86[Formula: see text]mAh[Formula: see text][Formula: see text] at 15 C) as well as good cycling stability (81.2% capacity retention after 100 cycles). The as-prepared layered-tunnel intergrowth Nax[Formula: see text]Fy provides new insight into the development of intergrowth electrode materials and their application in rechargeable SIBs.

Achieving high energy density and discharge efficiency in multi-layered PVDF–PMMA nanocomposites composed of 0D BaTiO3 and 1D NaNbO3@SiO2

2020 ◽  
Vol 8 (21) ◽  
pp. 7211-7220 ◽  
Author(s):  
Qinzhao Sun ◽  
Jiping Wang ◽  
Lixue Zhang ◽  
Pu Mao ◽  
Shujuan Liu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
High Energy ◽  
Structure Design ◽  
High Energy Density ◽  
Energy Storage Properties ◽  
Discharge Efficiency ◽  
Storage Properties

The choice of dielectric fillers and structure design play an important role in improving the energy storage properties of polymer-based nanocomposites.

scholarly journals Bulk Fatigue Induced by Surface Reconstruction in Layered Ni-Rich Oxide Cathodes for Liion Batteries

2020 ◽  
Author(s):  
Chao Xu ◽  
Katharina Marker ◽  
Juhan Lee ◽  
Amoghavarsha Mahadevegowda ◽  
Philip J. Reeves ◽  
...  
Keyword(s):  
Degradation Mechanism ◽  
Underlying Mechanism ◽  
High Energy ◽  
High Energy Density ◽  
Ex Situ ◽  
Novel Structure ◽  
Long Duration ◽  
Layered Cathode Materials ◽  
Li Ion ◽  
Reconstructed Surface

<div><div><div><p>Ni-rich layered cathode materials are among the most promising candidates for high energy density Li-ion batteries. However, the low cobalt containing materials suffer from rapid degradation, the underlying mechanism of which is still poorly understood. We herein report a novel structure-drive degradation mechanism for the NMC811(LiNi0.8Mn0.1Co0.1O2) cathode, in which a proportion of the material exhibits a lowered accessible state-of-charge (SoC) at the end of charge after repetitive cycling, i.e. becomes fatigued. Ex-situ and operando long- duration high-resolution X-ray diffraction enabled by a laser-thinned coin cell design clearly shows the emergence of the fatigued phase and the increase in its population as the cycling progresses. We show that the fatigue degradation is a structure-driven process rather than originating solely due to kinetic limitations or inter-granular cracking. No bulk phase transformations or increase in Li/Ni antisite mixing were observed by diffraction; no significant change in the local structure or Li-ion mobility of the bulk were observed by 7Li solid-state NMR spectroscopy. Instead, we propose that the fatigue process is a result of the high interfacial lattice strain between the reconstructed surface and the bulk layered structure when the latter is at SoCs above a distinct threshold of ~75 %. This mechanism is expected to be universal to Ni-rich layer cathodes, and our findings provide a fundamental guide for designing effective approaches to mitigate such deleterious processes.</p></div></div></div>

Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler

TAPPI Journal ◽  
2010 ◽  
Vol 9 (6) ◽  
pp. 24-30 ◽  
Author(s):  
NIKLAS BERGLIN ◽  
PER TOMANI ◽  
HASSAN SALMAN ◽  
SOLVIE HERSTAD SVÄRD ◽  
LARS-ERIK ÅMAND
Keyword(s):  
Circulating Fluidized Bed ◽  
Black Liquor ◽  
Chloride Content ◽  
Pilot Scale ◽  
High Energy ◽  
Kraft Lignin ◽  
High Energy Density ◽  
Alkali Chloride ◽  
Cfb Boiler ◽  
Solid Biofuel

Processes have been developed to produce a solid biofuel with high energy density and low ash content from kraft lignin precipitated from black liquor. Pilot-scale tests of the lignin biofuel were carried out with a 150 kW powder burner and a 12 MW circulating fluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the air flows to reduce swirl. Lignin dried to 10% moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than did wood/bark powder. In the CFB boiler, lignin was easily handled and cofired together with bark. Although the filter cake was broken into smaller pieces and fines, the combustion was not disturbed. When cofiring lignin with bark, the sulfur emission increased compared with bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture also occurred with addition of limestone to the bed. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk.

Sign in / Sign up

Export Citation Format

Share Document